UL 60079-15

Explosive atmospheres - Part 15: Equipment protection by type of protection 'n'



This part of IEC 60079 specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection, "n" intended for use in explosive gas atmospheres. This standard applies to electrical equipment where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c.

1DV.1.1 Replace ?part of IEC 60079? with ?standard?.

This part of IEC 60079 is applicable to non-sparking electrical equipment and also to electrical equipment with parts or circuits producing arcs or sparks or having hot surfaces which, if not protected in one of the ways specified in this standard, could be capable of igniting a surrounding explosive gas atmosphere. This standard describes several different methods by which this can be achieved which may be combined with other methods described in IEC 60079-0.

1DV.2.1 Replace ?part of IEC 60079? with ?standard?.

This standard supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.

Table 1 - Relationship of this part to IEC 60079-0

Clause of IEC 60079-0

IEC 60079-0 clause application to IEC 60079-15

Ed. 5.0 (2007)

Ed. 6.0 (future edition)

Under consideration

Clause / Subclause title

Protected sparking

Non sparking

Restricted breathing

(informative)

(informative)

(normative)

nC

nA

nR

4

4

Equipment grouping

Applies

Applies

Applies

4.1

4.1

Group I

Excluded

Excluded

Excluded

4.2

4.2

Group II

Applies

Applies

Applies

4.3

4.3

Group III

Excluded

Excluded

Excluded

4.4

4.4

Equipment for a particular explosive atmosphere

Applies

Applies

Applies

5.1

5.1

Environmental influences

Applies

Applies

Applies

5.1.1

5.1.1

Ambient temperature

Applies

Applies

Applies

5.1.2

5.1.2

External source of heating or cooling

Applies

Applies

Applies

5.2

5.2

Service temperature

Applies

Applies

Applies

5.3.1

5.3.1

Determination of maximum surface temperature

Applies

Applies

Applies

5.3.2.1

5.3.2.1

Group I electrical equipment

Excluded

Excluded

Excluded

5.3.2.2

5.3.2.2

Group II electrical equipment

Applies

Applies

Applies

5.3.2.3

5.3.2.3

Group III electrical equipment

Excluded

Excluded

Excluded

5.3.3

5.3.3

Small component temperature for Group I and Group II electrical equipment

Applies

Applies

Excluded

6.1

6.1

General

Applies

Applies

Applies

6.2

6.2

Mechanical strength

Applies

Applies

Applies

6.3

6.3

Opening times

Excluded

Excluded

Applies

6.4

6.4

Circulating currents

Applies

Applies

Applies

6.5

6.5

Gasket retention

Applies

Applies

Applies

6.6

6.6

Electromagnetic and ultrasonic radiating equipment

Applies

Applies

Applies

7.1.1

7.1.1

Applicability

Applies

Applies

Applies

7.1.2

7.1.2

Specification of materials

Applies

Applies

Applies

7.1.3

7.1.2.2

Plastic materials

Applies

Applies

Applies

7.1.4

7.1.2.3

Elastomeric materials

Applies

Applies

Applies

7.2

7.2

Thermal endurance

Applies

Applies

Applies

7.3

7.3

Resistance to light

Applies

Applies

Applies

7.4

7.4

Electrostatic charges on external non-metallic materials

Applies

Applies

Applies

7.5

9.1

Threaded holes

Applies

Applies

Applies

8.1.1

8.2

Group I

Excluded

Excluded

Excluded

8.1.2

8.3

Group II

Applies

Applies

Applies

8.1.3

8.4

Group III

Excluded

Excluded

Excluded

8.2

9.1

Threaded holes

Applies

Applies

Applies

9.1

9.1

General

Applies

Applies

Applies

9.2

9.2

Special fasteners

Excluded

Excluded

Excluded

9.3

9.3

Holes for special fasteners

Excluded

Excluded

Excluded

10

10

Interlocking devices

Excluded

Excluded

Excluded

11

11

Bushings

Applies

Applies

Applies

12

12

Materials used for cementing

Modified

Modified

Modified

13

13

Ex components

Applies

Applies

Applies

14

14

Connection facilities and termination compartments

Modified

Modified

Modified

15

15

Connection facilities for earthing and bonding conductors

Applies

Applies

Applies

16

16

Entries into enclosures

Applies

Applies

Applies

17

17

Supplementary requirements for rotating electrical machines

Excluded

Modified

Excluded

18

18

Supplementary requirements for switchgear

Applies

Applies

Applies

19

19

Supplementary requirements for fuses

Modified

Modified

Modified

20

20

Supplementary requirements for plugs and sockets

Modified

Modified

Modified

21

21

Supplementary requirements for luminaires

Modified

Modified

Modified

22

22

Supplementary requirements for caplights and handlights

Applies

Applies

Applies

23

23

Equipment incorporating cells and batteries

Modified

Modified

Modified

24

24

Documentation

Applies

Applies

Applies

25

25

Compliance of prototype or sample with documents

Applies

Applies

Applies

26.1

26.1

General

Applies

Applies

Applies

26.2

26.2

Test configuration

Applies

Applies

Applies

26.3

26.3

Tests in explosive test mixtures

Applies

Applies

Applies

26.4

26.4

Tests of enclosures

Applies

Applies

Applies

26.4.1.1

26.4.1.1

Metallic enclosures, metallic parts of enclosures and glass parts of enclosures

Applies

Applies

Applies

26.4.1.2.1

26.4.1.2.1

Group I electrical equipment

Excluded

Excluded

Excluded

26.4.1.2.2

26.4.1.2.2

Group II and Group III electrical equipment

Applies

Applies

Applies

26.4.2

26.4.2

Resistance to impact

Applies

Applies

Applies

26.4.3

26.4.3

Drop test

Applies

Applies

Applies

26.4.4

26.4.4

Acceptance criteria

Applies

Applies

Applies

26.4.5

26.4.5

Degree of protection by enclosure

Applies

Applies

Applies

26.5

26.5

Thermal tests

Applies

Applies

Applies

26.6

26.6

Torque test for bushings

Applies

Applies

Applies

26.7

26.7

Non-metallic enclosures or non-metallic parts of enclosures

Modified

Modified

Modified

26.8

26.8

Thermal endurance to heat

Modified

Modified

Modified

26.9

26.9

Thermal endurance to cold

Applies

Applies

Applies

26.10

26.10

Resistance to light

Applies

Applies

Applies

26.11

26.11

Resistance to chemical agents for Group I electrical equipment

Excluded

Excluded

Excluded

26.12

26.12

Earth continuity

Applies

Applies

Applies

26.13

26.13

Surface resistance test of parts of enclosures of non-metallic materials

Applies

Applies

Applies

26.14

-

Charging tests

Applies

Applies

Applies

26.15

26.14

Measurement of capacitance

Applies

Applies

Applies

27

27

Routine tests

Applies

Applies

Applies

28

28

Manufacturers responsibility

Applies

Applies

Applies

29

29

Marking

Applies

Applies

Applies

30

30

Instructions

Applies

Applies

Applies

Annex A

Annex A

Supplementary requirements for Ex cable glands

Applies

Applies

Applies

Annex B

Annex B

Requirements for Ex components

Applies

Applies

Applies

Annex C

Annex C

Example of rig for resistance to impact test

Applies

Applies

Applies

Annex D

Annex D

Introduction to an alternative risk assessment method encompassing ?equipment protection levels? fro Ex equipment

Applies

Applies

Applies

Applies : this requirement of IEC 60079-0 is applied without change.

Excluded : this requirement of IEC 60079-0 does not apply.

Modified : this requirement of IEC 60079-0 is modified as detailed in this standard.

Table 1DV - Relationship of this part to IEC 60079-0

Clause of IEC 60079-0

IEC 60079-0 clause application to IEC 60079-15

Ed. 5.0 (2009)

Ed. 6.0 (future edition)

Under consideration

Clause / Subclause title

Protected sparking

Non sparking

Restricted breathing

(informative)

(informative)

(normative)

nC

nA

nR

4

4

Equipment grouping

Applies

Applies

Applies

-

4.1

Group I

Excluded

Excluded

Excluded

4.2

4.2

Group II

Applies

Applies

Applies

4.3

4.3

Group III

Excluded

Excluded

Excluded

4.4

4.4

Equipment for a particular explosive atmosphere

Applies

Applies

Applies

5.1

5.1

Environmental influences

Applies

Applies

Applies

5.1.1

5.1.1

Ambient temperature

Applies

Applies

Applies

5.1.2

5.1.2

External source of heating or cooling

Applies

Applies

Applies

5.2

5.2

Service temperature

Applies

Applies

Applies

5.3.1

5.3.1

Determination of maximum surface temperature

Applies

Applies

Applies

-

5.3.2.1

Group I electrical equipment

Excluded

Excluded

Excluded

5.3.2.2

5.3.2.2

Group II electrical equipment

Applies

Applies

Applies

5.3.2.3

5.3.2.3

Group III electrical equipment

Excluded

Excluded

Excluded

5.3.3

5.3.3

Small component temperature for Group I and Group II electrical equipment

Applies

Applies

Excluded

6.1

6.1

General

Applies

Applies

Applies

6.2

6.2

Mechanical strength

Applies

Applies

Applies

6.3

6.3

Opening times

Excluded

Excluded

Applies

6.4

6.4

Circulating currents

Applies

Applies

Applies

6.5

6.5

Gasket retention

Applies

Applies

Applies

6.6

6.6

Electromagnetic and ultrasonic radiating equipment

Applies

Applies

Applies

7.1.1

7.1.1

Applicability

Applies

Applies

Applies

7.1.2

7.1.2

Specification of materials

Applies

Applies

Applies

7.1.3

7.1.2.2

Plastic materials

Applies

Applies

Applies

7.1.4

7.1.2.3

Elastomeric materials

Applies

Applies

Applies

7.2

7.2

Thermal endurance

Applies

Applies

Applies

7.3

7.3

Resistance to light

Applies

Applies

Applies

7.4

7.4

Electrostatic charges on external non-metallic materials

Applies

Applies

Applies

7.5

9.1

Threaded holes

Applies

Applies

Applies

-

7.5

Accessible metal parts

Excluded

Excluded

Excluded

-

8.2

Group I

Excluded

Excluded

Excluded

8.1.2

8.3

Group II

Applies

Applies

Applies

8.1.3

8.4

Group III

Excluded

Excluded

Excluded

8.2

9.1

Threaded holes

Applies

Applies

Applies

9.1

9.1

General

Applies

Applies

Applies

9.2

9.2

Special fasteners

Excluded

Excluded

Excluded

9.3

9.3

Holes for special fasteners

Excluded

Excluded

Excluded

10

10

Interlocking devices

Excluded

Excluded

Excluded

11

11

Bushings

Applies

Applies

Applies

12

12

Materials used for cementing

Modified

Modified

Modified

13

13

Ex components

Applies

Applies

Applies

14

14

Connection facilities and termination compartments

Modified

Modified

Modified

15

15

Connection facilities for earthing and bonding conductors

Applies

Applies

Applies

16

16

Entries into enclosures

Applies

Applies

Applies

17

17

Supplementary requirements for rotating electrical machines

Excluded

Modified

Excluded

18

18

Supplementary requirements for switchgear

Applies

Applies

Applies

19

19

Supplementary requirements for fuses

Modified

Modified

Modified

20

20

Supplementary requirements for plugs and sockets

Modified

Modified

Modified

21

21

Supplementary requirements for luminaires

Modified

Modified

Modified

22

22

Supplementary requirements for caplights and handlights

Applies

Applies

Applies

23

23

Equipment incorporating cells and batteries

Modified

Modified

Modified

24

24

Documentation

Applies

Applies

Applies

25

25

Compliance of prototype or sample with documents

Applies

Applies

Applies

26.1

26.1

General

Applies

Applies

Applies

26.2

26.2

Test configuration

Applies

Applies

Applies

26.3

26.3

Tests in explosive test mixtures

Applies

Applies

Applies

26.4

26.4

Tests of enclosures

Applies

Applies

Applies

26.4.1.1

26.4.1.1

Metallic enclosures, metallic parts of enclosures and glass parts of enclosures

Applies

Applies

Applies

-

26.4.1.2.1

Group I electrical equipment

Excluded

Excluded

Excluded

26.4.1.2.2

26.4.1.2.2

Group II and Group III electrical equipment

Applies

Applies

Applies

26.4.2

26.4.2

Resistance to impact

Applies

Applies

Applies

26.4.3

26.4.3

Drop test

Applies

Applies

Applies

26.4.4

26.4.4

Acceptance criteria

Applies

Applies

Applies

26.4.5

26.4.5

Degree of protection by enclosure

Applies

Applies

Applies

26.5

26.5

Thermal tests

Applies

Applies

Applies

26.6

26.6

Torque test for bushings

Applies

Applies

Applies

26.7

26.7

Non-metallic enclosures or non-metallic parts of enclosures

Modified

Modified

Modified

26.8

26.8

Thermal endurance to heat

Modified

Modified

Modified

26.9

26.9

Thermal endurance to cold

Applies

Applies

Applies

26.10

26.10

Resistance to light

Applies

Applies

Applies

-

26.11

Resistance to chemical agents for Group I electrical equipment

Excluded

Excluded

Excluded

26.13

26.13

Surface resistance test of parts of enclosures of non-metallic materials

Applies

Applies

Applies

26.14

-

Charging tests

Applies

Applies

Applies

26.15

26.14

Measurement of capacitance

Applies

Applies

Applies

-

26.15

Verification of ratings of ventilating fans

Excluded

Excluded

Excluded

-

26.16

Alternative qualification of elastomeric sealing O-rings

Applies

Applies

Applies

27

27

Routine tests

Applies

Applies

Applies

28

28

Manufacturers responsibility

Applies

Applies

Applies

29

29

Marking

Applies

Applies

Applies

30

30

Instructions

Applies

Applies

Applies

Annex A

Annex A

Supplementary requirements for Ex cable glands

Applies

Applies

Applies

Annex B

Annex B

Requirements for Ex components

Applies

Applies

Applies

Annex C

Annex C

Example of rig for resistance to impact test

Applies

Applies

Applies

Annex D

Annex D

Introduction to an alternative risk assessment method encompassing ?equipment protection levels? fro Ex equipment

Applies

Applies

Applies

-

Annex E

Temperature rise testing of electric machines

Applies

Applies

Applies

-

Annex F

Guideline flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures

Applies

Applies

Applies

-

Annex G

Common standards - safety requirements for electrical equipment

Applies

Applies

Applies

-

Annex H

United States Major National Differences

Applies

Applies

Applies

-

Annex I

Equipment grounding

Applies

Applies

Applies

Applies : this requirement of IEC 60079-0 is applied without change.

Excluded : this requirement of IEC 60079-0 does not apply.

Modified : this requirement of IEC 60079-0 is modified as detailed in this standard.

NOTE 1 The clause number in the above table is shown for information only. The applicable requirements of IEC 60079-0 are identified by the clause title which is normative. This document was written against the specific requirements of IEC 60079-0 (ed. 5.0). The clause numbers for the previous edition are shown for information only. This is to enable the General Requirements IEC 60079-0 (ed. 5.0) to be used where necessary with this part of IEC 60079. Where there were no requirements, indicated by ?NR? or there is a conflict between requirements, the later edition requirements take precedence.

NOTE 2 A non-incendive component is limited in use to the particular circuit for which it has been shown to be non-ignition capable and, therefore, cannot be separately assessed as complying with this standard.

NOTE 3 Compliance with this standard does not imply any removal of, or lowering of the requirements of any other standard with which the electrical equipment complies.

NOTE 4 This part of IEC 60079 supplements, and may enhance, the requirements for equipment for normal industrial applications. Where compliance with other IEC standards is indicated, such as IEC 60034 for motors and IEC 60598-2 for luminaires, proving compliance to those standards is normally the responsibility of the manufacturer.

NOTE 5 Type of protection ?n? provides Equipment Protection Level (EPL) Gc. For further information, see IEC 60079-0.

1DV.3.1 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.


DETAILS

  • Edition Number: 4
  • Edition Date: 02/15/2013
  • Price Code: G
  • Type: ulisaiec
  • ANSI Approved: 02/15/2013
  • DOD Approved: