1 Scope

Modification of Clause 1 to replace with the following:

This

part of IEC 60079

document

specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection “n” which includes; sealed devices “nC”, hermetically sealed devices “nC”, non-incendive components “nC” and restricted breathing enclosures “nR” intended for use in explosive gas atmospheres. This

part of IEC 60079

document

applies to electrical equipment where the rated input voltage does not exceed 15 kV r.m.s. AC or DC including where the internal working voltages of the Ex product exceeds 15 kV, for example starters for HID luminaires.

Where references are made to IEC, IEC/IEEE, ISO, ISO/IEC standards, the referenced requirements found in these standards shall apply as modified by any applicable US National Differences for the standard (see Clause 2).

This

part of IEC 60079

document

supplements and modifies the general requirements of

IEC 60079-0

UL 60079-0

, except as indicated in Table 1. Where a requirement of this

part of IEC 60079

document

conflicts with a requirement of

IEC 60079-0

UL 60079-0

, the requirement of this

part of IEC 60079

document

takes precedence.

Table 1 Relationship of IEC 60079-15UL 60079-15 to IEC 60079-0UL 60079-0

Clause of

IEC 60079-0

UL 60079-0

IEC 60079-0

UL 60079-0

clause application to

IEC 60079-15

UL 60079-15

Ed. 6.0 (

2011

2013

)

Ed. 7.0

(future edition)

2019

Clause / Subclause title

Protected sparking

Restricted breathing

(informative)

(normative)

"nC"

"nR"

Definitions

Applies

Equipment grouping

4.1

Group I

Excluded

4.2

Group II

Applies

4.3

Group III

Excluded

4.4

Equipment for a particular explosive atmosphere

Applies

Temperatures

5.1

Environmental influences

Applies

5.2

Service temperature

Applies

5.3

Maximum surface temperature

5.3.1

Determination of maximum surface temperature

Applies

5.3.2

Limitation of maximum surface temperature

5.3.2.1

Group I equipment

Excluded

5.3.2.2

Group II equipment

Applies

5.3.2.3

Group III electrical equipment

Excluded

5.3.3

Small component temperature for Group I and Group II equipment

Applies

Excluded

–

5.3.4

Component temperature of smooth surfaces for Group I or Group II equipment

(Applies for smaller than 10 000 mm

only)

Applies

Excluded

Requirements for all electrical apparatus

6.1

General

Applies

6.2

Mechanical strength

Applies

6.3

Opening times

Excluded

Applies

6.4

Circulating currents

Applies

6.5

Gasket retention

Applies

6.6

Electromagnetic and ultrasonic radiating equipment

Applies

Non-metallic enclosures and non-metallic parts of enclosures

7.1

General

7.1.1

Applicability

Applies

7.1.2

Specification of materials

Applies

7.2

Thermal endurance

7.2.1

Tests for thermal resistance

Applies

7.2.2

–

Material selection

Modified

–

7.2.2

Material selection

Applies

7.2.3

Alternative qualification for elastomeric sealing O-rings

Applies

7.3

Resistance to ultraviolet light

Applies

7.4

Electrostatic charges on external non-metallic materials

7.4.1

Applicability

Applies

7.4.2

Avoidance of build-up of electrostatic charge on Group I or Group II electrical equipment

Applies

7.4.3

Avoidance of build-up of electrostatic charge on equipment for Group III

Excluded

7.5

External conductive parts

Applies

Metallic enclosures and metallic parts of enclosures

8.1

Material composition

Applies

8.2

Group I

Excluded

8.3

Group II

Applies

8.4

Group III

Excluded

8.5

Copper alloys

Applies

Fasteners

9.1

General

Applies

9.2

Special fasteners

Excluded

9.3

Holes for special fasteners

Excluded

9.3.3

–

Hexagon socket set screws

Excluded

–

9.4

Hexagon socket set screws

Excluded

Interlocking devices

Excluded

Bushings

Applies

–

Materials used for cementing

Modified

–

Reserved for future use.

Modified

Ex components

Applies

Connection facilities

Applies

Connection facilities for earthing and bonding conductors

Applies

Entries into enclosures

Applies

Supplementary requirements for electric machines

Excluded

Supplementary requirements for switchgear

Excluded

18.1

Flammable dielectric

Excluded

Applies

18.2

Disconnectors

Excluded

Applies

18.3

Group I – Provisions for locking

Excluded

18.4

Doors and covers

Excluded

Applies

–

Supplementary requirements for fuses

Excluded

–

Reserved for future use.

Excluded

Supplementary requirements for plugs and sockets

20.1

General

Applies

20.2

Explosive gas atmospheres

Excluded

20.3

Explosive dust atmospheres

Excluded

20.4

Energized plugs

Applies

Supplementary requirements for luminaires

21.1

General

Applies

21.2

Covers for luminaires of EPL Mb, EPL Gb or EPL Db

Excluded

21.3

Covers for luminaires of EPL Gc or EPL Dc

Applies

21.4

Sodium lamps

Applies

Supplementary requirements for caplights and handlights

22.1

Group I caplights

Excluded

22.2

Group II and Group III caplights and handlights

Excluded

Applies

Equipment incorporating cells and batteries

Applies

23.12

Replacement battery pack

Applies

Documentation

Modified

Compliance of prototype or sample with documents

Applies

Type tests

Applies

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

Applies

26.4.1.2

Non-metallic enclosures or non-metallic parts of enclosures

26.4.1.2.1

General

Applies

26.4.1.2.2

Group I electrical equipment

Excluded

26.4.1.2.3

–

Group II and Group III electrical equipment

Modified

–

26.4.1.2.3

Group II and Group III electrical equipment

Applies

26.4.2

Resistance to impact

Applies

26.4.3

Drop test

Applies

26.4.4

Acceptance criteria

Applies

26.4.5

Degree of protection by enclosure

Applies

26.5

Thermal tests

26.5.1

Temperature measurement

Applies

26.5.1.1

General

Applies

26.5.1.2

Service Temperature

Applies

26.5.2

Thermal shock test

Applies

26.5.3

Small component ignition test (Group I and Group II)

Applies

Excluded

26.6

Torque test for bushings

Applies

26.7

Non-metallic enclosures or non-metallic parts of enclosures

26.7.1

General

Applies

26.7.2

–

Test temperatures

Modified

–

26.7.2

Test temperatures

Applies

26.8

–

Thermal endurance to heat

Modified

–

26.8

Thermal endurance to heat

Applies

26.9

Thermal endurance to cold

Applies

26.10

Resistance to light

26.10.1

General

Applies

26.10.2

Light exposure

Applies

26.10.3

Acceptace criteria

Applies

26.11

Resistance to chemical agents for Group I electrical equipment

Excluded

26.12

Earth continuity

Applies

26.13

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

Applies

26.14

Measurement of capacitance

26.14.1

General

Applies

26.14.2

Test procedure

Applies

26.15

Verification of ratings of ventilating fans

Excluded

26.16

Alternative qualification of elastomeric sealing Orings

Applies

–

26.17

Transferred charge test

Applies

Routine tests

Applies

Manufacturers responsibility

Applies

Marking

29.1

Applicability

Applies

29.2

Location

Applies

29.3

General

Applies

29.4

Ex marking for explosive gas atmospheres

Applies

29.5

Ex marking for explosive dust atmospheres

Excluded

29.6

Combined types (or levels) of protection

Applies

29.7

Multiple types of protection

Applies

29.8

Ga equipment using two independent Gb types (or levels) of protection

Excluded

–

29.9

Boundary wall

Excluded

29.9

29.10

Ex Components

Applies

29.10

29.11

Small Ex Equipment and small Ex Components

Applies

29.11

29.12

Extremely small equipment and extremely small Ex Components

Applies

29.12

29.13

Warning markings

Applies

29.13

–

Alternate marking of equipment protection levels (EPLs)

Applies

29.13.1

–

Alternate marking of type of protection for explosive gas atmospheres

Applies

29.13.2

–

Alternate marking of type of protection for explosive dust atmospheres

Excluded

29.14

Cells and batteries

Applies

29.15

Electrical machines operated with a converter

Applies

29.16

Examples of marking

Examples only

Instructions

30.1

General

Applies

30.2

Cells and batteries

Applies

30.3

Electric machines

Excluded

30.4

Ventilating fans

Excluded

–

30.5

Cable glands

Applies

Annex A

Supplementary requirements for Ex cable glands

Applies

Annex B

Requirements for Ex components

Applies

Annex C

Example of rig for resistance to impact test

Informative Annex

Annex D

Motors supplied by converters

Informative Annex

Annex E

Temperature evaluation of electric machines

Informative Annex

Annex F

Guideline flowchart for tests of non-metallic enclosures or non-metallic parts of enclosures (26.4)

Informative Annex

–

Annex G

Guidance flowchart for tests of cable glands

Informative Annex

–

Annex H

Shaft voltages resulting in motor bearing or shaft brush sparking. Discharge energy calculation

Informative Annex

Applies – This requirement of

IEC 60079-0

UL 60079-0

is applied without change.

Excluded – This requirement of

IEC 60079-0

UL 60079-0

does not apply.

Modified – This requirement of

IEC 60079-0

UL 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

UL 60079-0

are identified by the clause title which is normative. This document was written against the specific requirements of

IEC 60079-0

UL 60079-0

(ed. 7.0). The clause numbers for the previous edition are shown for information only. This is to enable the general requirements of

IEC 60079-0

UL 60079-0

(ed. 6.0) to be used where necessary with

this part of IEC 60079-0

document

. Where there is a conflict between requirements, the later edition requirements take precedence.

NOTE 2 A shaded row in the above table indicates that this is a clause heading. In cases where the applicability is the same for all of the sub-clauses the ‘Applies’ or ‘Excluded’ is listed in the heading row and the sub-clauses are not expanded. Where the application of the individual sub-clauses may be different, these are expanded in the above table and the applicability for each is listed.

NOTE 3 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.

Under preparation. Stage at the time of publication: IEC/FDIS 60079-0:2017.