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BSI 21/30445647 DC:2021 Edition

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BS EN 60079-0. Explosive atmospheres – Part 0. Equipment. General requirements

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BSI 2021 140
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PDF Pages PDF Title
4 CONTENTS
11 FOREWORD
15 1 Scope
16 2 Normative references
18 3 Terms and definitions
38 4 Equipment grouping
4.1 General
4.2 Group I
39 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
40 5.1.2 External source of heating or cooling
5.2 Service temperature, TS
1.1
5.3 Maximum surface temperature
5.3.1 Determination of maximum surface temperature
41 5.3.2 Limitation of maximum surface temperature
5.3.2.1 Group I equipment
5.3.2.2 Group II equipment
5.3.2.3 Group III equipment
5.3.2.3.1 Maximum surface temperature for EPL Da
5.3.2.3.2 Maximum surface temperature for EPL Db
42 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
43 5.3.4 Component temperature of smooth surfaces for Group I or Group II equipment
44 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)
45 6.5 Gasket retention
6.6 Electromagnetic and ultrasonic energy radiating equipment
6.6.1 General
6.6.2 Radio frequency sources
46 6.6.3 Ultrasonic sources
47 6.6.4 Optical radiation sources
7 Non-metallic enclosures and non-metallic parts of enclosures
7.1 General
7.1.1 Applicability
7.1.2 Specification of materials
7.1.2.1 General
7.1.2.2 Plastic materials
48 7.1.2.3 Elastomers
7.1.2.4 Materials used for cementing
7.2 Thermal endurance
7.2.1 Tests for thermal endurance
7.2.2 Material selection
49 7.2.3 Alternative qualification of elastomeric sealing O-rings
7.3 Resistance to ultraviolet light
50 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
53 7.4.3 Avoidance of a build-up of electrostatic charge for Group III
54 7.5 Attached external conductive parts
8 Metallic enclosures and metallic parts of enclosures
8.1 Material composition
8.2 Group I
55 8.3 Group II
8.4 Group III
8.5 Copper Alloys
56 9 Fasteners
9.1 General fasteners
9.2 Special fasteners
9.3 Holes for special fasteners
9.3.1 Thread engagement
9.3.2 Tolerance and clearance
57 9.4 Hexagon socket set screws
58 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
59 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
60 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
61 15.7 Internal earth continuity plate
16 Entries into enclosures
16.1 General
16.2 Identification of entries
16.3 Cable glands
62 16.4 Blanking elements
16.5 Thread adapters
16.6 Temperature at branching point and entry point
63 16.7 Electrostatic charges of cable sheaths
17 Supplementary requirements for electric machines
17.1 General
64 17.2 Ventilation
17.2.1 Ventilation openings
17.2.2 External fans
17.2.2.1 External fan hood and external ventilation screens
17.2.2.2 Fan impellors
1.1.1 Fan impellors manufactured from materials containing aluminium, magnesium, titanium, or zirconium, shall comply with Clause 8.
17.2.3 Cooling fans of rotating electric machines
17.2.3.1 Fans and fan hoods
17.2.3.2 Construction and mounting of the ventilating systems
65 17.2.3.3 Clearances for the ventilating system
17.2.4 Auxiliary motor cooling fans
17.2.5 Room ventilating fans
17.2.5.1 Applicability
17.2.5.2 General
17.2.5.3 Fan and fan hoods
17.2.5.4 Construction and mounting
66 17.2.5.5 Clearances for rotating parts
17.3 Bearings
18 Supplementary requirements for switchgear
18.1 Flammable dielectric
18.2 Disconnectors
67 18.3 Group I – Provisions for locking
18.4 Doors and covers
19 Supplementary requirements for factory-wiring between enclosures
68 1
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
69 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
70 21.4 Sodium lamps
21.5 Replacement 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
71 23.3 Cell types
73 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
74 23.11 Replacement of cells or batteries
23.12 Replaceable battery pack
24 Documentation
24.1 Schedule drawings
24.2 Related drawings
25 Compliance of prototype or sample with documents
26 Type tests
26.1 General
75 26.2 Test configuration
26.3 Tests in explosive test mixtures
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
26.4.1.2 Non-metallic enclosures or non-metallic parts of enclosures
26.4.1.2.1 General
26.4.1.2.2 Group I equipment
76 26.4.1.2.3 Group II and Group III equipment
77 26.4.2 Resistance to impact
80 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
81 26.4.5.2 Acceptance criteria
26.5 Thermal tests
26.5.1 Temperature measurement
26.5.1.1 General
82 26.5.1.2 Service temperature, TS,
26.5.1.3 Maximum surface temperature
84 26.5.2 Thermal shock test
26.5.3 Small component ignition test (Group I and Group II)
26.5.3.1 General
26.5.3.2 Procedure
85 26.5.3.3 Acceptance criteria
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
86 26.7.2 Test temperatures
26.8 Thermal endurance to heat
87 26.9 Thermal endurance to cold
26.10 Resistance to UV light
26.10.1 General
88 26.10.2 Light exposure
26.10.3 Acceptance criteria
26.11 Resistance to chemical agents for Group I equipment
89 26.12 Earth continuity
90 26.13 Surface resistance test of parts of enclosures of non-metallic materials
91 26.14 Measurement of capacitance
26.14.1 General
26.14.2 Test procedure
92 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
93 26.17.2 Test sample
26.17.3 Test procedure
94 27 Routine tests
95 28 Manufacturer’s responsibility
28.1 Conformity with the Schedule Drawings
28.2 Certificate
28.3 Responsibility for marking
29 Marking
29.1 Applicability
29.2 Location
29.3 General
96 29.4 Ex marking for explosive gas atmospheres
99 29.5 Ex marking for explosive dust atmospheres
101 29.6 Combined types (or levels) of protection
29.7 Multiple types of protection
102 29.8 Ga equipment using two independent Gb types (or levels) of protection
29.9 Boundary wall
29.10 Ex Components
103 29.11 Small Ex Equipment and small Ex Components
29.12 Extremely small Ex Equipment and extremely small Ex Components
29.13 Alternative marking of Ex Equipment and Ex Components using digital technology
29.14 Warning markings
104 29.15 Cells and batteries
29.16 Electric machines supplied by a converter
105 29.17 Examples of marking1F
108 30 Instructions
30.1 General
109 30.2 Cells and batteries
110 30.3 Electric machines
111 30.4 Ventilating fans
30.5 Cable glands
112 Annex A (normative) Supplementary requirements for cable glands
A.1 General
A.2 Constructional requirements
A.2.1 Cable sealing
113 A.2.2 Filling compounds
A.2.3 Clamping
A.2.3.1 General
A.2.3.2 Group II or III cable glands
114 A.2.4 Lead-in of cable
A.2.4.1 Sharp edges
A.2.4.2 Point of entry
A.2.5 Release by a tool
A.2.6 Fixing
A.2.7 Degree of protection (IP) rating
115 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
116 A.3.1.2 Cable glands with clamping by filling compound
117 A.3.1.3 Cable glands with clamping by means of a clamping device
A.3.1.4 Clamping test
A.3.1.5 Mechanical strength
118 A.3.2 Tests of clamping of armoured cables
A.3.2.1 Tests of clamping where the armourings are clamped by a device integral to the gland
A.3.2.1.1 General
A.3.2.1.2 Clamping test
A.3.2.1.3 Mechanical strength
A.3.2.2 Tests of clamping where the armourings are not clamped by a device integral to the gland
119 A.3.3 Type test for resistance to impact
120 A.3.4 Test for degree of protection (IP) rating of cable glands
A.4 Marking
A.4.1 Marking of cable glands
A.4.2 Identification of cable-sealing rings
121 A.5 Instructions
122 Annex B (normative) Requirements for Ex Components
125 Annex C (informative) Example of rig for resistance to impact test
126 Annex D (informative) Electric machines supplied by a converter
127 Annex E (informative) Temperature evaluation of electric machines
130 Annex F (informative) Guidance flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)
131 Annex G (informative) Guidance flowchart for tests of cable glands
132 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
133 H.3 Shaft voltage determination for a rotating machine
134 H.4 Capacitance “C” calculation for a rotating machine
136 H.5 Energy “E” calculation for a rotating machine
H.6 Assessment using reference curves
138 Bibliography
BSI 21/30445647 DC
$24.66