>>
4 Equipment grouping
4.1 General
4.2 Group I
4.3 Group II
4.4 Group III
4.5 Equipment for a particular explosive gas atmosphere
5 Temperatures
5.1 Environmental influences
5.1.1 Ambient temperature
5.1.2 External source of heating or cooling
5.2 Service temperature
5.3 Maximum surface temperature
5.3.1 Determination of maximum surface temperature
5.3.2 Limitation of maximum surface temperature
5.3.3 Small component temperature for Group I or Group II electrical equipment
5.3.4 Component temperature of smooth surfaces for Group I or Group II electrical equipment
6 Requirements for all equipment
6.1 General
6.2 Mechanical strength of equipment
6.3 Opening times
6.4 Circulating currents in enclosures (e.g. of large electric machines)
6.5 Gasket retention
6.6 Electromagnetic and ultrasonic energy radiating equipment
6.6.1 General
6.6.2 Radio frequency sources
6.6.3 Ultrasonic sources
6.6.4 Lasers, luminaires, and other non-divergent continuous wave optical sources
7 Non-metallic enclosures and non-metallic parts of enclosures
7.1 General
7.1.1 Applicability
7.1.2 Specification of materials
7.2 Thermal endurance
7.2.1 Tests for thermal endurance
7.2.2 Material selection
7.2.3 Alternative qualification of elastomeric sealing O-rings
7.3 Resistance to ultraviolet light
7.4 Electrostatic charges on external non-metallic materials
7.4.1 Applicability
7.4.2 Avoidance of a build-up of electrostatic charge for Group I or Group II
7.4.3 Avoidance of a build-up of electrostatic charge for Group III
7.5 Attached external conductive parts
8 Metallic enclosures and metallic parts of enclosures
8.1 Material composition
8.2 Group I
8.3 Group II
8.4 Group III
8.5 Copper Alloys
9 Fasteners
9.1 General
9.2 Special fasteners
9.3 Holes for special fasteners
9.3.1 Thread engagement
9.3.2 Tolerance and clearance
9.4 Hexagon socket set screws
10 Interlocking devices
11 Bushings
12 (Reserved for future use)
13 Ex Components
13.1 General
13.2 Mounting
13.3 Internal mounting
13.4 External mounting
13.5 Ex Component certificate
14 Connection facilities
14.1 General
14.2 Type of protection
14.3 Creepage and clearance
15 Connection facilities for earthing or bonding conductors
15.1 Equipment requiring earthing or bonding
15.1.1 Internal earthing
15.1.2 External bonding
15.2 Equipment not requiring earthing
15.3 Size of protective earthing conductor connection
15.4 Size of equipotential bonding conductor connection
15.5 Protection against corrosion
15.6 Secureness of electrical connections
15.7 Internal earth continuity plate
16 Entries into enclosures
16.1 General
16.2 Identification of entries
16.3 Cable glands
16.4 Blanking elements
16.5 Thread adapters
16.6 Temperature at branching point and entry point
16.7 Electrostatic charges of cable sheaths
17 Supplementary requirements for electric machines
17.1 General
17.2 Ventilation
17.2.1 Ventilation openings
17.2.2 Materials for external fans
17.2.3 Cooling fans of rotating electric machines
17.2.4 Auxiliary motor cooling fans
17.2.5 Room ventilating fans
17.3 Bearings
18 Supplementary requirements for switchgear
18.1 Flammable dielectric
18.2 Disconnectors
18.3 Group I – Provisions for locking
18.4 Doors and covers
19 Reserved for future use
20 Supplementary requirements for external plugs, socket outlets and connectors for field wiring connection
20.1 General
20.2 Explosive gas atmospheres
20.3 Explosive dust atmospheres
20.4 Energized plugs
21 Supplementary requirements for luminaires
21.1 General
21.2 Covers for luminaires of EPL Mb, EPL Gb, or EPL Db
21.3 Covers for luminaires of EPL Gc or EPL Dc
21.4 Sodium lamps
22 Supplementary requirements for caplights and handlights
22.1 Group I caplights
22.2 Group II and Group III caplights and handlights
23 Equipment incorporating cells and batteries
23.1 General
23.2 Interconnection of cells to form batteries
23.3 Cell types
23.4 Cells in a battery
23.5 Ratings of batteries
23.6 Interchangeability
23.7 Charging of primary batteries
23.8 Leakage
23.9 Connections
23.10 Orientation
23.11 Replacement of cells or batteries
23.12 Replaceable battery pack
24 Documentation
25 Compliance of prototype or sample with documents
26 Type tests
26.1 General
26.2 Test configuration
26.3 Tests in explosive test mixtures
26.4 Tests of enclosures
26.4.1 Order of tests
26.4.2 Resistance to impact
26.4.3 Drop test
26.4.4 Acceptance criteria
26.4.5 Degree of protection (IP) by enclosures
26.5 Thermal tests
26.5.1 Temperature measurement
26.5.2 Thermal shock test
26.5.3 Small component ignition test (Group I and Group II)
26.6 Torque test for bushings
26.6.1 Test procedure
26.6.2 Acceptance criteria
26.7 Non-metallic enclosures or non-metallic parts of enclosures
26.7.1 General
26.7.2 Test temperatures
26.8 Thermal endurance to heat
26.9 Thermal endurance to cold
26.10 Resistance to UV light
26.10.1 General
26.10.2 Light exposure
26.10.3 Acceptance criteria
26.11 Resistance to chemical agents for Group I equipment
26.12 Earth continuity
26.13 Surface resistance test of parts of enclosures of non-metallic materials
26.14 Measurement of capacitance
26.14.1 General
26.14.2 Test procedure
26.15 Verification of ratings of ventilating fans
26.16 Alternative qualification of elastomeric sealing O-rings
26.17 Transferred charge test
26.17.1 Test equipment
26.17.2 Test sample
26.17.3 Test procedure
27 Routine tests
28 Manufacturer's responsibility
28.1 Conformity with the documentation
28.2 Certificate
28.3 Responsibility for marking
29 Marking
29.1 Applicability
29.2 Location
29.3 General
29.4 Ex marking for explosive gas atmospheres
29.5 Ex marking for explosive dust atmospheres
29.6 Combined types (or levels) of protection
29.7 Multiple types of protection
29.8 Ga equipment using two independent Gb types (or levels) of protection
29.9 Boundary wall
29.10 Ex Components
29.11 Small Ex Equipment and small Ex Components
29.12 Extremely small Ex Equipment and extremely small Ex Components
29.13 Warning markings
29.14 Cells and batteries
29.15 Electric machines operated with a converter
29.16 Examples of marking
30 Instructions
30.1 General
30.2 Cells and batteries
30.3 Electric machines
30.4 Ventilating fans
30.5 Cable glands
Annex A (normative) Supplementary requirements for cable glands
Annex B (normative) Requirements for Ex Components
Annex C (informative) Example of rig for resistance to impact test
Annex D (informative) Electric machines connected to converters
Annex E (informative) Temperature evaluation of electric machines
Annex F (informative) Guidance flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)
Annex G (informative) Guidance flowchart for tests of cable glands
Annex H (informative) Shaft voltages resulting in motor bearing or shaft brush sparking Discharge energy calculation
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Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
GSO IEC 60079-0:2024
IEC 60079-0:2017
مواصفة قياسية خليجية
المعدات الكهربائية للأجواء المتفجرة - الجزء (0) : المتطلبات العامة
Gulf Standard
Explosive atmospheres - Part 0: Equipment - General requirements
ICS: |
29.260.20
|
© GCC Standardization Organization 2024 – All rights reserved
© هيئة التقييس لدول مجلس التعاون لدول الخليج العربية 2024 – جميع الحقوق محفوظة
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جميع الحقوق محفوظة لهيئة لتقييس لدول مجلس التعاون لدول الخليج العربية.
ما لم ينص على خلاف ذلك، لا يجوز إعادة إنتاج أي جزء من هذا المنشور أو استخدامه بأي شكل آخر أو بأي وسيلة، إلكترونية أو ميكانيكية، بما في ذلك التصوير، أو النشر على الإنترنت أو الإنترانت، دون إذن كتابي مسبق من هيئة التقييس لدول مجلس التعاون لدول الخليج العربية على العنوان أدناه أو الدول الأعضاء في الهيئة داخل بلدانهم.
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All rights reserved to GCC Standardization Organization (GSO). Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either GSO at the address below or GSO's member body in the country of the requester.
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Outreach Dept, Knowledge Management Section
GCC Standardization Organization (GSO)
P.O.Box: 85245 Riyadh 12511
Kingdom of Saudi Arabia
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إدارة التواصل، قسم إدارة المعرفة
هيئة التقييس لدول مجلس التعاون لدول الخليج العربية (GSO)
ص. ب: 85245 الرياض 12511
المملكة العربية السعودية
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| Tel: | +966115208000 | :هاتف | ||||||
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| Website: | www.gso.org.sa | :موقع ويب | ||||||
30mm
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Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
Gulf Foreword
GCC Standardization Organization (GSO) is a regional organization which consists of the national standardization bodies of GCC member states. One of GSO main functions is to issue gulf standards and technical regulations through specialized technical committees.
GSO Technical Council
in its meeting number (58) held
on 16/10/1445 H,
which corresponds to 25/04/2024, has approved
the update of
Gulf
Standard
GSO IEC 60079-0:2024
titled "Explosive atmospheres - Part 0: Equipment - General requirements" in
English
language
which was studied
and adopted
by endorsement
from
International Electrotechnical Commission
Standard
IEC 60079-0:2017
through
the technical program of
GSO Technical Committee for Electric Power Generation, Transmission and Distribution Equipment
(TC09)
in SAUDI ARABIA schedule
.
This document will cancel and replace the Gulf
Standard
GSO IEC 60079-0:2013.
| تقديم خليجي |
هيئة التقييس لدول مجلس التعاون لدول الخليج العربية هيئة إقليمية تضم في عضويتها أجهزة التقييس الوطنية في الدول الأعضاء ، ومن مهام الهيئة إعداد المواصفات القياسية واللوائح الفنية الخليجية بواسطة لجان فنية متخصصة.
قرر المجلس الفني
لهيئة التقييس لدول مجلس التعاون لدول الخليج العربية
في الاجتماع الـ (58)
بتاريخ 1445/10/16 هـ ،الموافق 2024/04/25م اعتماد
تحديث
المواصفة القياسية الخليجية
رقم GSO IEC 60079-0:2024
وعنوانها "المعدات الكهربائية للأجواء المتفجرة - الجزء (0) : المتطلبات العامة"
باللغة
الانجليزية
التي تم دراستها
وتبنيها
بالمصادقة
عن
اللجنة الدولية الكهروتقنية
رقم
IEC 60079-0:2017
ضمن برنامج عمل
اللجنة الفنية الخليجية لمواصفات معدات توليد ونقل وتوزيع الطاقة الكهربائية
(TC09)
المدرجة في خطة المملكة العربية السعودية
.
على أن تلغي وتحل محل
المواصفة القياسية
رقم
GSO IEC 60079-0:2013
.
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Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
| IEC 60079-0 |
INTERNATIONAL STANDARD | Edition 7.0 2017-12 | |
| Explosive atmospheres – Part 0: Equipment – General requirements | ||
30mm
20mm
15mm
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Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
 | THIS PUBLICATION IS COPYRIGHT PROTECTEDCopyright © 2017 IEC, Geneva, Switzerland |
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30mm
20mm
15mm
15mm
10mm
17mm
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
| IEC 60079-0 |
INTERNATIONAL STANDARD | Edition 7.0 2017-12 | |
| Explosive atmospheres – Part 0: Equipment – General requirements | ||
INTERNATIONAL
ELECTROTECHNCIAL
COMMISSION
ICS 29.260.20ISBN 9782832250655Warning! Make sure that you obtained this publication from an authorized distributor.© Registered trademark of the International Electrotechnical Commission
30mm
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15mm
15mm
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Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
CONTENTS
4 Equipment grouping
4.1 General
4.2 Group I
4.3 Group II
4.4 Group III
4.5 Equipment for a particular explosive gas atmosphere
5 Temperatures
5.1 Environmental influences
5.1.1 Ambient temperature
5.1.2 External source of heating or cooling
5.2 Service temperature
5.3 Maximum surface temperature
5.3.1 Determination of maximum surface temperature
5.3.2 Limitation of maximum surface temperature
5.3.3 Small component temperature for Group I or Group II electrical equipment
5.3.4 Component temperature of smooth surfaces for Group I or Group II electrical equipment
6 Requirements for all equipment
6.1 General
6.2 Mechanical strength of equipment
6.3 Opening times
6.4 Circulating currents in enclosures (e.g. of large electric machines)
6.5 Gasket retention
6.6 Electromagnetic and ultrasonic energy radiating equipment
6.6.1 General
6.6.2 Radio frequency sources
6.6.3 Ultrasonic sources
6.6.4 Lasers, luminaires, and other non-divergent continuous wave optical sources
7 Non-metallic enclosures and non-metallic parts of enclosures
7.1 General
7.1.1 Applicability
7.1.2 Specification of materials
7.2 Thermal endurance
7.2.1 Tests for thermal endurance
7.2.2 Material selection
7.2.3 Alternative qualification of elastomeric sealing O-rings
7.3 Resistance to ultraviolet light
7.4 Electrostatic charges on external non-metallic materials
7.4.1 Applicability
7.4.2 Avoidance of a build-up of electrostatic charge for Group I or Group II
7.4.3 Avoidance of a build-up of electrostatic charge for Group III
7.5 Attached external conductive parts
8 Metallic enclosures and metallic parts of enclosures
8.1 Material composition
8.2 Group I
8.3 Group II
8.4 Group III
8.5 Copper Alloys
9 Fasteners
9.1 General
9.2 Special fasteners
9.3 Holes for special fasteners
9.3.1 Thread engagement
9.3.2 Tolerance and clearance
9.4 Hexagon socket set screws
10 Interlocking devices
11 Bushings
12 (Reserved for future use)
13 Ex Components
13.1 General
13.2 Mounting
13.3 Internal mounting
13.4 External mounting
13.5 Ex Component certificate
14 Connection facilities
14.1 General
14.2 Type of protection
14.3 Creepage and clearance
15 Connection facilities for earthing or bonding conductors
15.1 Equipment requiring earthing or bonding
15.1.1 Internal earthing
15.1.2 External bonding
15.2 Equipment not requiring earthing
15.3 Size of protective earthing conductor connection
15.4 Size of equipotential bonding conductor connection
15.5 Protection against corrosion
15.6 Secureness of electrical connections
15.7 Internal earth continuity plate
16 Entries into enclosures
16.1 General
16.2 Identification of entries
16.3 Cable glands
16.4 Blanking elements
16.5 Thread adapters
16.6 Temperature at branching point and entry point
16.7 Electrostatic charges of cable sheaths
17 Supplementary requirements for electric machines
17.1 General
17.2 Ventilation
17.2.1 Ventilation openings
17.2.2 Materials for external fans
17.2.3 Cooling fans of rotating electric machines
17.2.4 Auxiliary motor cooling fans
17.2.5 Room ventilating fans
17.3 Bearings
18 Supplementary requirements for switchgear
18.1 Flammable dielectric
18.2 Disconnectors
18.3 Group I – Provisions for locking
18.4 Doors and covers
19 Reserved for future use
20 Supplementary requirements for external plugs, socket outlets and connectors for field wiring connection
20.1 General
20.2 Explosive gas atmospheres
20.3 Explosive dust atmospheres
20.4 Energized plugs
21 Supplementary requirements for luminaires
21.1 General
21.2 Covers for luminaires of EPL Mb, EPL Gb, or EPL Db
21.3 Covers for luminaires of EPL Gc or EPL Dc
21.4 Sodium lamps
22 Supplementary requirements for caplights and handlights
22.1 Group I caplights
22.2 Group II and Group III caplights and handlights
23 Equipment incorporating cells and batteries
23.1 General
23.2 Interconnection of cells to form batteries
23.3 Cell types
23.4 Cells in a battery
23.5 Ratings of batteries
23.6 Interchangeability
23.7 Charging of primary batteries
23.8 Leakage
23.9 Connections
23.10 Orientation
23.11 Replacement of cells or batteries
23.12 Replaceable battery pack
24 Documentation
25 Compliance of prototype or sample with documents
26 Type tests
26.1 General
26.2 Test configuration
26.3 Tests in explosive test mixtures
26.4 Tests of enclosures
26.4.1 Order of tests
26.4.2 Resistance to impact
26.4.3 Drop test
26.4.4 Acceptance criteria
26.4.5 Degree of protection (IP) by enclosures
26.5 Thermal tests
26.5.1 Temperature measurement
26.5.2 Thermal shock test
26.5.3 Small component ignition test (Group I and Group II)
26.6 Torque test for bushings
26.6.1 Test procedure
26.6.2 Acceptance criteria
26.7 Non-metallic enclosures or non-metallic parts of enclosures
26.7.1 General
26.7.2 Test temperatures
26.8 Thermal endurance to heat
26.9 Thermal endurance to cold
26.10 Resistance to UV light
26.10.1 General
26.10.2 Light exposure
26.10.3 Acceptance criteria
26.11 Resistance to chemical agents for Group I equipment
26.12 Earth continuity
26.13 Surface resistance test of parts of enclosures of non-metallic materials
26.14 Measurement of capacitance
26.14.1 General
26.14.2 Test procedure
26.15 Verification of ratings of ventilating fans
26.16 Alternative qualification of elastomeric sealing O-rings
26.17 Transferred charge test
26.17.1 Test equipment
26.17.2 Test sample
26.17.3 Test procedure
27 Routine tests
28 Manufacturer's responsibility
28.1 Conformity with the documentation
28.2 Certificate
28.3 Responsibility for marking
29 Marking
29.1 Applicability
29.2 Location
29.3 General
29.4 Ex marking for explosive gas atmospheres
29.5 Ex marking for explosive dust atmospheres
29.6 Combined types (or levels) of protection
29.7 Multiple types of protection
29.8 Ga equipment using two independent Gb types (or levels) of protection
29.9 Boundary wall
29.10 Ex Components
29.11 Small Ex Equipment and small Ex Components
29.12 Extremely small Ex Equipment and extremely small Ex Components
29.13 Warning markings
29.14 Cells and batteries
29.15 Electric machines operated with a converter
29.16 Examples of marking
30 Instructions
30.1 General
30.2 Cells and batteries
30.3 Electric machines
30.4 Ventilating fans
30.5 Cable glands
Annex A (normative) Supplementary requirements for cable glands
Annex B (normative) Requirements for Ex Components
Annex C (informative) Example of rig for resistance to impact test
Annex D (informative) Electric machines connected to converters
Annex E (informative) Temperature evaluation of electric machines
Annex F (informative) Guidance flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)
Annex G (informative) Guidance flowchart for tests of cable glands
Annex H (informative) Shaft voltages resulting in motor bearing or shaft brush sparking Discharge energy calculation
Explosive atmospheres - Part 0: Equipment - General requirements
FOREWORD
1)
The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2)
The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3)
IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.
4)
In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5)
IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies.
6)
All users should ensure that they have the latest edition of this publication.
7)
No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8)
Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication.
9)
Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60079‑0 has been prepared by IEC technical committee 31: Equipment for explosive atmospheres.
This seventh edition cancels and replaces the sixth edition, published in 2011. This edition constitutes a technical revision.
The significance of the changes between IEC Standard, IEC 60079‑0, Edition 6 (2011) and IEC 60079‑0, Edition 7 (2017) are as listed below:
| Type | ||||
|---|---|---|---|---|
| Explanation of the significance of the changes | Clause | Minor and editorial changes | Extension | Major technical changes |
| Throughout document, “electrical equipment” replaced by “equipment” where appropriate. | Multiple | X | ||
| Scope
List of “Type of “Protection” and “Product” standards combined into one list. |
1 | X | ||
| Definitions used in multiple sub-parts added.
Definitions harmonized across sub-parts and added to 60079-0 where appropriate.
Battery definitions updated |
3 | X | ||
| Clarification of the way that information on process temperature influences can be expressed. | 5.1.2 | X | ||
| Clarification regarding the determination of service temperatures when dust layers are present | 5.2 | X | ||
| Clarification on the need to provide service temperature information for Ex Components in the Schedule of Limitations | 5.2 | X | ||
| Relocation of EPL Da dust layer requirements from IEC 60079‑18 & IEC 60079‑31 | 5.3.2.3.1 | A1 | ||
| Clarified that for EPL Db, a maximum specified dust layer of greater than 200 mm is not permitted as thicker layers have no additional effect on maximum surface temperature. | b) | X | ||
| Added for EPL Db, a dust layer in a specified orientation, marked as TL | c) | X | ||
| Clarified that for EPL Dc, no dust layer tests are required. | 5.3.2.3.3 | X | ||
| Clarified that the “temperature” is the temperature of the air surrounding the component | 5.3.3 | X | ||
| Subdivided section dealing with higher permitted surface temperatures for “smooth” surfaces. Corrected area from 1 000 mm2 to 10 000 mm2. | 5.3.4 | X | ||
| Clarified that the “Ex” requirements of IEC 60079 supplement those of the relevant industrial standards. | 6.1 | X | ||
| Added requirement that where an adhesive is used to secure a gasket, it shall be used within its COT and shall comply with the requirements for cements. | 6.5 | C1 | ||
| Requirements relocated to IEC 60079‑28 | former 6.6.2 | A2 | ||
| Ultrasonic requirements updated based on latest research work | 6.6.3 | X | ||
| Added reference to IEC 60079‑28 | 6.6.4 | A2 | ||
| Material identification parameters have been revised to reflect reasonably obtainable information | 7.1.2.2 | X | ||
| “RTI-mechanical” has been clarified to include “RTI-mechanical strength” and “RTI-mechanical impact” | 7.1.2.2 | X | ||
| Material identification parameters have been revised to reflect reasonably obtainable information | 7.1.2.3 | X | ||
| Relocated information on “cements” from Clause 12. | 7.1.2.4 | X | ||
| “RTI-mechanical” has been clarified to include “RTI-mechanical strength” and “RTI-mechanical impact”. Requirements for cements aligned with the requirements for elastomers. | 7.2.2 | X | ||
| Relocation of 10 K margin for EPL Gc or Dc from IEC 60079‑15, IEC 60079‑18 & IEC 60079‑31 | 7.2.2 | A3 | ||
| Added clarification with respect to gaskets and seals where only the outer edge is potentially exposed to light. | 7.3 | X | ||
| Clarification added that one or more of the described techniques may be used | 7.4.2 | X | ||
| Added additional relaxation for the case where a surface is in contact with an earthed surface on only two of four sides. | 7.4.2 b) | X | ||
| Added reference to IEC 60243‑1 and IEC 60243‑2 for test method to require a 4 kV DC test.. | 7.4.2.c) | C2 | ||
| Additional guidance added with respect to the possible Specific Conditions of Use | 7.4.2 e) | X | ||
| New option added for portable, mains-powered equipment with earth-connected guard | 7.4.2 f) | X | ||
| Added option for determination of maximum transferred charge. | 7.4.2 g) Table 10 | X | ||
| Added missing limits (same as 7.4.2) | 7.4.3 a) | X | ||
| Clarified that it is a dc test that is conducted | 7.4.3 b) | X | ||
| Clarified that this requirement is not applied to personal or portable equipment | 7.5 | X | ||
| Clarified Group I limits | 8.2 | X | ||
| Clarified Group II, EPL Ga limits | 8.3 | X | ||
| Added limitation for external surfaces of >65% copper | 8.5 | C3 | ||
| Added clarification as to what is considered a tool | 9.1 | X | ||
| Clarified that the tolerance class of the set screw is not critical, only that it not protrude from the threaded hole after tightening. | 9.4 | X | ||
| Information on cements transferred to Clause 7 | 12 | X | ||
| Required that Ex Component Certificates require a Schedule of Limitations in all cases | 13.5 | X | ||
| Revised to clarified that all connection facilities may not be a “Compartment”. | 14 | X | ||
| Sub-clause split to separate the requirements for protective earthing and equipotential bonding into separate sections | 15.3 15.4 | X | ||
| Section split to separate secureness of electrical connections from the internal earth continuity plate. | 15.6 15.7 | X | ||
| Non-threaded Group I cable glands are no longer required to be Ex Components. | 16.3 | X | ||
| Non-threaded Group I blanking elements are no longer required to be Ex Components. | 16.4 | X | ||
| Scope of Clause 17 clarified to define applicability | 17 | X | ||
| Additional guidance notes added to address bearings | 17.3 | X | ||
| Clarified applicability to disconnectors, interlocks, and maintenance switches. | 18.2 | X | ||
| Fuse requirements deleted as they are addressed in the individual sub-parts | 19 | X | ||
| Added requirements for EPL Gc and Dc | 20.1 | C4 | ||
| The test circuit requirements for a flameproof connection have been removed as they are more completely specified in IEC 60079‑1. | 20.2 | X | ||
| The impact test requirements for luminaires are relocated to Table 15 | 21.1 Table 15 | X | ||
| Clarified interlock switch operation for flameproof luminaires | 21.2 | X | ||
| Clarified that some Types of Protection permit connection of cells in parallel | 23.2 | X | ||
| New cell types and data added based on latest available data | Table 13 | X | ||
| New cell types and data added based on latest available data | Table 14 | C5 | ||
| Clarification of what documentation is to be prepared regarding the explosion safety aspects of the equipment | 24 | X | ||
| Clarification that the type tests are to take into consideration the installation instructions | 26.2 | X | ||
| Clarification that the “glass” requirements also apply to “ceramic” parts | 26.4.1.1 | X | ||
| Added a permission to interchange the order of tests at the “lower test temperature” and the “upper test temperature”. | 26.4.1.2.2 26.4.1.2.3 | X | ||
| Clarified the construction of the impact test fixture | 26.4.2 | X | ||
| Clarified the impact tests for glass parts | 26.4.2 | X | ||
| Added clarification to deal with the new IPX9 ratings | 26.4.5.1 | X | ||
| Clarified the test voltage for maximum surface temperature | 26.5.1.3 | X | ||
| Relocation of EPL Da dust layer requirements from IEC 60079‑18 & IEC 60079‑31 | 26.5.1.3 | A1 | ||
| Relocation of EPL Db specified dust layer requirements from IEC 60079‑31 | 26.5.1.3 | A4 | ||
| Added for EPL Db, a dust layer in a specified orientation, marked as TL | 26.5.1.3 | B1 | ||
| Clarified that for EPL Dc, the testing is conducted without a dust layer. | 26.5.1.3 | X | ||
| Relocation of thermal endurance to heat 10K relaxation for Gc equipment from IEC 60079‑15, IEC 60079‑18, & IEC 60079‑31 | Table 17 | X | ||
| Clarification of a consistent way to address elastomeric materials exposed to ultraviolet light | 26.10 | X | ||
| Replacement of “oil No. 2” with the revised designation of “oil IRM 902”. | 26.11 | X | ||
| Option added for testing at lower voltages when low resistance materials are encountered | 26.13 | X | ||
| Transferred charge test added based on IEC TS 60079‑32‑2 | 26.17 | X | ||
| The reference to a specific instruction document instead of an “X” condition relocated to e) instead of a note giving a permission | 29.3 e) | X | ||
| Updated to reflect the additional levels of protection already shown in the sub-parts: “da”, “dc”, “eb”, “ec”, “oc”, “op is”, “op pr”, “op sh”, “pxb”, “pyb”, “pzc”, “qb”, “sa”, “sb”, and “sc”. | 29.4 b) | X | ||
| Text added to address marking of “Ex associated equipment” | 29.4 | X | ||
| Updated to reflect the additional levels of protection already shown in the sub-parts: “ic”, “op is”, “op pr”, “op sh”, “pxb”, “pyb”, “pzc”, “sa”, “sb”, and “sc”. | 29.5 b) | X | ||
| Clarified marking of EPL Da, EPL Db with no dust layer, EPL Db with a specified dust layer, and EPL Dc. | 29.5 d) | X | ||
| Introduced marking for EPL Db with a dust layer in a specified orientation | 29.5 d) | X | ||
| Text added to address marking of “Ex associated equipment” | 29.5 | X | ||
| Text added to address marking of equipment intended to be installed in a boundary wall. | 29.9 | X | ||
| The marking of Ex Component enclosure was aligned with the marking requirements of IEC 60079‑1 and IEC 60079‑7 | 29.10 | X | ||
| The alternate marking of EPL has been deleted. | former 29.13 | C6 | ||
| Marking for electric machines operated with a converter clarified | 29.15 | X | ||
| Instruction material guidance clarified | 30.1 | X | ||
| Additional instruction material for electric machines added | 30.3 | C7 | ||
| Additional instruction material for cable glands added | 30.5 A.5 | C8 | ||
| Allow ISO 10807 hose assemblies to be used with cable glands. | A.1 | X | ||
| Clarify testing with stainless steel mandrels | A.3 | X | ||
| Reduction of the time / slippage permitted | A.3.1.1 | X | ||
| Clarify impact testing of cable glands | A.3.3 Figure A.3 | X | ||
| Clarified the order of tests | A.3.4 | X | ||
| Clarified remarks | Annex B | X | ||
| Aligned Figure with text | Figure C.1 | X | ||
| Clarified operation of electric machines from converters | Annex D (informative) | X | ||
| Clarified temperature testing of electric machines | Annex E (informative) | X | ||
| Flowchart for Cable Gland testing | Annex G (informative) | X | ||
| Guidance of electric machine shaft voltages | Annex H (informative) | X | ||
NOTEThe technical changes referred to include the significance of technical changes in the revised IEC Standard, but they do not form an exhaustive list of all modifications from the previous version. More guidance may be found by referring to the Redline Version of the standard.
Explanations:
A)
Definitions
| Minor and editorial changes | clarification |
| decrease of technical requirements | |
| minor technical change | |
| editorial corrections |
These are changes which modify requirements in an editorial or a minor technical way. They include changes of the wording to clarify technical requirements without any technical change, or a reduction in level of existing requirement.
| Extension | addition of technical options |
These are changes which add new or modify existing technical requirements, in a way that new options are given, but without increasing requirements for equipment that was fully compliant with the previous standard. Therefore, these will not have to be considered for products in conformity with the preceding edition.
| Major technical changes | addition of technical requirements |
| increase of technical requirements |
These are changes to technical requirements (addition, increase of the level or removal) made in a way that a product in conformity with the preceding edition will not always be able to fulfil the requirements given in the later edition. These changes have to be considered for products in conformity with the preceding edition. For these changes additional information is provided in clause B) below.
NOTEThese changes represent current technological knowledge. However, these changes should not normally have an influence on equipment already placed on the market.
B)
Information about the background of changes
| A1 | The dust layer requirements for EPL Da are unchanged from what previously existed in IEC 60079‑18, Ed 4 and IEC 60079‑31, Ed 2, but have been relocated to IEC 60079‑0 to allow consistent application in all Types of Protection. |
| A2 | IEC 60079‑28 now includes all requirements for optical radiation for all EPLs. |
| A3 | The COT requirements for EPL Gc or Dc are unchanged from what previously existed in IEC 60079‑15, Ed 4, IEC 60079‑18, Ed 4, and IEC 60079‑31, Ed 2, but have been relocated to IEC 60079‑0 to allow consistent application in all Types of Protection. |
| A4 | The dust layer requirements for EPL Db with a specified dust layer depth are unchanged from what previously existed in IEC 60079‑31, Ed 2, but have been relocated to IEC 60079‑0 to allow consistent application in all Types of Protection. |
| B1 | Dust layer requirements for EPL Db with a dust layer in a specified orientation have been added. |
| C1 | It is recognized that the new requirements were, in many cases, already applied. The change is to ensure that they are uniformly and consistently applied. |
| C2 | Require that the test be conducted at 4 kV DC. |
| C3 | The limitation applies to external surfaces of other than cable glands, blanking elements, thread adapters and bushings. |
| C4 | The added requirements for tool securing and marking are consistent with the approach in IEC 60079‑15 |
| C5 | Voltage values were changed following additional research due to the complicated assessment and sometimes unspecified construction of Li/Ion-cells. It was found that some voltage values previously stated were too low. |
| C6 | The now required EPL marking may be other than that permitted by the Level of Protection to account for limiting restrictions of material or plastic material surface area. |
| C7 | Additional instruction material for electric machines required to facilitate selection, installation, and maintenance. |
| C8 | Additional instruction material for cable glands required to facilitate selection and installation. |
The text of this International Standard is based on the following documents:
| FDIS | Report on voting |
| 31/1345/FDIS | 31/1356/RVD |
Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60079 series, under the general title Explosive atmospheres, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific document. At this date, the document will be
•
reconfirmed,
•
withdrawn,
•
replaced by a revised edition, or
•
amended.
30mm
20mm
15mm
15mm
10mm
17mm
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
1Scope
This part of IEC 60079 specifies the general requirements for construction, testing and marking of Ex Equipment and Ex Components intended for use in explosive atmospheres.
The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that Ex Equipment can be operated are:
•
temperature –20 °C to +60 °C;
•
pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and
•
air with normal oxygen content, typically 21 % v/v.
This part of IEC 60079 and other standards supplementing this standard specify additional test requirements for Ex Equipment operating outside the standard temperature range, but further additional consideration and additional testing may be required for Ex Equipment operating outside the standard atmospheric pressure range and standard oxygen content. Such additional testing may be particularly relevant with respect to Types of Protection that depend on quenching of a flame such as ‘flameproof enclosures “d”’ (IEC 60079‑1) or limitation of energy, ‘intrinsic safety “i”’ (IEC 60079‑11).
NOTE 1Although the standard atmospheric conditions above give a temperature range for the atmosphere of −20 °C to +60 °C, the normal ambient temperature range for the Ex Equipment is –20 °C to +40 °C, unless otherwise specified and marked. See 5.1.1. It is considered that –20 °C to +40 °C is appropriate for many items of Ex Equipment and that to manufacture all Ex Equipment to be suitable for a standard atmosphere upper ambient temperature of +60 °C would place unnecessary design constraints.
NOTE 2Requirements given in this standard result from an ignition hazard assessment made on equipment. The ignition sources taken into account are those found associated with this type of equipment, such as hot surfaces, electromagnetic radiation, mechanically generated sparks, mechanical impacts resulting in thermite reactions, electrical arcing and static electric discharge in normal industrial environments.
NOTE 3Where an explosive gas atmosphere and a combustible dust atmosphere are, or can be, present at the same time, the simultaneous presence of both often warrants additional protective measures. Additional guidance on the use of Ex Equipment in hybrid mixtures (mixture of a flammable gas or vapour with a combustible dust or combustible flyings) is given in IEC 60079‑14.
IEC 60079 does not specify requirements for safety, other than those directly related to the explosion risk.
Ignition sources like adiabatic compression, shock waves, exothermic chemical reaction, self-ignition of dust, naked flames and hot gases/liquids, are not addressed by this standard.
NOTE 4Although outside the scope of this standard, such equipment would typically be subjected to a hazard analysis that identifies and lists all of the potential sources of ignition by the equipment and the measures to be applied to prevent them becoming effective. See ISO/IEC 80079‑36.
This document is supplemented or modified by the following parts and technical specifications:
–
IEC 60079‑1: Gas – Flameproof enclosures "d";
–
IEC 60079‑2: Gas and dust – Pressurized enclosure "p";
–
IEC 60079‑5: Gas – Powder filling "q";
–
IEC 60079‑6: Gas – Liquid immersion "o";
–
IEC 60079‑7: Gas – Increased safety "e";
–
IEC 60079‑11: Gas and dust – Intrinsic safety "i";
–
IEC 60079‑13: Gas and dust – Equipment protection by pressurized room “p” & artificially ventilated room “v”;
–
IEC 60079‑15: Gas – Type of protection “n”;
–
IEC 60079‑18: Gas and dust – Encapsulation "m";
–
IEC 60079‑25: Gas and dust – Intrinsically safe electrical systems
–
IEC 60079‑26: Gas – Equipment with equipment protection level (EPL) Ga
–
IEC 60079‑28: Gas and dust – Protection of equipment and transmission systems using optical radiation
–
IEC 60079‑29‑1: Gas detectors – Performance requirements of detectors for flammable gases
–
IEC 60079‑29‑4: Gas detectors – Performance requirements of open path detectors for flammable gases
–
IEC/IEEE 60079‑30‑1: Gas and dust – Electrical resistance trace heating – General and testing requirements.
–
IEC 60079‑31: Dust – Protection by enclosure “t”
–
IEC 60079‑33: Gas and dust – Special protection “s”
–
IEC 60079‑35‑1: Caplights for use in mines susceptible to firedamp – General requirements – Construction and testing in relation to the risk of explosion
–
IEC TS 60079‑39: Gas – Intrinsically safe systems with electronically controlled spark duration limitation
–
IEC TS 60079‑40: Gas – Requirements for process sealing between flammable process fluids and electrical systems
–
ISO 80079‑36: Gas and dust – Non-electrical equipment for explosive atmospheres – Basic method and requirements
This document, along with the additional parts of IEC 60079 mentioned above, is not applicable to the construction of
•
electromedical apparatus,
•
shot-firing exploders,
•
test devices for exploders, and
•
shot-firing circuits.
2Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60034‑1, Rotating electrical machines – Part 1: Rating and performance
IEC 60034‑5, Rotating electrical machines – Part 5: Degrees of protection provided by the integral design of rotating electrical machines (IP code) – Classification
IEC 60079‑1, Explosive atmospheres – Part 1: Equipment protection by flameproof enclosures "d"
IEC 60079‑20‑1, Explosive atmospheres – Part 20-1: Material characteristics for gas and vapour classification – Test methods and data
IEC 60079‑26, Explosive atmospheres – Part 26: Equipment with Equipment Protection Level (EPL) Ga
IEC 60079‑35‑1, Explosive atmospheres – Part 35-1: Caplights for use in mines susceptible to firedamp – General requirements – Construction and testing in relation to the risk of explosion
IEC 60086‑1, Primary batteries – Part 1: General
IEC 60192, Low-pressure sodium vapour lamps – Performance specifications
IEC 60216‑1, Electrical insulating materials – Thermal endurance properties – Part 1: Ageing procedures and evaluation of test results
IEC 60216‑2, Electrical insulating materials – Thermal endurance properties – Part 2: Determination of thermal endurance properties of electrical insulating materials – Choice of test criteria
IEC 60243‑1, Electric strength of insulating materials – Test methods – Part 1: Tests at power frequencies
IEC 60423, Conduit systems for cable management – Outside diameters of conduits for electrical installations and threads for conduits and fittings
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60662, High-pressure sodium vapour lamps – Performance specifications
IEC 60664‑1, Insulation coordination for equipment within low-voltage systems – Part 1: Principles, requirements and tests
IEC 60947‑1, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 62626‑1, Low-voltage switchgear and controlgear enclosed equipment – Part 1: Enclosed switch-disconnectors outside the scope of IEC 60947‑3 to provide isolation during repair and maintenance work
ISO 48, Rubber, vulcanized or thermoplastic – Determination of hardness (hardness between 10 IRHD and 100 IRHD)
ISO 178, Plastics – Determination of flexural properties
ISO 179 (all parts), Plastics – Determination of Charpy impact properties
ISO 262, ISO general-purpose metric screw threads – Selected sizes for screws, bolts and nuts
ISO 273, Fasteners – Clearance holes for bolts and screws
ISO 527‑2, Plastics – Determination of tensile properties – Part 2: Test conditions for moulding and extrusion plastics
ISO 965‑1, ISO general-purpose metric screw threads – Tolerances – Part 1: Principles and basic data
ISO 965‑3, ISO general-purpose metric screw threads – Tolerances – Part 3: Deviations for constructional screw threads
ISO 3601‑1, Fluid power systems – O-rings – Part 1: Inside diameters, cross-sections, tolerances and designation codes
ISO 3601‑2, Fluid power systems – O-rings – Part 2: Housing dimensions for general applications
ISO 4014, Hexagon head bolts – Product grades A and B
ISO 4017, Hexagon head screws – Product grades A and B
ISO 4026, Hexagon socket set screws with flat point
ISO 4027, Hexagon socket set screws with cone point
ISO 4028, Hexagon socket set screws with dog point
ISO 4029, Hexagon socket set screws with cup point
ISO 4032, Hexagon nuts, style 1 – Product grades A and B
ISO 4762, Hexagon socket head cap screws
ISO 4892‑2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc lamps
ISO 7380, Hexagon socket button head screws
ISO 14583, Hexalobular socket pan head screws
ANSI/UL 746B, Polymeric Materials – Long-Term Property Evaluations
ANSI/UL 746C, Polymeric Materials – Used in Electrical Equipment Evaluations
ASTM D5964, Standard practice for rubber IRM 901, IRM 902, and IRM 903 replacement oils for ASTM No. 1, ASTM No. 2, and ASTM No. 3
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
•
IEC Electropedia: available at http://www.electropedia.org/
•
ISO Online browsing platform: available at http://www.iso.org/obp
NOTEAdditional definitions applicable to explosive atmospheres can be found in IEC 60050‑426.
3.1
ambient temperature
temperature of the air or other media, in the immediate vicinity of the equipment or component
Note 1 to entry: This does not refer to the temperature of any process media, unless the equipment or component is totally immersed in the process media. See 5.1.1.
Note 2 to entry: If Ex Equipment or an Ex Component is located inside or adjacent to another piece of equipment, the “ambient temperature” is the temperature of the air or other media surrounding the Ex Equipment or Ex Component and may be higher than the ambient air surrounding the complete equipment due to the additional heat dissipated within the complete equipment.
Note 3 to entry: The ambient temperature referred to in the IEC 60079 series is only related to the explosion safety of the Ex Equipment or Ex Component.
3.2
area, hazardous
area in which an explosive atmosphere is present, or may be expected to be present, in quantities such as to require special precautions for the construction, installation and use of equipment
3.3
area, non-hazardous
area in which an explosive atmosphere is not expected to be present in quantities such as to require special precautions for the construction, installation and use of equipment
3.4
associated apparatus
electrical apparatus which contains both intrinsically safe and non-intrinsically safe circuits and is constructed so that the non-intrinsically safe circuits cannot adversely affect the intrinsically safe circuits
Note 1 to entry: Associated apparatus is either:
a)
additionally protected by a Type of Protection suitable for use in the appropriate explosive atmosphere, or
b)
not protected by a Type of Protection suitable for use in the appropriate explosive atmosphere and therefore is not to be used within an explosive atmosphere
3.5
Ex associated equipment
auxiliary equipment used in conjunction with explosion-protected equipment to maintain specific aspects of the Type of Protection of the explosion-protected equipment
Note 1 to entry: Examples include special time/current relays for increased safety motors, pressurization control systems, power limits for encapsulated Ex Equipment, and the like.
Note 2 to entry: Ex associated equipment is either:
a)
additionally protected by a Type of Protection suitable for use in the appropriate explosive atmosphere; or
b)
not protected by a Type of Protection suitable for use in the appropriate explosive atmosphere and therefore is not to be used within an explosive atmosphere,
Note 3 to entry: A similar concept is applied to intrinsic safety where it is referred to as “associated apparatus”. See 3.4. A single piece of equipment may include both Ex associated equipment and associated apparatus.
3.6
auto-ignition temperature
AIT
lowest temperature (of a surface) at which, under specified conditions (according to IEC 60079‑20‑1), an ignition of a flammable gas or vapour in mixture with air or air/inert gas occurs
3.7
cells and batteries
3.7.1
battery
one or more cells fitted with devices necessary for use, for example, terminals, marking and protective devices
Note 1 to entry: See Figure 1 for examples of typical battery constructions.
Figure 1 — Typical battery examples | |||||||
|
3.7.2
capacity
electric charge which a battery or cell can deliver under specified discharge conditions
Note 1 to entry: The SI unit for electric charge, or quantity of electricity, is the coulomb (1 C = 1 A × s) but in practice, capacity is usually expressed in ampere hours (Ah).
3.7.3
cell
basic functional unit, consisting of an assembly of electrodes, electrolyte, case, terminals and usually separators, that is a source of electric energy obtained by direct conversion of chemical energy
Note 1 to entry: See primary cell and secondary cell.
3.7.4
charging
operation during which a secondary cell or battery is supplied with electric energy from an external circuit which results in chemical changes within the cell and thus the storage of energy as chemical energy
3.7.5
deep discharge
event which reduces a cell voltage below that recommended by the cell or battery manufacturer
3.7.6
maximum open-circuit voltage
<<cell or battery>> voltage of a new primary battery or of a fully charged secondary battery when the discharge current is zero
Note 1 to entry: See Table 13 and Table 14 which show the maximum open-circuit voltage for acceptable cells.
3.7.7
nominal voltage
<<cell or battery>> suitable approximate value of the voltage used to designate or identify a cell or battery or an electrochemical system
3.7.8
vented cell or battery
secondary cell, or battery, having a cover provided with an opening through which gaseous products may escape
3.7.9
primary cell or battery
cell or battery which is not designed to be electrically recharged
3.7.10
reverse charging
act of forcing current through either a primary cell or secondary cell in the same direction as the normal flow, generally due to the reverse polarity in an expired cell of a series connected battery
3.7.11
sealed cell
secondary cell which remains closed and does not release either gas or liquid when operated within the limits specified by the cell manufacturer
Note 1 to entry: A sealed cell is often equipped with a safety device to protect against a dangerously high internal pressure and is designed to operate during its life in its original sealed state.
3.7.12
valve-regulated cell or battery
cell or battery which is closed under normal conditions but which has an arrangement which allows the escape of gas if the internal pressure exceeds a pre-determined value
Note 1 to entry: The cell cannot normally receive an addition to the electrolyte.
3.7.13
secondary cell or battery
cell which is designed to be electrically recharged
Note 1 to entry: The recharge is accomplished by way of a reversible chemical reaction.
3.7.14
battery compartment
compartment of the equipment that accommodates one or more cells and batteries
Note 1 to entry: The battery compartment is an integral part of the equipment.
Note 2 to entry: A battery compartment may be a battery container
3.7.15
battery container
enclosure to contain one or more cells or batteries
Note 1 to entry: See Figure 2 for examples of typical battery constructions.
Figure 2 — Typical battery compartment | |||||||||
|
3.7.16
battery case
cell case
cell or battery enclosure that is an integral part of the construction of the cell or battery
Note 1 to entry: The case can be sealed, valve-regulated, or vented.
3.7.17
replaceable battery pack
assembly consisting of one or more interconnected cells, along with any integrated protective components, which form a complete replaceable battery
Note 1 to entry: See Figure 3 for examples of typical replaceable battery pack construction.
Figure 3 — Typical replaceable battery pack | |||||||
|
3.8
breathing device
device which permits an exchange between the atmosphere within an enclosure and the surrounding atmosphere and which maintains the integrity of the Type of Protection
3.9
bushing
device carrying one or more conductors, insulated or bare, through an internal or external wall of an enclosure
3.10
cable gland
device permitting the introduction of one or more electric or fibre optic cables into an electrical Ex Equipment enclosure so as to maintain the relevant Type of Protection and provide a degree of strain relief
Note 1 to entry: See Figure A.1 for illustration of the terms used for cable glands.
3.10.1
clamping device
<<cable gland>> element of a cable gland for preventing tension or torsion in the cable from being transmitted to the connections
3.10.2
compression element
<<cable gland>> element of a cable gland compressing or displacing the sealing ring
3.10.3
sealing ring
<<cable gland>> element used in a cable gland to ensure the sealing between the cable gland and the cable
3.10.4
Ex Equipment cable gland
<<cable gland>> cable gland tested separately from the equipment enclosure but having an Ex Equipment certificate and which is intended to be fitted to an Ex Equipment enclosure
Note 1 to entry: This does not preclude an Ex Component certificate for cable glands.
3.10.5
cable transit device
<<cable gland>> an entry device, intended for one or more electric or fibre optic cables, with a seal made up of one or more separate elastomeric modules or parts of modules (modular internal seal), which are compressed together when the device is assembled and mounted as intended
Note 1 to entry: Cable transit devices serve as Ex Equipment Blanking Elements when the elastomeric modules provided allow for this function.
3.11
casting
<<non-metallic compound>> process of pouring a liquid compound at normal ambient pressure into a cast
3.12
certificate
document that conveys the assurance of the conformity of a product, process, system, person, or organization with specified requirements
Note 1 to entry: The certificate is either the supplier’s declaration of conformity or the purchaser’s recognition of conformity or certification (as a result of action by a third party) as defined in ISO/IEC 17000.
3.12.1
Ex Component Certificate
certificate prepared for an Ex Component (see 3.36)
3.12.2
Ex Equipment Certificate
certificate prepared for Ex Equipment
3.13
coating
material applied to a surface
3.14
conformal coating
electrical insulating material applied as a coating to loaded printed circuit boards to produce a thin layer conforming to the surface in order to provide a protective barrier against deleterious effects from environmental conditions
3.15
compound
<<for encapsulation>> any thermosetting, thermoplastic, epoxy resin or elastomeric materials with or without fillers and/or additives, in their solid state
3.16
conduit entry
means of introducing a conduit into Ex Equipment so as to maintain the relevant Type of Protection
3.17
connection facilities
terminals, screws or other parts, used for the electrical connection of conductors
3.18
connections, factory
terminations intended for connection during a manufacturing process under controlled conditions
3.19
connections, field-wiring
terminations intended for connection by the installer in the field
3.20
continuous operating temperature
COT
temperature range which ensures the stability and integrity of the material for the expected life of the equipment, or part, in its intended application
3.21
converter
<<for use with electric machines>> unit for electronic power conversion, changing one or more electrical characteristics and comprising one or more electronic switching devices and associated components, such as transformers, filters, commutation aids, controls, protections, and auxiliaries, if any
Note 1 to entry: A converter is also known by other terms. For example, a frequency converter, a converter drive, an inverter drive, a variable speed drive, an adjustable speed drive (ASD), or a variable frequency drive (VFD).
3.21.1
converter, soft-start
<<for use with electric machines>> converter which limits the input current to the electric machine during the starting process
Note 1 to entry: It is intended that the soft-start converter is used only during the starting process and is then isolated from the power system or bypassed when the electric machine is running.
3.22
degree of protection of enclosure
IP
numerical classification according to IEC 60529 or IEC 60034‑5 (as applicable) preceded by the symbol IP applied to the enclosure of equipment to provide:
–
protection of persons against contact with, or approach to, live parts and against contact with moving parts (other than smooth rotating shafts and the like) inside the enclosure,
–
protection of the equipment against ingress of solid foreign objects, and
–
where indicated by the classification, protection of the equipment against harmful ingress of water
Note 1 to entry: The detailed test requirements for rotating electric machines are in IEC 60034‑5.
Note 2 to entry: The enclosure which provides the degree of protection IP is not necessarily the same as the equipment enclosure providing the Type of Protection listed in Clause 1.
Note 3 to entry: An enclosure which provides the degree of protection required by one of the types of protection listed in Clause 1 will have been subjected to other tests prior to the tests for degree of protection. See 26.4.
3.23
draining device
device which permits liquids to flow out from an enclosure and which maintains the integrity of the Type of Protection
3.24
dust
generic term including both combustible dust and combustible flyings
3.24.1
combustible dust
finely divided solid particles, 500 μm or less in nominal size, which may form explosive mixtures with air at standard atmospheric pressure and temperatures
Note 1 to entry: This includes dust and grit as defined in ISO 4225.
Note 2 to entry: The term solid particles is intended to address particles in the solid phase and not the gaseous or liquid phase, but does not preclude a hollow particle.
3.24.1.1
conductive dust
combustible dust with electrical resistivity equal to or less than 1 kΩ·m
Note 1 to entry: ISO/IEC 80079‑20‑2 contains the test method for determining the electrical resistivity of dusts.
3.24.1.2
non-conductive dust
combustible dust with electrical resistivity greater than 1 kΩ·m
Note 1 to entry: ISO/IEC 80079‑20‑2 contains the test method for determining the electrical resistivity of dusts.
3.24.2
combustible flyings
solid particles, including fibres, where one dimension is greater than 500 μm in nominal size, which may form an explosive mixture with air at standard atmospheric pressure and temperature
Note 1 to entry: One dimension has a high ratio when compared to the other two dimensions
Note 2 to entry: Examples of flyings include carbon fibre, rayon, cotton (including cotton linters and cotton waste) sisal, jute, hemp, cocoa fibre, oakum and baled waste kapok.
3.25
dust-tight enclosure
enclosure capable of excluding the ingress of observable dust particle deposits
3.26
dust-protected enclosure
enclosure in which the ingress of dust is not totally excluded, but is unlikely to enter in sufficient quantity to interfere with the safe operation of the equipment and does not accumulate in a position within the enclosure where it is liable to cause an ignition hazard
3.27
duty cycle
repetitive variation of load in which the cycle time is too short for thermal equilibrium to be attained in the first cycle
[SOURCE: IEC 60050‑411:1996, 411‑51‑7]
3.28
elastomer
a macromolecular material which returns rapidly to approximately its initial dimensions and shape after substantial deformation by a weak stress and release of the stress
Note 1 to entry: The definition applies to room temperature test conditions.
[SOURCE: IEC 60050‑212:2010, 212‑14‑05]
3.29
encapsulation
process of applying a compound to enclose an electrical device(s) by suitable means
3.30
enclosure
all the walls, doors, covers, cable glands, rods, spindles, shafts, etc. which contribute to the Type of Protection or the degree of protection IP of the equipment
3.31
equipment
general term including apparatus, fittings, devices, components, and the like used as a part of, or in connection with, an installation
3.31.1
equipment, electrical
items applied as a whole or in part for the utilization of electrical energy
Note 1 to entry: These include, amongst others, items for the generation, transmission, distribution, storage, measurement, regulation, conversion and consumption of electrical energy and items for telecommunications.
3.31.2
equipment, fixed
equipment fastened to a support, or otherwise secured in a specific location when energized
3.31.3
equipment, personal
equipment intended to be worn by and in contact with a person’s body during operation
3.31.4
equipment, portable
equipment intended to be carried by a person during operation
Note 1 to entry: Portable equipment carried by a person during operation is sometimes referred to as hand-held equipment.
3.31.5
equipment, transportable
equipment not intended to be carried by a person during operation nor intended for fixed installation
3.32
equipment grouping
classification system of equipment related to the explosive atmosphere for which they are intended to be used
Note 1 to entry: IEC 60079‑0 identifies three equipment groups:Group I, equipment for mines susceptible to fire damp;
Group II, which is divided into sub-groups, equipment for all places with an explosive gas atmosphere other than mines susceptible to fire damp
Group III, which is divided into sub-groups, equipment for all places with an explosive dust atmosphere other than mines susceptible to fire damp
Group II, which is divided into sub-groups, equipment for all places with an explosive gas atmosphere other than mines susceptible to fire damp
Group III, which is divided into sub-groups, equipment for all places with an explosive dust atmosphere other than mines susceptible to fire damp
3.33
Equipment Protection level
EPL
Level of Protection assigned to equipment based on its likelihood of becoming a source of ignition and distinguishing the differences between explosive gas atmospheres, explosive dust atmospheres, and the explosive atmospheres in mines susceptible to firedamp
3.33.1
EPL Ma
equipment for installation in a mine susceptible to firedamp, having a "very high" Level of Protection, which has sufficient security that it is unlikely to become an ignition source in normal operation, during expected malfunctions or during rare malfunctions, even when left energized in the presence of an outbreak of gas
3.33.2
EPL Mb
equipment for installation in a mine susceptible to firedamp, having a "high" Level of Protection, which has sufficient security that it is unlikely to become a source of ignition in normal operation or during expected malfunctions in the time span between there being an outbreak of gas and the equipment being de-energized
3.33.3
EPL Ga
equipment for explosive gas atmospheres, having a "very high" Level of Protection, which is not a source of ignition in normal operation, during expected malfunctions or during rare malfunctions
3.33.4
EPL Gb
equipment for explosive gas atmospheres, having a "high" Level of Protection, which is not a source of ignition in normal operation or during expected malfunctions
3.33.5
EPL Gc
equipment for explosive gas atmospheres, having an "enhanced" Level of Protection, which is not a source of ignition in normal operation and which may have some additional protection to ensure that it remains inactive as an ignition source in the case of regular expected occurrences (for example failure of a lamp)
3.33.6
EPL Da
equipment for explosive dust atmospheres, having a "very high" Level of Protection, which is not a source of ignition in normal operation, during expected malfunctions, or during rare malfunctions
3.33.7
EPL Db
equipment for explosive dust atmospheres, having a "high" Level of Protection, which is not a source of ignition in normal operation or during expected malfunctions
3.33.8
EPL Dc
equipment for explosive dust atmospheres, having an "enhanced" level of protection, which is not a source of ignition in normal operation and which may have some additional protection to ensure that it remains inactive as an ignition source in the case of regular expected occurrences (for example failure of a lamp)
3.34
Ex Equipment blanking element
blanking element tested separately from the Ex Equipment enclosure but having an Ex Equipment certificate and which is intended to be fitted to an Ex Equipment enclosure
Note 1 to entry: This does not preclude an Ex Component certificate for blanking elements.
3.35
Ex Equipment thread adapter
thread adapter tested separately from the Ex Equipment enclosure but having an Ex Equipment certificate and which is intended to be fitted to an Ex Equipment enclosure
Note 1 to entry: This does not preclude an Ex Component certificate for thread adapters.
3.36
Ex Component
equipment intended to be part of Ex Equipment, marked with the symbol “U”, which is not intended to be used alone, and requires additional consideration when incorporated into Ex Equipment
3.37
Ex Equipment
explosion-protected equipment
Note 1 to entry: Such equipment often includes Ex Components, but additional evaluation is always required as part of their incorporation into equipment.
3.38
explosive atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapour, or dust which, after ignition, permits self-sustaining propagation
3.39
explosive dust atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of dust, which, after ignition, permits self-sustaining propagation
3.40
explosive gas atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas or vapour, which, after ignition, permits self-sustaining flame propagation
3.41
explosive test mixture
specified explosive mixture used for the testing of equipment for explosive gas atmospheres
3.42
fault, countable
fault which occurs in parts of electrical equipment conforming to the constructional requirements of the standard for the Type of Protection being considered
3.43
fault, non-countable
fault which occurs in parts of electrical apparatus not conforming to the constructional requirements of the standard for the Type of Protection being considered
3.44
firedamp
flammable mixture of gases naturally occurring in a mine
Note 1 to entry: Firedamp consists mainly of methane, but always contains small quantities of other gases, such as nitrogen, carbon dioxide, and hydrogen, and sometimes ethane and carbon monoxide. The terms firedamp and methane are used frequently in mining practice as synonyms.
3.45
free space
intentionally created space surrounding components or space inside components
3.46
fuse
a device that by the fusing of one or more of its specially designed and proportioned components intended to melt under the action of current exceeding some definite value for a definite period of time, opens the circuit in which it is inserted by breaking the current when this exceeds a given value for a sufficient time
3.47
galvanic isolation
arrangement within equipment which permits the transfer of signals or power between two circuits without any direct electrical connection between the two
Note 1 to entry: Galvanic isolation frequently utilizes either magnetic (transformer or relay) or opto-coupled elements.
3.48
gasket
compressible element provided in a joint of an enclosure to provide a degree of protection against the ingress of solid foreign objects or against the ingress of water
3.49
gas
gaseous state of a substance that cannot reach equilibrium with its liquid or solid state in the temperature and pressure range of interest
Note 1 to entry: This is a simplification of the scientific definition, and merely requires that the substance is above its boiling point or sublimation point at the ambient temperature and pressure.
3.50
hybrid mixture
mixture of a flammable gas or vapour with a dust
Note 1 to entry: According to ISO/IEC 80079‑20‑2, the term “dust” is defined as including both combustible dust and combustible flyings
3.51
infallible separation
separation between electrically conductive parts, not considered as subject to short circuits, when in conformity with the “infallible” constructional requirements of the standard for the Type of Protection being considered
3.52
joint
place where the corresponding surfaces of two parts of an enclosure, or the conjunction of two enclosures, come together
3.53
Level of Protection
subdivision of a Type of Protection, correlating with the Equipment Protection Level, that differentiates the likelihood of the equipment becoming a source of ignition
Note 1 to entry: For example, Type of Protection intrinsic safety “i” is subdivided into Levels of Protection “ia”, “ib”, and “ic; which correlate with Equipment Protection Levels Ga, Gb, and Gc (for explosive gas atmospheres).
3.54
limiting temperature
maximum permissible temperature for equipment or parts of equipment equal to the lower of the two temperatures determined by:
a)
the maximum surface temperature;
b)
the thermal stability of the materials used
3.55
lower flammable limit
LFL
concentration of flammable gas or vapour in air below which an explosive gas atmosphere does not form (see IEC 60079‑20‑1)
Note 1 to entry: For the purposes of Ex Equipment, this was previously referred to as the lower explosive limit (LEL).
Note 2 to entry: The concentration may be expressed as either a volume fraction or a mass per unit volume.
3.56
malfunction
situation where equipment or components do not perform their intended function with respect to explosion protection
Note 1 to entry: For the purposes of this standard this can happen due to a variety of reasons, including:
–
failure of one (or more) of the component parts of the equipment or components;
–
external disturbances (e.g. shocks, vibration, electromagnetic fields);
–
design error or deficiency (e.g. software errors);
–
disturbance of the power supply or other services;
–
loss of control by the operator (especially for portable equipment).
Note 2 to entry: Some earlier editions of the Type of Protection standards referred to a “malfunction” as a “fault”.
3.56.1
malfunction, expected
disturbances or equipment malfunctions which normally occur in practice
3.56.2
malfunction, rare
type of malfunction, which may happen, but only in rare instances
Note 1 to entry: Two independent expected malfunctions which, separately, would not create a source of ignition, but which, in combination, do create a source of ignition, are regarded as a single rare malfunction
3.57
maximum surface temperature
highest temperature which is attained in service under the most adverse conditions (but within the specified tolerances) by any part or surface of Ex Equipment
3.58
minimum ignition temperature of an explosive gas atmosphere
lowest temperature of a heated surface which, under specified conditions according to IEC 60079‑20‑1, will ignite a flammable substance in the form of a gas or vapour mixture with air
Note 1 to entry: This term and “Auto-Ignition Temperature” are often used interchangeably
3.59
minimum ignition temperature of a dust layer
lowest temperature of a hot surface at which ignition occurs in a dust layer under specified test conditions
Note 1 to entry: The ignition temperature of a dust layer may be determined by the test method given in ISO/IEC 80079‑20‑2.
3.60
minimum ignition temperature of a dust cloud
lowest temperature of a hot surface on which the most ignitable mixture of the dust with air is ignited under specified test conditions
Note 1 to entry: The ignition temperature of a dust cloud may be determined by the test method given in ISO/IEC 80079‑20‑2.
3.61
mist
liquid released through a small opening, at temperatures below its flash point, resulting in extremely small droplets forming a cloud
3.62
normal operation
operation of equipment conforming electrically and mechanically with its design specification and used within the limits specified by the manufacturer
Note 1 to entry: The limits specified by the manufacturer may include persistent operational conditions, e.g. operation on a duty cycle.
Note 2 to entry: Variation of the supply voltage within stated limits and any other operational tolerance is part of normal operation.
Note 3 to entry: For electric machines, normal operation is specified based on the duty type (S1…S10 per IEC 60034‑1).
3.63
overvoltage category
numeral defining a transient overvoltage condition
Note 1 to entry: Overvoltage categories I, II, III and IV are used, see IEC 60664‑1.
3.64
plastic
a material which contains as an essential ingredient a high polymer and which at some stage in its processing into finished products can be shaped by flow
Note 1 to entry: Elastomers, which are also shaped by flow, are not considered as plastics.
[SOURCE: IEC 60050‑212:2010, 212‑04‑02]
3.65
pollution degree
numeral characterizing the expected pollution of the micro-environment
Note 1 to entry: Pollution degrees 1, 2, 3 and 4 are used, see IEC 60664‑1.
3.66
propagating brush discharge
highly energetic electrostatic discharge from an insulating sheet, layer, or coating on a grounded conductive surface or from a material of high resistivity and high breakdown voltage with the two surfaces highly charged to opposite polarity
3.67
protective device
device provided to interrupt an electric circuit in case a parameter exceeds a predetermined value
Note 1 to entry: Parameters often include current, temperature, pressure flow etc.
3.68
pyrophoric substance
substance that ignites spontaneously on exposure to air (for example phosphorus) or water (for example potassium or sodium)
Note 1 to entry: Pyrophoric substances are outside the scope of IEC 60079‑0
3.69
radio frequency
electromagnetic waves from 9 kHz to 60 GHz
3.69.1
continuous transmission
transmission where the duration of the pulse is greater than half of the thermal initiation time
3.69.2
pulsed transmission
transmission where the duration of the pulse is shorter than half of the thermal initiation time, but the time between two consecutive pulses is longer than three times the thermal initiation time
3.69.3
thermal initiation time
time (over which the threshold power is averaged) during which energy deposited by the spark accumulates in a small volume of gas around it without significant thermal dissipation
Note 1 to entry: For times shorter than the thermal initiation time the total energy deposited by the spark will determine whether or not ignition occurs. For increasingly longer times, the power or rate at which energy is deposited becomes the determining factor for ignition.
3.69.4
threshold energy
Zth
for a pulsed radio-frequency discharge, the maximum energy of the single pulse which can be extracted from the receiving body
3.69.5
threshold power
Pth
effective output power of the transmitter multiplied by the antenna gain
Note 1 to entry: The gain is produced by an antenna concentrating radiation in a particular direction and is always related to a specified reference antenna
Note 2 to entry: The threshold power is considered to be equal to the Effective Isotropic Radiated Power (EIRP) per ITU-R BS.561-2.
3.69.6
antenna gain
gain produced by an antenna concentrating radiation in a particular direction
Note 1 to entry: The gain of antennas is frequently less than unity.
3.70
rated value
value, assigned generally by the manufacturer, for a specified operating condition of a component, device or apparatus
3.71
rated insulation voltage
RMS withstand voltage value assigned by the manufacturer to the equipment or to a part of it, characterizing the specified (long-term) withstand capability of its insulation
Note 1 to entry: The rated insulation voltage is not necessarily equal to the rated voltage of equipment which is primarily related to functional performance.
3.72
rating
set of rated values and operating conditions
3.73
recurring peak voltage
maximum peak value of periodic excursions of the voltage waveform resulting from distortions of an AC voltage or from AC components superimposed on a DC voltage
Note 1 to entry: Random overvoltages, for example due to occasional switching, are not considered as recurring peak voltages.
3.74
related drawing
drawing or document not listed in the certificate but linked to the schedule drawing, and used for example, for detailed manufacture of component parts
3.75
safety device
device intended for use inside or outside explosive atmospheres but required for or contributing to the safe functioning of equipment and protective systems with respect to the risks of explosion
3.76
schedule drawing
drawing or document listed in the certificate or test report
3.77
separation element
mechanical element, inside the equipment, which separates different parts of the equipment with different EPLs
Note 1 to entry: A separation element consists of a mechanical partition wall, which may be combined with a flameproof joint or natural ventilation.
3.78
serviceable condition
condition which permits a replacement or reclaimed component part to be used without prejudice to the performance or explosion protection aspects of the equipment, with due regard to the schedule drawings, as applicable, in which such a component part is used
3.79
service temperature
maximum or minimum temperature reached at specific points of the equipment when the equipment is operating at rated conditions, including ambient temperature and any external sources of heating or cooling(see 5.2)
Note 1 to entry: Equipment may reach different service temperatures in different parts.
3.80
solid insulation
electrical insulation material which is extruded or moulded, but not poured
Note 1 to entry: Insulators fabricated from two or more pieces of electrical insulating material, which are solidly bonded together may be considered as solid. The term solid insulation describes the final form and not necessarily the form in which they are initially applied. For windings of electrical machines, the process of using varnish as a means of consolidating and insulating the winding is considered to result in solid insulation, irrespective of how the varnish is applied.
3.81
spacings, electrical
separation distances between conductive parts at different electrical potentials
3.81.1
clearance
shortest distance in air between two conductive parts
3.81.2
creepage distance
shortest distance along the surface of a solid insulating material, in contact with air, between two conductive parts
3.81.3
distance through casting compound
shortest distance through a casting compound between two conductive parts
3.81.4
distance through solid insulation
shortest distance through solid insulation between two conductive parts
3.81.5
distance under coating
shortest distance between conductive parts along the surface of an insulating medium covered with insulating coating
3.82
special fastener
specific form of fastening device in accordance with IEC 60079‑0
3.83
symbol “U”
suffix to the certificate number used to denote an Ex Component
Note 1 to entry: The symbol “U” is used to identify that the equipment is incomplete and is not suitable for installation without further evaluation.
3.84
symbol “X”
suffix to the certificate number used to denote Specific Conditions of Use for Ex Equipment
Note 1 to entry: The symbol “X” is used to provide a means of identifying that essential information for the installation, use, and maintenance of the equipment is contained within the certificate.
3.85
temperature class
classification system of Ex Equipment, based on its maximum surface temperature, related to the specific explosive gas atmosphere for which it is intended to be used
3.86
termination compartment
compartment containing connection facilities
3.87
test, routine
test to which each individual device is subjected during or after manufacture to ascertain whether it complies with certain criteria
3.88
test, type
test of one or more devices made to a certain design to show that the design meets certain specifications
3.89
Type of Protection
specific measures applied to equipment to avoid ignition of a surrounding explosive atmosphere
3.90
upper flammable limit
UFL
concentration of flammable gas or vapour in air above which an explosive gas atmosphere does not form (see IEC 60079‑20‑1)
Note 1 to entry: For the purposes of Ex Equipment, this was previously referred to as the upper explosive limit (UEL).
Note 2 to entry: The concentration may be expressed as either a volume fraction or a mass per unit volume.
3.91
vapour
gaseous state of a substance that can reach equilibrium with its liquid or solid state in the temperature and pressure range of interest
Note 1 to entry: This is a simplification of the scientific definition, and merely requires that the substance is below its boiling point or sublimation point at the ambient temperature and pressure.
3.92
void
unintentional space created as a consequence of the encapsulation or filling process
3.93
working voltage
highest RMS value of the AC or DC voltage across any particular insulation which can occur when the equipment is supplied at rated voltage
Note 1 to entry: Transients are disregarded.
Note 2 to entry: Both open-circuit conditions and normal operating conditions are taken into account.
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Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
Gulf StandardGSO IEC 60079-0:2024
GSO IEC 60079-0:2024Gulf Standard
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