1 Scope

This

standard

part of ISO/IEC 80079

Hand tools and manually operated equipment without energy storage are excluded from the scope of this standard. This standard does not address the safety of

static

fixed

NOTE 1

Static

Fixed

This standard does not specify requirements for safety, other than those directly related to the risk of ignition which may then lead to an explosion. The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that 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.

Such atmospheres can also exist inside the equipment. In addition, the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment’s internal operating pressure, and/or temperature.

NOTE 2 Although the standard atmospheric conditions above give a temperature range for the atmosphere of

–20 °C

NOTE 3 The requirements of this standard can also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above. In this case however, the ignition hazard assessment, ignition protection provided, additional testing (if necessary), manufacturer’s technical documentation and instructions to the user, clearly demonstrate and indicate the equipment’s suitability for the conditions it may encounter. It is also recognized that changes in temperature and pressure can have a significant influence on characteristics of the explosive atmosphere, such as ignitability.

This

standard

part of ISO/IEC 80079

NOTE 4 It is not unusual for equipment designed and constructed in accordance with this standard for a particular EPL to be used in areas requiring an EPL with a higher level of safety by including the application of additional measures. Such measures include for example inerting, suppression, venting or containment or for example by dilution, drainage, monitoring and shut-down. Such measures are outside the scope of this standard.

This standard supplements and modifies the general requirements of

IEC

UL

IEC

UL

This standard is supplemented or modified by the following standards concerning specific types of protection:

–

ISO

UL

–

IEC

UL

–

IEC

UL

–

IEC

UL

The nature and ignition sources of non-electrical equipment shall be considered when applying types of protection "d", "p", or "t" on non-electrical equipment (see Annex G).

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

Clause of

IEC

UL

IEC

UL

Ed 6.0 (2011) (Inf.)

Clause / Sub-Clause Title (Normative)

ISO

UL

ISO

UL

"c"

"b"

"k"

4

Equipment grouping

Modified (see Clause 4)

(*)

(*)

(*)

4.1

Group I

Applies

(*)

(*)

(*)

4.2

Group II

Applies

(*)

(*)

(*)

4.3

Group III

Modified (see 4)

(*)

(*)

(*)

4.4

Equipment for a particular explosive atmosphere

Applies

(*)

(*)

(*)

5

Temperatures

Modified (see 2 and )

(*)

(*)

(*)

5.1

Environmental influences

Applies

(*)

(*)

(*)

5.1.1

Ambient temperature

Applies

to be read as non-electrical equipment

(*)

(*)

(*)

5.1.2

External source of heating or cooling

Applies

to be read as non-electrical equipment

(*)

(*)

(*)

5.2

Service temperature

Applies

to be read as non-electrical equipment

(*)

(*)

(*)

5.3.1

Determination of maximum surface temperature

Modified (see 3) non-electrical

(*)

(*)

(*)

5.3.2.1

Group I electrical equipment

Modified (see 4) non-electrical

(*)

(*)

(*)

5.3.2.2

Group II electrical equipment

Modified (see 5) non-electrical

(*)

(*)

(*)

5.3.2.3

Group III electrical equipment

Modified (see 7) non-electrical

(*)

(*)

(*)

5.3.3

Small component temperature for Group I and Group II electrical equipment

Modified (see 6) non-electrical

(*)

(*)

(*)

6.

Requirements for all electrical equipment

Applies

to be read as non-electrical equipment

(*)

(*)

(*)

6.1

General

Applies

to be read as non-electrical equipment

(*)

(*)

(*)

6.2

Mechanical strength of equipment

Applies

(*)

(*)

(*)

6.3

Opening times

Modified (see 3)

(*)

(*)

(*)

6.4

Circulating currents in enclosures (e.g. of large electrical machines)

Applies

(*)

(*)

(*)

6.5

Gasket retention

Applies

(*)

(*)

(*)

6.6

Electromagnetic and ultrasonic energy radiating equipment

Excluded

–

–

–

7

Non-metallic enclosures and non-metallic parts of enclosures

Applies

(*)

(*)

(*)

7.1

General

Applies

(*)

(*)

(*)

7.1.1

Applicability

Applies

(*)

(*)

(*)

7.1.2

Specification of materials

Applies

(*)

(*)

(*)

7.2

Thermal endurance

Applies

(*)

(*)

(*)

7.3

Resistance to light

Applies

(*)

(*)

(*)

7.4

Electrostatic charges on external non-metallic materials

Modified (see 4, 5 and 6)

(*)

(*)

(*)

7.5

Accessible metal parts

Applies

(*)

(*)

(*)

8

Metallic enclosures and metallic parts of enclosures

Modified (see 1 Footnote 1) and ref. to ISO 6507-1

(*)

(*)

(*)

8.1

Material composition

Modified (see 1 Footnote 1) and ref. to ISO 6507-1

(*)

(*)

(*)

8.2

Group I

Modified (see 1 Footnote 1) and ref. to ISO 6507-1

(*)

(*)

(*)

8.3

Group II

Modified (see 1 Footnote 1) and ref. to ISO 6507-1

(*)

(*)

(*)

8.4

Group III

Modified (see 1 Footnote 1) and ref. to ISO 6507-1

(*)

(*)

(*)

9

Fasteners

Excluded

–

–

–

10

Interlocking devices

Excluded

–

–

–

11

Bushings

Excluded

–

–

–

12

Materials used for cementing

Applies (see 6)

(*)

(*)

(*)

13

Ex Components

Applies

(*)

(*)

(*)

14

Connection facilities and termination compartments

Excluded

–

–

–

15

Connection facilities for earthing or bonding conductors

Excluded

–

–

–

16

Entries into enclosures

Excluded

–

–

–

17

Supplementary requirements for rotating machines

Excluded

–

–

–

18

Supplementary requirements for switchgear

Excluded

–

–

–

19

Supplementary requirements for fuses

Excluded

–

–

–

20

Supplementary requirements for plugs, socket outlets and connectors

Excluded

–

–

–

21

Supplementary requirements for luminaires

Excluded

–

–

–

22

Supplementary requirements for caplights and handlights

Excluded

–

–

–

23

Equipment incorporating cells and batteries

Excluded

–

–

–

24

Documentation

Modified (see 9)

(*)

(*)

(*)

25

Compliance of prototype or sample with documents

Applies

(*)

(*)

(*)

26

Type Tests

Modified (see 8)

(*)

(*)

(*)

26.1

General

Applies

(*)

(*)

(*)

26.2

Test configuration

Applies

to be read as non-electrical equipment

(*)

(*)

(*)

26.3

Tests in explosive test mixtures

Applies

(*)

(*)

(*)

26.4.1

Order of tests

Excluded

–

–

–

26.4.2

Resistance to impact

Applies (see 1)

(*)

(*)

(*)

26.4.3

Drop test

Applies (see 2)

(*)

(*)

(*)

26.4.4

Acceptance criteria

Applies (see 3

(*)

(*)

(*)

26.4.5

Degree of protection (IP) by enclosure

Applies

(*)

(*)

(*)

26.5.1.1

General

Applies

(*)

(*)

(*)

26.5.1.2

Service temperature

Applies

(*)

(*)

(*)

26.5.1.3

Maximum surface temperature

Modified (see 2)

(*)

(*)

(*)

26.5.2

Thermal shock test

Applies

(*)

(*)

(*)

26.5.3

Small component ignition test (Group I and Group II)

Excluded

–

–

–

26.6

Torque test for bushings

Excluded

–

–

–

26.7

Non-metallic enclosures or non-metallic parts of enclosures

Applies

(*)

(*)

(*)

26.8

Thermal endurance to heat

Applies (see 4)

(*)

(*)

(*)

26.9

Thermal endurance to cold

Applies (see 5)

(*)

(*)

(*)

26.10

Resistance to light

Applies

(*)

(*)

(*)

26.11

Resistance to chemical agents for Group I electrical equipment

Applies (see 6)

(*)

(*)

(*)

26.12

Earth continuity

Excluded

–

–

–

26.13

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

Applies

(*)

(*)

(*)

26.14

Measurement of capacitance

Excluded

–

–

–

26.15

Verification of ratings of ventilating fans

Excluded

–

–

–

26.16

Alternative qualification of elastomeric sealing O-rings

Applies

(*)

(*)

(*)

27

Routine tests

Applies

(*)

(*)

(*)

28

Manufacturer's responsibility

Modified (see 1)

(*)

(*)

(*)

29

Marking

Modified (see 11)

(*)

(*)

(*)

30

Instructions

Modified (see 10)

(*)

(*)

(*)

30.1

General

Applies

(*)

(*)

(*)

30.2

Cells and batteries

Excluded

–

–

–

30.3

Electrical machines

Excluded

–

–

–

30.4

Ventilating fans

Excluded

–

–

–

(*) This requirement concerns also equipment protected by types of protection "c", "b" and "k".

Applies – This requirement of

IEC

UL

Excluded – This requirement of

IEC

UL

Modified – This requirement of

IEC

UL

DE The applicable requirements of

IEC

UL

IEC

UL

2011

2013

IEC

UL

2007

2009

or UL 60079-0 Ed. 7.0:2019