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BS EN IEC 60079-0:2018 – TC:2019 Edition

BS EN IEC 60079-0:2018 – TC:2019 Edition

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Tracked Changes. Explosive atmospheres – Equipment. General requirements

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BSI 2019 331
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IEC 60079-0:2017 is also available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60079-0:2017 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). This seventh edition cancels and replaces the sixth edition, published in 2011. This edition constitutes a technical revision. Refer to the Foreword of the document for a complete listing of the technical changes between edition 7.0 and the previous edition of the document. Keywords: Ex Equipment and Ex Components intended for use in explosive atmospheres The contents of the interpretation sheet of April 2019 have been included in this copy.

PDF Catalog

PDF Pages PDF Title
1 compares BS EN IEC 60079-0:2018
2 TRACKED CHANGES
Test example 1
3 BS EN IEC 60079-0:2018 to BS EN 60079-0:2012+A11:2013
11 BS EN 60079-0:2012+A11:20132018 BRITISH STANDARD
Compliance with a British Standard cannot confer immunity from legal obligations.
Amendments/corrigenda issued since publication
12 EXPLOSIVE ATMOSPHERES –
INTERPRETATION SHEET 1
Interpretation:
14 EXPLOSIVE ATMOSPHERES –
INTERPRETATION SHEET 2
Question
What are the minor editorial, extensions, and major technical changes of the 6th edition with respect to the 5th edition?
Answer
The following table shows the significance of the changes.
The significance of the changes between IEC Standard, IEC 60079-0, Edition 5, 2007-10 (Including Corrigendum No.1 and Interpretation Sheet I-SH 01) and IEC 60079-0, Edition 6, 2011-06 are as listed below:
17 Atmosphères explosives – Partie 0: Matériel – Exigences générales
18 Endorsement notice
20 Annex ZA
(normative)
25 Annex ZY
(informative)
ZY.1 Equipment Groups and Categories
Table ZY.1
ZY.2 Instructions
ZY.3 Marking
ZY.3.1
26 II 1 G Ex ia IIB T4 Ga
ZY.3.2
ZY.4 Fans
ZY.4ZY.5 Significant changes between this European Standard and EN 60079-0:20092012+A11:2013
27 Table ZY.2 – Significant changes with respect to EN 60079-0:20092012+A11:
33 Explanations:
34 B) Information about the background of ‘Major Technical changes’
36 Annex ZZ
(informative)
Table ZZ.1 – Correspondence between this European Standard and Annex II of Directive 2014/34/EU [2014 OJ L96]
WARNING: Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard.. .
40 CONTENTS
46 INTERNATIONAL ELECTROTECHNICAL COMMISSION
54 EXPLOSIVE ATMOSPHERES –
1 Scope
55 2 Normative references
58 3 Terms and definitions
3.1
3.2
59 3.3
3.4
3.5
3.5.1
assembly of two or more cells electrically connected to each other to increase the voltage capacity or capacity
3.5.2
capacity
3.53.7
60 3.7.2
3.7.3
3.5.43.7.4
3.5.53.7.5
3.5.63.7.6
3.5.73.7.7
3.5.83.7.8
61 3.5.93.7.9
3.5.103.7.10
3.5.113.7.11
3.5.123.7.12
3.5.133.7.13
3.7.14
3.5.143.7.15
62 Figure 2 – Typical battery compartment
3.7.16
3.493.7.17
Figure 3 – Typical replaceable battery pack
3.63.9
63 3.73.10cable gland
3.7.13.10.1
3.7.23.10.2
3.7.33.10.3
3.7.43.10.4
3.7.53.10.5
3.83.12
3.8.13.12.1
3.8.23.12.2
64 3.13
3.93.15
3.113.17
3.123.18
3.133.19
3.143.20
3.153.21
3.163.21.1
3.173.22
65 3.23
3.183.24
3.18.13.24.1
3.18.1.13.24.1.1
3.18.1.23.24.1. 2
3.18.23.24.2
3.193.25
66 3.203.26
3.27
3.213.28
3.233.29
3.243.30
3.253.31
3.223.31.1
3.31.2
3.31.3
3.31.4
3.31.5
67 3.263.33
3.26.13.33.1
3.26.23.33.2
3.26.33.33.3
3.26.43.33.4
3.26.53.33.5
3.26.63.33.6
3.26.73.33.7
68 3.26.83.33.8
3.273.34
3.28
3.293.35
3.36
3.303.38
3.313.39
3.303.40
3.333.41
3.42
fault, countable
69 3.43
fault, non-countable
3.343.44
firedamp
flammable mixture of gases naturally occurring in a mine
3.353.45
free space
3.46
fuse
3.363.47
galvanic isolation
3.48
gasket
3.38
ignition temperature of a dust layer
lowest temperature of a hot surface at which ignition occurs in a dust layer of specified thickness on a hot surface
NOTE The ignition temperature of a dust layer may be determined by the test method given in IEC 61241-2-1.
3.39
ignition temperature of a dust cloud
lowest temperature of the hot inner wall of a furnace at which ignition occurs in a dust cloud in air contained therein
NOTE The ignition temperature of a dust cloud may be determined by the test method given in IEC 61241-2-1.
3.42
highest temperature which is attained in service under the most adverse conditions (but within the specified tolerances) by any part or surface of electrical equipment
NOTE 1 For electrical equipment in an explosive gas atmosphere, this temperature may occur on an internal component or on the external surface of the enclosure, depending upon the type of protection employed
NOTE 2 For electrical equipment in an explosive dust atmosphere, this temperature occurs on the external surface of the enclosure and may include a defined dust layer condition.
70 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
3.52
3.443.53
3.403.54
limiting temperature
a) the danger of ignition of the explosive atmosphere;
a) the maximum surface temperature;
b) the thermal stability of the materials used
3.55
lower flammable limit
LFL
3.413.56
malfunction
– 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;
3.41.13.56.1
expected malfunction, expected
71 3.41.23.56.2
3.57
maximum surface temperature
3.373.58
minimum ignition temperature of an explosive gas atmosphere
Note 1 to entry: This term and “Auto-Ignition Temperature” are often used interchangeably
3.59
minimum ignition temperature of a dust layer
3.60
minimum ignition temperature of a dust cloud
3.61
mist
3.433.62
normal operation
3.63
3.453.64
72 3.65
3.66
3.67
3.68
3.463.69
3.46.13.69.1
3.46.23.69.2
3.46.33.69.3
3.46.43.69.4
threshold energy
Zth
3.46.53.69.5
73 3.69.6
3.71
3.483.72
3.73
3.74
3.75
3.76
3.77
separation element
3.78
74 3.503.79
service temperature
NOTENote 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
3.513.81
spacings, electrical
separation distances between conductive parts at different electrical potentials
3.51.13.81.1
clearance
shortest distance in air between two conductive parts
3.51.23.81.2
creepage distance
3.51.33.81.3
3.51.43.81.4
3.51.53.81.5
3.82
3.523.83
symbol “U”
3.533.84
75 3.85
3.543.86
3.553.87
3.563.88
3.573.89
3.90
3.91
3.583.92
3.593.93
76 4 Equipment grouping
4.1 General
4.14.2 Group I
4.24.3 Group II
Group II subdivisions:
IIA, a typical gas is propane;
IIB, a typical gas is ethylene;
IIC, typical gas isgases are hydrogen and acetylene.
4.34.4 Group III
Group III subdivisions:
IIIA: combustible flyings;
IIIB: non-conductive dust;
IIIC: conductive dust.
77 4.44.5 Equipment for a particular explosive gas atmosphere
5 Temperatures
5.1 Environmental influences
5.1.1 Ambient temperature
Table 1 – Ambient temperatures in service and additional marking
5.1.2 External source of heating or cooling
5.2 Service temperature
78 5.3 Maximum surface temperature
5.3.1 Determination of maximum surface temperature
Maximum surface temperature shall be determined according to 26.5.1 considering the maximum ambient temperature and, where relevant, the maximum rated external source of heating.
5.3.2 Limitation of maximum surface temperature
5.3.2.2 Group II electrical equipment
The maximum surface temperature determined (see 26.5.1) shall not exceed:
Table 2 – Classification of maximum surface temperatures for Group II electrical equipment
79 5.3.2.3 Group III electrical equipment
5.3.2.3.3 Maximum surface temperature determined without a layer of dust for EPL Dc
5.3.3 Small component temperature for Group I or Group II electrical equipment
80 Table 3a3 – Assessment of temperature classification according to component size at 40 ºC ambient temperature
5.3.4 Component temperature of smooth surfaces for Group I or Group II electrical equipment
81 6 Requirements for all electrical equipment
6.1 General
6.2 Mechanical strength of equipment
6.3 Opening times
82 6.4 Circulating currents in enclosures (e.g. of large electricalelectric machines)
6.5 Gasket retention
6.6 Electromagnetic and ultrasonic energy radiating equipment
6.6.1 General
6.6.16.6.2 Radio frequency sources
83 Table 45 –Radio frequency Threshold power thresholds
Table 56 – Radio-frequencyThreshold energy thresholds
6.6.2 Lasers or other continuous wave sources
84 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
85 7.1.2 Specification of materials
7.1.2.2 Plastic materials
7.1.2.3 Elastomers
86 7.1.2.4 Materials used for cementing
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
87 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 onfor Group I or Group II electrical equipment
89 Table 67 – Limitation of surface areas
Table 78 – Maximum diameter or width
Table 89 – Limitation of thickness of non-metallic layer
90 Table 10 – Maximum acceptable transferred charge
7.4.3 Avoidance of a build-up of electrostatic charge on equipment for Group III
Painted/coated metal equipment and equipmentExternal surface of enclosures of plastic material shall and painted/coated metal enclosures are intended to be so designed so that under normal conditions of use, danger of ignition due to propagating brush…
Enclosures of plastic material cannot be charged to such a critical charge density that propagating brush discharges can be generated. However, no extended flat conductive surfaces shall be installed inside the enclosure within a distance of 8 mm to t…
NOTE 1 An internal printed circuit board may be considered to be an extended flat conductive surface, though this need not be applied in small hand-heldportable or personal equipment unless the equipment is likely to be subjected to a prolific charge …
91 7.5 Accessible metalAttached external conductive parts
Table 911 – Maximum capacitance of unearthed metalconductive parts
8 Metallic enclosures and metallic parts of enclosures
8.1 Material composition
92 8.2 Group I
8.3 Group II
8.4 Group III
8.5 Copper Alloys
93 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
94 Figure 14 – Tolerances and clearance for threaded fasteners
Figure 25 – Contact surface under head of fastener with a reduced shank
9.3.39.4 Hexagon socket set screws
In the case of threaded holes for hexagonHexagon socket set screws, the used to secure threaded holecovers, shall have a tolerance class of 6H in accordance with ISO 965-1 and ISO 965-3 and the set screw shall not protrude from the threaded hole after…
10 Interlocking devices
Where an interlocking device is used to maintain a specific typeType of protectionProtection, it shall be so constructed that its effectiveness cannot easily be defeated.
NOTE The intent is that the interlock be designed such that it cannot be easily defeated by common tools such as a screwdriver, pliers, or a similar tool.
11 Bushings
Bushings used as field wiring connection facilities and which may be subjected to a torque during connection or disconnection, shall be mounted in such a way that all parts are secured against turning.
95 The relevant torque test is specified in 26.6.
12 Materials used (Reserved for cementing future use)
The documents, according to Clause 24, shall include a data sheet or statement from the cement manufacturer to show that, the materials used for cementing on which the type of protection depends, have a thermal stability adequate for the minimum and m…
The materials used for cementing shall have a continuous operating temperature (COT) range that includes a minimum temperature that is below, or equal to, the minimum service temperature and a maximum temperature that is at least 20 K above the maximu…
NOTE 1 Equipment may have different service temperatures on different parts of the equipment. Selection and testing of individual materials is based on the specific service temperature of that part, but may alternatively be based on the maximum (or mi…
NOTE 2 If the cementing is to withstand adverse service conditions, appropriate measures should be agreed between the user and the manufacturer (see 6.1).
13 Ex Components
13.1 General
Ex Components shall comply with the requirements given in Annex B. Examples of Ex Components include:
13.2 Mounting
13.3 Internal mounting
13.4 External mounting
13.5 Ex Component certificate
96 14 Connection facilities and termination compartments
14.1 General
14.2 Termination compartment
14.314.2 Type of protection
14.414.3 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
97 15.3 Size of protective earthing conductor connection
Table 1012 – Minimum cross-sectional area of PE conductors
15.4 Size of equipotential bonding conductor connection
15.415.5 Protection against corrosion
15.515.6 Secureness of electrical connections
15.7 Internal earth continuity plate
16 Entries into enclosures
16.1 General
98 16.2 Identification of entries
16.3 Cable glands
16.4 Blanking elements
99 16.5 Thread adapters
16.6 Temperature at branching point and entry point
16.7 Electrostatic charges of cable sheaths
Figure 3a6 – Cable gland
100 17 Supplementary requirements for rotating electric machines
17.1 General
17.117.2 Ventilation
17.1.117.2.1 Ventilation openings
17.1.217.2.2 Materials for external fans
17.1.317.2.3 Cooling fans of rotating electric machines
17.1.3.117.2.3.1 Fans and fan hoods
17.1.3.217.2.3.2 Construction and mounting of the ventilating systems
101 17.1.3.317.2.3.3 Clearances for the ventilating system
17.1.417.2.4 Auxiliary motor cooling fans
17.2.5 Room ventilating fans
17.2.5.1 Applicability
17.2.5.2 General
17.1.5 Ventilating fans
17.2.5.3 Fan and fan hoods
17.2.5.4 Construction and mounting
102 17.2.5.5 Clearances for rotating parts
17.217.3 Bearings
18 Supplementary requirements for switchgear
18.1 Flammable dielectric
18.2 Disconnectors
103 18.3 Group I – Provisions for locking
18.4 Doors and covers
19 Supplementary requirementsReserved for fusesfuture use
20 Supplementary requirements for external plugs, socket outlets and connectorsconnectors for field wiring connection
20.1 General
104 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
105 21.3 Covers for luminaires of EPL Gc or EPL Dc
a) interlocked with a device which automatically disconnects all poles of the lampholder as soon asduring the cover opening procedure begins, or,
b) marked with the opening marking as required by item d) of 29.12.29.13.
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
106 NOTE Handlights include battery-powered lights which are also referred to as torches or flashlights.
23 Equipment incorporating cells and batteries
23.1 General
23.223.2 BatteriesInterconnection of cells to form batteries
23.3 Cell types
Only cell types referred to in published IEC cell standards having known characteristics Table 13 or Table 14 shall be used. Tables 11 and 12 below list cells for which suitable standards either exist or are to be produced.
107 Table 1113 – Primary cells
108 Table 1214 – Secondary cells
110 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
111 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
112 26.4 Tests of enclosures
26.4.1 Order of tests
26.4.1.1 Metallic enclosures, metallic parts of enclosures and glass or ceramic parts of enclosures
– tests for resistance to impact (see 26.4.2);
– drop test, if applicable (see 26.4.3);
– tests for degrees of protection (IP) (see 26.4.5);
– any other tests required by this standard;
– any other test specific to the typeType of protectionProtection concerned.
Tests shall be made on the number of samples specified by each test method.
26.4.1.2 Non-metallic enclosures or non-metallic parts of enclosures
26.4.1.2.1 General
113 26.4.1.2.226.4.1.2.3 Group II and Group III electrical equipment
26.4.2 Resistance to impact
114 Table 1315 – Tests for resistance to impact
115 26.4.3 Drop test
26.4.4 Acceptance criteria
26.4.5 Degree of protection (IP) by enclosures
26.4.5.1 Test procedure
– enclosures shall be considered as belonging to “Category 1 enclosure” as specified in IEC 60529,
– the equipment shall not be energized,
– where applicable, the dielectric test specified in IEC 60529 shall be carried out at [(2 Un + 1 000) ± 10 %] V r.m.s.RMS. applied between 10 s and 12 s, where Un is the maximum rated or internal voltage of the equipment.
116 When tested in accordance with IEC 60034-5, the rotating electrical machine shall not be energized,
26.4.5.2 Acceptance criteria
26.5 Thermal tests
26.5.1 Temperature measurement
117 26.5.1.2 Service temperature
26.5.1.3 Maximum surface temperature
118 26.5.2 Thermal shock test
26.5.3 Small component ignition test (Group I and Group II)
26.5.3.2 Procedure
119 26.5.3.3 Acceptance criteria
26.6 Torque test for bushings
26.6.1 Test procedure
Table 1416 – Torque to be applied to the stem of bushing used for connection facilities
120 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
Table 1517 – Thermal endurance test
121 26.9 Thermal endurance to cold
122 26.10 Resistance to UV light
26.10.1 Test procedureGeneral
26.10.2 Light exposure
26.10.226.10.3 Acceptance criteria
123 26.11 Resistance to chemical agents for Group I electrical equipment
26.12 Earth continuity
124 Figure 48 – Assembly of test sample for earth-continuity test
26.13 Surface resistance test of parts of enclosures of non-metallic materials
125 26.14 Measurement of capacitance
26.14.1 General
26.14.2 Test procedure
126 26.15 Verification of ratings of ventilating fans
26.16 Alternative qualification of elastomeric sealing O-rings
Figure 610 – Compression set of an O-ring
26.17 Transferred charge test
26.17.1 Test equipment
127 26.17.2 Test sample
26.17.3 Test procedure
128 27 Routine tests
28 Manufacturer’s responsibility
28.1 Conformity with the documentation
28.2 Certificate
129 28.3 Responsibility for marking
29 Marking
29.1 Applicability
29.2 Location
29.3 General
a) the name and address of the manufacturer; or his registered trade mark;
b) the manufacturer’s type identification;
130 29.4 Ex marking for explosive gas atmospheres
132 29.5 Ex marking for explosive dust atmospheres
134 29.6 Combined types (or levels) of protection
135 29.7 Multiple types of protection
29.8 Ga equipment using two independent Gb types (or levels) of protection
29.9 Boundary wall
136 29.1029.11 Small Ex equipmentEquipment and small Ex Components
29.1129.12 Extremely small equipmentEx Equipment and extremely small Ex Components
29.1229.13 Warning markings
137 Table 1618 – Text of warning markings
29.13 Alternate marking of equipment protection levels (EPLs)
29.13.1 Alternate marking of type of protection for explosive gas atmospheres
138 29.13.2 Alternate marking of type of protection for explosive dust atmospheres
29.14 Cells and batteries
29.15 Converter-fed electricalElectric machines operated with a converter
• “For Converter Supply”Operation”;
139 29.16 Examples of marking 12
142 30 Instructions
30.1 General
144 30.2 Cells and batteries
Table 19 – Example of type-test converter parameters
30.4 Ventilating fans
For Group I equipment, the applicable requirements of EN 1710 shall be applied.
145 30.5 Cable glands
146 (normative)
A.1 General
A.2 Constructional requirements
A.2.1 Cable sealing
147 Figure A.1 – Illustration of the terms used for cable glands
A.2.2 Filling compounds
A.2.3 Clamping
A.2.3.2 Group II or III cable glands
A.2.4 Lead-in of cable
148 A.2.4.2 Point of entry
Figure A.2 – Rounded edge of the point of entry of the flexible cable
A.2.5 Release by a tool
A.2.6 Fixing
A.2.7 Degree of protection
A.3 Type tests
A.3.1 Tests of clamping of non-armoured and braided cables
A.3.1.1 Cable glands with clamping by the sealing ring
150 A.3.1.2 Cable glands with clamping by filling compound
A.3.1.3 Cable glands with clamping by means of a clamping device
151 A.3.1.4 TensileClamping test
A.3.1.5 Mechanical strength
A.3.2 Tests of clamping of armoured cables
152 A.3.2.1.1A.3.2.1.2 TensileClamping test
A.3.2.1.2A.3.2.1.3 Mechanical strength
A.3.2.2 Tests of clamping where the armourings are not clamped by a device within integral to the gland
A.3.3 Type test for resistance to impact
153 Figure A.3 – Example of rig for resistance to impact test
A.3.4 Test for degree of protection (IP) of cable glands
154 A.4 Marking
A.4.1 Marking of cable glands
A.4.2 MarkingIdentification of cable-sealing rings
A.5 Instructions
156 Annex B
(normative)
Table B.1 – Clauses with which Applicability of clauses to Ex Components shall comply
161 Annex C
(informative)
162 Figure C.1 – Example of rig for resistance to impact test
163 Annex D
(informative)
164 Annex E
(informative)
167 Annex F
(informative)
168 Figure F.1 – Non-metallic enclosures or non-metallic parts of enclosures
169 Annex G
(informative)
170 Annex H
(informative)
H.1 General
H.2 Assessment of the risk of ignition using ignition energy calculation
171 Table H.1 – Maximum permitted energy
H.3 Shaft voltage determination for a rotating machine
H.4 Capacitance “C” calculation for a rotating machine
173 Figure H.2 – Air-gap between stator and rotor
174 Figure H.3 – Typical surfaces that form capacitors from the motor shaft to ground
H.5 Energy “E” calculation for a rotating machine
H.6 Assessment using reference curves
175 Figure H.4 – Capacitive ignition curves
176 Bibliography
181 undefined
198 English
CONTENTS
204 FOREWORD
211 1 Scope
212 2 Normative references
214 3 Terms and definitions
216 Figures
Figure 1 – Typical battery examples
217 Figure 2 – Typical battery compartment
218 Figure 3 – Typical replaceable battery pack
232 4 Equipment grouping
4.1 General
4.2 Group I
4.3 Group II
4.4 Group III
233 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
Tables
Table 1 – Ambient temperatures in service and additional marking
234 5.3 Maximum surface temperature
5.3.1 Determination of maximum surface temperature
5.3.2 Limitation of maximum surface temperature
Table 2 – Classification of maximum surface temperatures for Group II electrical equipment
235 5.3.3 Small component temperature for Group I or Group II electrical equipment
236 5.3.4 Component temperature of smooth surfaces for Group I or Group II electrical equipment
Table 3 – Assessment of temperature classification according to component size
Table 4 – Assessment of temperature classification Component surface area ≥ 20 mm2
237 6 Requirements for all equipment
6.1 General
6.2 Mechanical strength of equipment
6.3 Opening times
238 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
239 6.6.3 Ultrasonic sources
Table 5 – Threshold power
Table 6 – Threshold energy
240 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
241 7.2 Thermal endurance
7.2.1 Tests for thermal endurance
242 7.2.2 Material selection
7.2.3 Alternative qualification of elastomeric sealing O-rings
7.3 Resistance to ultraviolet light
243 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
244 Table 7 – Limitation of surface areas
245 7.4.3 Avoidance of a build-up of electrostatic charge for Group III
Table 8 – Maximum diameter or width
Table 9 – Limitation of thickness of non-metallic layer
Table 10 – Maximum acceptable transferred charge
246 7.5 Attached external conductive parts
247 8 Metallic enclosures and metallic parts of enclosures
8.1 Material composition
8.2 Group I
8.3 Group II
Table 11 – Maximum capacitance of unearthed conductive parts
248 8.4 Group III
8.5 Copper Alloys
9 Fasteners
9.1 General
249 9.2 Special fasteners
9.3 Holes for special fasteners
9.3.1 Thread engagement
9.3.2 Tolerance and clearance
Figure 4 – Tolerances and clearance for threaded fasteners
250 9.4 Hexagon socket set screws
10 Interlocking devices
11 Bushings
12 (Reserved for future use)
13 Ex Components
13.1 General
Figure 5 – Contact surface under head of fastener with a reduced shank
251 13.2 Mounting
13.3 Internal mounting
13.4 External mounting
13.5 Ex Component certificate
14 Connection facilities
14.1 General
252 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
253 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
Table 12 – Minimum cross-sectional area of PE conductors
254 16.3 Cable glands
16.4 Blanking elements
16.5 Thread adapters
255 16.6 Temperature at branching point and entry point
16.7 Electrostatic charges of cable sheaths
Figure 6 – Cable gland
Figure 7 – Conduit entry
256 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
257 17.2.4 Auxiliary motor cooling fans
17.2.5 Room ventilating fans
258 17.3 Bearings
18 Supplementary requirements for switchgear
18.1 Flammable dielectric
18.2 Disconnectors
259 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
260 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
261 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  
262 23 Equipment incorporating cells and batteries
23.1 General
23.2 Interconnection of cells to form batteries
23.3 Cell types
Table 13 – Primary cells
264 Table 14 – Secondary cells
265 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
266 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
267 26.4 Tests of enclosures
26.4.1 Order of tests
269 26.4.2 Resistance to impact
270 26.4.3 Drop test
Table 15 – Tests for resistance to impact
271 26.4.4 Acceptance criteria
26.4.5 Degree of protection (IP) by enclosures
272 26.5 Thermal tests
26.5.1 Temperature measurement
274 26.5.2 Thermal shock test
26.5.3 Small component ignition test (Group I and Group II)
275 26.6 Torque test for bushings
26.6.1 Test procedure
Table 16 – Torque to be applied to the stem of bushing used for connection facilities
276 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
Table 17 – Thermal endurance test
277 26.9 Thermal endurance to cold
26.10 Resistance to UV light
26.10.1 General
278 26.10.2 Light exposure
26.10.3 Acceptance criteria
26.11 Resistance to chemical agents for Group I equipment
279 26.12 Earth continuity
280 26.13 Surface resistance test of parts of enclosures of non-metallic materials
Figure 8 – Assembly of test sample for earth-continuity test
281 26.14 Measurement of capacitance
26.14.1 General
26.14.2 Test procedure
Figure 9 – Test piece with painted electrodes
282 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
Figure 10 – Compression set of an O-ring
283 26.17.2 Test sample
26.17.3 Test procedure
284 27 Routine tests
28 Manufacturer’s responsibility
28.1 Conformity with the documentation
285 28.2 Certificate
28.3 Responsibility for marking
29 Marking
29.1 Applicability
29.2 Location
29.3 General
286 29.4 Ex marking for explosive gas atmospheres
288 29.5 Ex marking for explosive dust atmospheres
291 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
292 29.11 Small Ex Equipment and small Ex Components
29.12 Extremely small Ex Equipment and extremely small Ex Components
29.13 Warning markings
293 29.14 Cells and batteries
29.15 Electric machines operated with a converter
Table 18 – Text of warning markings
294 29.16 Examples of marking
297 30 Instructions
30.1 General
298 30.2 Cells and batteries
299 30.3 Electric machines
30.4 Ventilating fans
Table 19 – Example of type-test converter parameters
300 30.5 Cable glands
301 Annexes
Annex A (normative) Supplementary requirements for cable glands
A.1 General
A.2 Constructional requirements
A.2.1 Cable sealing
302 A.2.2 Filling compounds
A.2.3 Clamping
A.2.4 Lead-in of cable
Figure A.1 – Illustration of the terms used for cable glands
303 A.2.5 Release by a tool
A.2.6 Fixing
A.2.7 Degree of protection
A.3 Type tests
A.3.1 Tests of clamping of non-armoured and braided cables
Figure A.2 – Rounded edge of the point of entry of the flexible cable
306 A.3.2 Tests of clamping of armoured cables
307 A.3.3 Type test for resistance to impact
308 A.3.4 Test for degree of protection (IP) of cable glands
Figure A.3 – Example of rig for resistance to impact test
309 A.4 Marking
A.4.1 Marking of cable glands
A.4.2 Identification of cable-sealing rings
A.5 Instructions
311 Annex B (normative) Requirements for Ex Components
Table B.1 – Applicability of clauses to Ex Components
314 Annex C (informative) Example of rig for resistance to impact test
Figure C.1 – Example of rig for resistance to impact test
315 Annex D (informative) Electric machines connected to converters
316 Annex E (informative) Temperature evaluation of electric machines
319 Annex F (informative) Guidance flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)
Figure F.1 – Non-metallic enclosures or non-metallic parts of enclosures
320 Annex G (informative) Guidance flowchart for tests of cable glands
321 Annex H (informative) Shaft voltages resulting in motor bearing or shaft brush sparking Discharge energy calculation
H.1 General
H.2 Assessment of the risk of ignition using ignition energy calculation
322 H.3 Shaft voltage determination for a rotating machine
H.4 Capacitance “C” calculation for a rotating machine
Table H.1 – Maximum permitted energy
324 Figure H.1 – Capacitance stored in bearing clearance of sleeve bearing Between journal and outer bearing housing
Figure H.2 – Air-gap between stator and rotor
325 H.5 Energy “E” calculation for a rotating machine
H.6 Assessment using reference curves
Figure H.3 – Typical surfaces that form capacitorsfrom the motor shaft to ground
326 Figure H.4 – Capacitive ignition curves
327 Bibliography

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