UL 60079-30-1:2021

1 Scope

This

part of IEC 60079

standard

specifies general and testing requirements for electrical resistance trace heaters for application in explosive atmospheres with the exclusion of those for EPL Ga and Da. This standard covers trace heaters that comprise either factory or field (work-site) assembled units, and which may be series trace heaters, parallel trace heaters, trace heater pads, or trace heater panels that have been assembled and/or terminated in accordance with the manufacturer’s instructions.

This standard also includes requirements for termination assemblies and control methods used with trace heating systems. The explosive atmospheres referred to in this standard are those defined in IEC 60079-10-1 and IEC 60079-10-2.

Annexes D and E outline the application of this standard for those users applying the Division method of area classification.

This standard supplements and modifies the general requirements of

IEC 60079-0

UL 60079-0

, except as indicated in . Where a requirement of this standard conflicts with a requirement of

IEC 60079-0

UL 60079-0

, the requirement of this standard takes precedence.

Where references are made to other IEC 60079 standards, the reference requirements found in these standards apply as modified by any applicable U.S. National Differences.

IEC

UL

60079-0

Electrical resistance trace heaters and integral components

Terminations as separate components

Ed. 6.0 (2011)

(informative)

Clause / Subclause title (normative)

Group I and Group II

Group III

1

Scope

Applies

Applies

Applies

2

Normative references

Applies

Applies

Applies

3

Terms and definitions

Applies, except ambient temperature, see 1

Applies, except ambient temperature, see 1

Applies, except ambient temperature, see 1

4

Equipment grouping

Applies

Applies

Applies

4.1

Group I

Applies

Excluded

Applies

4.2

Group II

Applies, always IIC

Excluded

Applies

4.3

Group III

Excluded

Applies, outside of thermal insulation only, always IIIC

Applies, outside of thermal insulation only

4.4

Equipment for a particular explosive atmosphere

Excluded

Excluded

Applies

5.1

Environmental influences

Applies

Applies

Applies

5.1.1

Ambient temperature

Replaced by 1e)

Replaced by 1e)

Applies, see 1

5.1.2

External source of heating or cooling

Applies

Applies

Applies

5.2

Service temperature

Modified

Modified

Applies

5.3.1

Determination of maximum surface temperature

Replaced by 5 in conjunction with 13

Replaced by 5 in conjunction with 13 only when tested in accordance with 3.

Applies

5.3.2.1

Group I electrical equipment

Applies

Excluded

Applies

5.3.2.2

Group II electrical equipment

Applies

Excluded

Applies

5.3.2.3.1

Group III electrical equipment, Maximum surface temperature determined without a dust layer

Excluded

Applies, where the maximum sheath temperatures determined by IEC/IEEE 60079-30-1 are used in place of the method for temperature determination from

IEC 60079-0

UL 60079-0

.

Applies

5.3.2.3.2

Group III electrical equipment Maximum surface temperature with respect to dust layers

Excluded

Applies, where the maximum sheath temperature is determined only for those surfaces that are specified to be exposed to layers of combustible dust.

Applies

Does not apply for trace heaters specified to be covered by thermal insulation.

5.3.3

Small component temperature for Group I and Group II electrical equipment

Excluded

Excluded

Applies

6.1

Requirements for all electrical equipment – General

Applies

Applies

Applies

6.2

Mechanical strength

Replaced by 2

Replaced by 2

When in direct contact with the trace heater, may be substituted by 2

6.3

Opening times

Excluded

Excluded

Applies

6.4

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

Excluded

Excluded

Excluded

6.5

Gasket retention

Excluded

Excluded

Applies

6.6

Electromagnetic and ultrasonic radiating equipment

Excluded

Excluded

Applies

7.1.1

Non-metallic enclosures and non-metallic parts of enclosures – Applicability

Replaced by the last paragraph of 1

Replaced by the last paragraph of 1

Applies

7.1.2.1

Specification of materials, General

Replaced by the last paragraph of 1

Replaced by the last paragraph of 1

Applies

7.1.2.2

Specification of materials, plastic materials

Replaced by the last paragraph of 1

Replaced by the last paragraph of 1

Applies

7.1.2.3

Elastomers

Replaced by the last paragraph of 1

Replaced by the last paragraph of 1

Applies

7.2

Thermal endurance

Replaced by requirements and tests of this standard

Replaced by requirements and tests of this standard

Applies

7.3

Resistance to light

Replaced by 16 for trace heaters and integral components specified for outdoor exposure

Replaced by 16 for trace heaters and integral components specified for outdoor exposure

Applies

7.4.1

Electrostatic charges on external non-metallic materials, Applicability

Excluded

Excluded

Applies

7.4.2

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

Excluded

Excluded

Applies

7.4.3

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

Excluded

Excluded

Applies

7.5

Accessible metal parts

Excluded

Excluded

Applies

8.1

Material composition

Excluded

Excluded

Applies

8.2

Group I

Excluded

Excluded

Applies

8.3

Group II

Excluded

Excluded

Applies

8.4

Group III

Excluded

Excluded

Applies

9

Fasteners

Excluded

Excluded

Applies

10

Interlocking devices

Excluded

Excluded

Applies

11

Bushings

Excluded

Excluded

Applies

12

Materials used for cementing

Replaced by the last paragraph of 1

Replaced by the last paragraph of 1

Applies

13

Ex Components

Applies

Applies

Applies

14

Connection facilities and termination compartments

Covered by the requirements of this standard

Covered by the requirements of this standard

Applies

15

Connection facilities for earthing and bonding conductors

Replaced by 15

Replaced by 15

Applies

16

Entries into enclosures

Excluded

Excluded

Applies

17

Supplementary requirements for rotating electrical machines

Excluded

Excluded

Excluded

18

Supplementary requirements for switchgear

Excluded

Excluded

Excluded

19

Supplementary requirements for fuses

Excluded

Excluded

Applies

20

Supplementary requirements for plugs and sockets

Excluded

Excluded

Applies

21

Supplementary requirements for luminaires

Excluded

Excluded

Excluded

22

Supplementary requirements for caplights and handlights

Excluded

Excluded

Excluded

23

Equipment incorporating cells and batteries

Excluded

Excluded

Applies

24

Documentation

Applies

Applies

Applies

25

Compliance of prototype or sample with documents

Applies

Applies

Applies

26.1

General

Applies

Applies

Applies

26.2

Test configuration

Applies

Applies.

Applies

26.3

Tests in explosive test mixtures

Excluded

Excluded

Applies

26.4

Tests of enclosures

Excluded

Excluded

Applies

26.4.1

Order of tests

Excluded

Excluded

Applies

26.4.1.1

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

Excluded

Excluded

Applies

26.4.1.2

Non-metallic enclosures or non-metallic parts of enclosures

Excluded

Excluded

Applies

26.4.2

Resistance to impact

Replaced by 5

Replaced by 5

Applies

26.4.3

Drop test

Excluded

Excluded

Excluded

26.4.4

Acceptance criteria

Replaced by 5

Replaced by 5

Applies

26.4.5

Degree of protection by enclosure

Replaced by 8 and/or 9

Replaced by 8 and/or 9

Applies

26.5

Thermal tests

Modified.

Modified

Applies

26.5.1

Temperature measurement

Replaced by 13

Replaced by 13

Applies

26.5.2

Thermal shock test

Excluded

Excluded

Applies

26.5.3

Small component ignition test

Excluded

Excluded

Applies

26.6

Torque test for bushings

Excluded

Excluded

Applies

26.7

Non-metallic enclosures or non-metallic parts of enclosures

Excluded

Excluded

Applies

26.8

Thermal endurance to heat

Replaced by 11

Replaced by 11

Applies

26.9

Thermal endurance to cold

Replaced by 7

Replaced by 7

Applies

26.10

Resistance to light

Replaced by 16 for trace heaters and integral components specified for outdoor exposure

Replaced by 16 for trace heaters and integral components specified for outdoor exposure

Applies

26.11

Resistance to chemical agents for Group I electrical equipment

Applies for Group I

Excluded

Applies

26.12

Earth continuity

Excluded

Excluded

Applies

26.13

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

Excluded

Excluded

Applies

26.14

Measurement of capacitance

Excluded

Excluded

Applies

26.15

Verification of ratings of ventilating fans

Excluded

Excluded

Excluded

26.16

Alternative qualification of elastomeric sealing O-rings

Excluded

Excluded

Applies

27

Routine tests

Applies

Applies

Applies

28

Manufacturers responsibility

Applies

Applies

Applies

29

Marking

Modified

Modified

Applies

30

Instructions

Modified

Modified

Applies

Annex A

Supplementary requirements for Ex cable glands

Excluded

Excluded

Applies

Annex B

Requirements for Ex components

Excluded

Excluded

Applies

Annex C

Example of rig for resistance to impact test

Replaced by 5

Replaced by 5

Applies

Annex D

Motors supplied by converters

Excluded

Excluded

Excluded

Annex E

Temperature rise testing of electric machines

Excluded

Excluded

Excluded

Annex F

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

Excluded

Excluded

Applies

NOTE 1 Clause numbers in the three right-hand columns of this table refer to IEC/IEEE 60079-30-1

NOTE 2 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.

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.

Published Code	UL
Published By	Underwriters Laboratories Inc.
Publication Date	2021-08-11
Pages Count	88
Language	English
Edition	1
File Size	1.3 MB