UL 80079-36:2021

1 Scope

This

standard

part of ISO/IEC 80079

specifies the basic method and requirements for design, construction, testing and marking of non-electrical Ex equipment, Ex Components, protective systems, devices and assemblies of these products that have their own potential ignition sources and are intended for use in explosive atmospheres.

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

autonomous process equipment when it is not part of equipment referred to in this standard.

NOTE 1

Static

Fixed

autonomous process equipment includes items such as tanks, vessels, fixed pipework and hand operated valves which do not have their own source of energy that could create a potential ignition source during operation.

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

to +60 °C, the normal ambient temperature range for the equipment is –20 °C to +40 °C, unless otherwise specified and marked. It is considered that –20 °C to +40 °C is appropriate for most equipment and that to manufacture all equipment to be suitable for a standard atmosphere upper ambient temperature of +60 °C would place unnecessary design constraints.

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

specifies the requirements for the design and construction of equipment, intended for explosive atmospheres in conformity with all Equipment Protection Levels (EPLs) of Group I, II and III.

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

60079-0, as shown in . Where a requirement of this standard conflicts with a requirement of

IEC

UL

60079-0, as far as applicable for non-electrical equipment, the requirement of this standard takes precedence.

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

–

ISO

UL

80079-37, Explosive atmospheres – Part 37: Non-electrical equipment for explosive atmospheres – Non-electrical type of protection constructional safety "c", control of ignition source "b", liquid immersion "k"

–

IEC

UL

60079-1, Explosive atmospheres – Part 1: Equipment protection by flameproof enclosures "d"

–

IEC

UL

60079-2, Explosive atmospheres – Part 2: Equipment protection by pressurized enclosures "p"

–

IEC

UL

60079-31, Explosive atmospheres – Part 31: Equipment dust ignition protection by enclosure "t"

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

60079-0

IEC

UL

60079-0 application to

Ed 6.0 (2011) (Inf.)

Clause / Sub-Clause Title (Normative)

ISO

UL

80079-36

ISO

UL

80079-37

"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

60079-0 is applied without change.

Excluded – This requirement of

IEC

UL

60079-0 does not apply.

Modified – This requirement of

IEC

UL

60079-0 is modified as detailed in this standard.

DE The applicable requirements of

IEC

UL

60079-0 are identified by the clause title which is normative. This document was written referring to the specific requirements of

IEC

UL

60079-0 Ed. 6.0:

2011

2013

, The clause numbers for the 6th edition are shown for information only. This is to enable the General Requirements

IEC

UL

60079-0 Ed. 5.0:

2007

2009

or UL 60079-0 Ed. 7.0:2019

to be used where necessary with this part of ISO 80079. Where there were no requirements for the 5th edition or where there is a conflict between requirements, the 6th edition requirements should be considered.

Published Code	UL
Published By	Underwriters Laboratories Inc.
Publication Date	2021-06-23
Pages Count	100
Language	English
Edition	1
File Size	1.1 MB