Source: https://standardscatalog.ul.com/standards/en/standard_60079-0_5
Timestamp: 2018-06-20 20:53:16
Document Index: 541744367

Matched Legal Cases: ['art 0', 'art 25', 'art 26', 'art 28', 'art 1', 'art 30']

UL - 60079-0 Explosive atmospheres - Part 0: Equipment - General requirements | Standards Catalog
1DV.1 Modification of Clause 1 first paragraph to replace with the following:
1DV.1.1 This standard specifies the general requirements for construction, testing and marking of electrical equipment and Ex components to use in explosive atmospheres. Explosive atmospheres are identified by the National Electrical Code®, NFPA 70 as hazardous (classified) locations and include the following specified locations.
• Class I, Zone 0;
• Class I, Zone 1;
• Class I, Zone 2;
• Zone 20;
• Zone 21; and
• Zone 22.
Unless modified by one of the standards supplementing this standard, electrical equipment complying with this standard is intended for use in hazardous areas in which explosive atmospheres exist under normal atmospheric conditions of
The application of electrical equipment in atmospheric conditions outside this range requires special consideration and may require additional assessment and testing.
NOTE 1 Although the normal atmospheric conditions above give a temperature range for the atmosphere of -20°C to +60°C, the normal ambient temperature range for the equipment is -20°C to +40°C, unless otherwise specified and marked. See 5.1.1.
NOTE 2 In designing equipment for operation in explosive atmospheres under conditions other than the atmospheric conditions given above, this standard may be used for guidance. However, additional testing related specifically to the intended conditions of use is recommended. This is particularly important when the types of protection ‘flameproof enclosure “d”’ ( IEC 60079-1) and ‘intrinsic safety “i”’ ( IEC 60079-11 or IEC 61241-11) are applied.
1DV.2 Modification of Clause 1 Note 2 as follows:
1DV.2.1 Delete “( IEC 60079-1) ” and “( IEC 60079-11 or IEC 61241-11)”.
NOTE 3 Requirements given in this standard result from an ignition hazard assessment made on electrical equipment. The ignition sources taken into account are those found associated with this type of equipment, such as hot surfaces, mechanically generated sparks, thermite reactions, electrical arcing and static electric discharge in normal industrial environments.
NOTE 4 It is acknowledged that, with developments in technology, it may be possible to achieve the objectives of the IEC 60079 series of standards in respect of explosion prevention by methods that are not yet fully defined. Where a manufacturer wishes to take advantage of such developments, this International Standard, as well as other standards in the IEC 60079 series, may be applied in part. It is intended that the manufacturer prepare documentation that clearly defines how the IEC 60079 series of standards has been applied, together with a full explanation of the additional techniques employed. The designation “Ex s” has been reserved to indicate a type of protection that is not defined by the IEC 60079 series of standards, but may be referenced in national requirements.
1DV.3 Delete Clause 1 Note 4.
NOTE 5 Where an explosive gas atmosphere and a combustible dust atmosphere are, or may be, present at the same time, the simultaneous presence of both should be considered and may require additional protective measures.
NOTE 6 Such equipment should be subjected to a hazard analysis that identifies and lists all of the potential sources of ignition by the electrical equipment and the measures to be applied to prevent them becoming effective.
– IEC 60079-2: Gas – Pressurized enclosures "p";
– IEC 60079-6: Gas – Oil immersion "o";
– IEC 60079-11: Gas – Intrinsic safety "i";
– IEC 61241-1: Dust – Protection by enclosures “tD”;
– IEC 61241-2 (IEC 61241-4): Dust – Pressurization “pD”;
– IEC 61241-11: Dust – Intrinsic safety “iD”.
1DV.4 Modification of Clause 1 fifth paragraph to replace with the following dashed items:
1DV.4.1 – ISA 60079-2 (12.04.01): Gas – Pressurized enclosures "p";
– ISA 61241-1 (12.10.03): Dust – Protection by enclosures “tD”;
– ISA 61241-2 (12.10.06): Dust – Pressurization “pD”;
– ISA 61241-11 (12.10.04): Dust – Intrinsic safety “iD”.
– ISA 61241-18 (12.10.07): Dust – Encapsulation “mD”.
– UL 60079-1: Gas – Flameproof enclosures "d";
– UL 60079-5: Gas – Powder filling "q";
– UL 60079-6: Gas – Oil immersion "o";
– UL 60079-7: Gas – Increased safety "e";
– UL 60079-11: Gas – Intrinsic safety "i";
– UL 60079-15: Gas – Type of protection “n”;
– UL 60079-18: Gas and Dust – Encapsulation "m".
NOTE 7 The former requirements of IEC 61241-18, Encapsulation “mD”, have been incorporated in IEC 60079-18.
1DV.5 Delete Clause 1 Note 7.
1DV.5.1 This Note does not apply.
IEC 60079-25: Electrical apparatus for explosive gas atmospheres – Part 25: Intrinsically safe systems
IEC 60079-26: Explosive atmospheres – Part 26: Equipment with equipment protection level (EPL) Ga
IEC 60079-28: Explosive atmospheres – Part 28: Protection of equipment and transmission systems using optical radiation
IEC 62013-1: Caplights for use in mines susceptible to firedamp – Part 1: General requirements – Construction and testing in relation to the risk of explosion
IEC 60079-30-1: Explosive atmospheres – Part 30-1: Electrical resistance trace heating – General and testing requirements.
1DV.6 Modification of Clause 1 sixth paragraph to replace with the following and addition of Note.
1DV.6.1 ANSI/ISA 60079-26 (12.00.03): Electrical equipment for use in Class I, Zone 0 hazardous (classified) locations
ANSI/IEEE 515: Standard for Testing, Design, Installation, and Maintenance of Electrical Heat Tracing for Industrial Applications
NOTE Components such as power connections, splices, end terminations, as well as cable entries, fittings, and seals, are to be evaluated according to the type of protection employed.
1DV.7 Addition of 7DV:
1DV.7.1 The U.S. version of IEC 60079-0 does not include requirements for Group I electrical apparatus. Requirements for Group I electrical apparatus included in this document are to be considered omitted in all instances where they appear.
1DV.8 Addition of 8DV:
1DV.8.1 Where references are made to other IEC 60079 standards, the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.
4.4 Equipment for a particular explosive atmosphere
5.2 Service temperature
5.3 Maximum surface temperature
6 Requirements for all electrical apparatus
6.2 Mechanical strength of equipment
6.3 Opening times
6.4 Circulating currents
6.5 Gasket retention
6.6 Electromagnetic and ultrasonic energy radiating equipment
7 Non-metallic enclosures and non-metallic parts of enclosures
7.2 Thermal endurance
7.3 Resistance to light
7.4 Electrostatic charges on external non-metallic materials
7.5 Threaded holes
8.1 Material composition
8.2 Threaded holes
9.2 Special fasteners
9.3 Holes for special fasteners
13.2 Mounting
13.3 Internal mounting
13.4 External mounting
14.2 Termination compartment
14.3 Type of protection
14.4 Creepage and clearance
15.1 Equipment requiring earthing
15.2 Equipment not requiring earthing
15.3 Size of conductor connection
15.4 Protection against corrosion
15.5 Secureness of electrical connections
16.2 Identification of entries
16.3 Cable glands
16.4 Blanking elements
16.5 Temperature at branching point and entry point
16.6 Electrostatic charges of cable sheaths
17 Supplementary requirements for rotating electrical machines
17.1 Fans and fan hoods
17.2 Ventilation openings for external fans
17.3 Construction and mounting of the ventilating systems
17.4 Clearances for the ventilating system
17.5 Materials for external fans and fan hoods
17.6 Equipotential bonding conductors
18.1 Flammable dielectric
18.2 Disconnectors
18.3 Group I &ndash; Provisions for locking
18.4 Doors and covers
20 Supplementary requirements for plugs, socket outlets and connectors
20.1 Interlocking
20.2 Energized plugs
21.2 Covers for luminaires of EPL Gb or EPL Db
21.3 Covers for luminaires of EPL Gc or EPL Dc
21.4 Special lamps
22.1 Group I caplights
22.2 Group II and Group III caplights and handlights
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
23.11 Replacement of cells or batteries
23.12 Replaceable battery pack
26.2 Test configuration
26.3 Tests in explosive test mixtures
26.4 Tests of enclosures
26.5 Thermal tests
26.6 Torque test for bushings
26.7 Non-metallic enclosures or non-metallic parts of enclosures
26.8 Thermal endurance to heat
26.9 Thermal endurance to cold
26.10 Resistance to light
26.11 Resistance to chemical agents for Group I electrical equipment
26.12 Earth continuity
26.13 Surface resistance test of parts of enclosures of non-metallic materials
26.14 Charging tests
26.15 Measurement of capacitance
28.1 Conformity with the documentation
28.2 Certificate
28.3 Responsibility for marking
29.1 Location
29.3 Ex marking for explosive gas atmospheres
29.4 Ex marking for explosive dust atmospheres
29.5 Combined types of protection
29.6 Multiple types of protection
29.7 Ga using two independent Gb types of protection
29.8 Ex components
29.9 Small equipment and small Ex components
29.10 Extremely small equipment and extremely small Ex components
29.11 Warning markings
29.12 Alternate marking of equipment protection levels (EPLs)
29.13 Cells and batteries
29.14 Examples of marking
29.15DV.1 External grounding or bonding terminals
29.16DV.1 Class I, Division 2, Equivalency Marking
29.16DV.2 Class I, Division 2, Group C
29.16DV.3 Class I, Division 2, Group B
29.16DV.4 Class I, Division 2, Group A
29.17DV.1 Class I, Division 1, Equivalency Marking
29.17DV.2 Class I, Division 1, Group C
29.17DV.3 Class I, Division 1, Group B
29.17DV.4 Class I, Division 1, Group A
29.18DV.1 Abbreviated Markings
30.2 Cells and batteries
Annex A (normative) Supplementary requirements for cable glands
Annex C (informative) Example of rig for resistance to impact test
Annex D (informative) Introduction of an alternative risk assessment method encompassing &ldquo;equipment protection levels&rdquo; for Ex equipment
Annex E (informative)Motors supplied by converters
Annex DVF(Informative)Common Standards &ndash; Safety Requirements for Electrical Equipment
Annex DVG(informative) Equipment grounding
UL 60079-0 REFERENCES THESE STANDARDS