AS 2380.2-1991

1 - AS 2380.2-1991 ELECTRICAL EQUIPMENT FOR EXPLOSIVE ATMOSPHERES - EXPLOSION-PROTECTION TECHNIQUES - FLAMEPROOF ENCLOSURE d
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 REFERENCED DOCUMENTS
7 - 1.3 DEFINITIONS
7 - 1.3.1 Chamfer (f)
7 - 1.3.2 Flameproof enclosure
7 - 1.3.3 Flameproof joint
7 - 1.3.4 Gap (diametral clearance)
7 - 1.3.5 Length of flamepath (width of joint)
7 - 1.3.6 Maximum surface temperature
7 - 1.3.7 Operating rod (spindle)
7 - 1.3.8 Pressure piling
7 - 1.3.9 Shaft
7 - 1.3.10 Time of explosion
7 - 1.3.11 Volume
7 - 1.4 GROUPING
7 - 1.5 TEMPERATURE CLASSIFICATION
10 - SECTION 2 CONSTRUCTIONAL REQUIREMENTS
10 - 2.1 GENERAL
10 - 2.2 NON-THREADED JOINTS
10 - 2.2.1 General
10 - 2.2.2 Width of joints
10 - 2.2.3 Surface roughness
10 - 2.2.4 Gap
10 - 2.2.5 Spigot joints
10 - 2.2.6 Flanged joints for Group IIC
10 - 2.2.7 Holes in joint surfaces
11 - 2.3 THREADED JOINTS
11 - 2.4 GASKETS AND O-RINGS
11 - 2.5 CEMENTED JOINTS
12 - 2.6 OPERATING RODS (SPINDLES)
12 - 2.7 SHAFTS AND BEARINGS
12 - 2.7.1 Provision of gland
12 - 2.7.2 Sleeve bearings
12 - 2.7.3 Rolling-element bearings
12 - 2.7.4 Plain glands
12 - 2.7.5 Labyrinth glands
12 - 2.8 LIGHT TRANSMITTING PARTS
12 - 2.8.1 Material
12 - 2.8.2 Mounting
13 - 2.8.3 Light transmitting parts for luminaires
13 - 2.9 BREATHING AND DRAINING DEVICES
13 - 2.10 FASTENERS
13 - 2.10.1 Removable screws or studs
13 - 2.10.2 Blinding of holes
13 - 2.10.3 Permanently attached screws or studs
13 - 2.10.4 Washers
13 - 2.10.5 Group I enclosures
13 - 2.11 MECHANICAL STRENGTH OF THE ENCLOSURE
14 - 2.12 CONNECTION OF CONDUCTORS AND CABLES
14 - 2.12.1 General
14 - 2.12.2 Indirect entry
14 - 2.12.3 Direct entry
14 - 2.12.4 Threaded entries
14 - 2.13 PLUGS AND SOCKET-OUTLETS
14 - 2.13.1 General
15 - 2.13.2 Interchangeability
15 - 2.13.3 Construction-Group I
15 - 2.13.4 Construction-Group II
24 - SECTION 3 MARKING
24 - 3.1 GENERAL
25 - SECTION 4 VERIFICATION AND TESTS
25 - 4.1 GENERAL
25 - 4.2 TYPE TESTS
25 - 4.2.1 General
25 - 4.2.2 Tests of ability of the enclosure to withstand pressure
25 - 4.2.3 Determination of explosion pressure (reference pressure)
25 - 4.2.4 Over pressure test
26 - 4.2.5 Tests for non-transmission of an internal ignition
27 - 4.3 ROUTINE TESTS
27 - 4.3.1 General
27 - 4.3.2 Dynamic test
27 - 4.3.3 Reference pressure
27 - 4.3.4 Criteria of compliance
29 - APPENDIX A - SOCKET CONTACT AND PLUG PIN CONFIGURATIONS AND DIMENSIONS (GROUP II ONLY)
33 - APPENDIX B - BREATHING AND DRAINING DEVICES
33 - B1 GENERAL
33 - B2 CONSTRUCTION
33 - B2.1 General
33 - B2.2 Elements with measurable parts
33 - B2.3 Additional requirements for crimped ribbon elements of breathing and drainage devices
33 - B2.4 Elements with non-measurable parts
34 - B2.5 Integrity
34 - B3 MOUNTING ARRANGEMENTS OF ELEMENTS
34 - B4 MECHANICAL STRENGTH
34 - B5 TESTS OF FLAMEPROOF ENCLOSURE WITH BREATHING AND DRAINING DEVICES
34 - B5.1 Tests of ability of the enclosure to withstand pressure
35 - B5.2 Test for non-transmission of an internal ignition
35 - B5.3 Thermal tests
36 - APPENDIX C NON-METALLIC ENCLOSURES AND NON-METALLIC PARTS OF ENCLOSURES
36 - C1 GENERAL
36 - C2 SCOPE
36 - C3 PERMITTED NON-METALLIC ENCLOSURES
36 - C4 SPECIAL CONSTRUCTIONAL REQUIREMENTS
36 - C4.1 Resistance to tracking and creepage distances on internal surfaces of the enclosure walls
36 - C5 SUPPLEMENTARY REQUIREMENTS FOR TESTS
36 - C5.1 GENERAL TESTS
36 - C5.1.1 Ambient temperatures during tests
37 - C5.1.2 Sequence of tests
37 - C5.1.3 Thermal endurance to heat
37 - C5.1.4 Thermal endurance to cold
37 - C5.1.5 Resistance to light
37 - C5.1.6 Resistance to chemical agents for Group 1 electrical apparatus
37 - C5.2 TEST FOR FLAMEPROOFNESS
37 - C5.2.1 General
37 - C5.2.2 Tests of ability of the enclosure to withstand pressure
38 - C5.2.3 Test of erosion by flame
38 - C5.2.4 Test for non-transmission of an internal ignition
38 - C5.3 Test for flammability
38 - C5.4 Test Report
38 - C6 TESTS FOR CABLE ENTRIES AND STEPPING BOXES

Specifies the design, construction and testing requirements for the flameproof enclosure of electrical equipment for use in explosive atmospheres. Technically equivalent to IEC 79-1.

This Standard specifies requirements for the flameproof enclosure of electrical equipment, type of protection d, intended for use in hazardous areas.The Standard provides for the grouping of enclosures according to the dimensions of the gaps between joint surfaces, and an indication is given of the explosive gas atmosphere for which each group is appropriate. Some additional requirements may be necessary for non-metallic materials and these are left to the discretion of the testing authority (see Appendix C).This Standard does not apply to enclosures kept charged with air or other non-flammable gas so as to prevent the entry of flammable gas, or to enclosures containing hydrocarbon oil and parts of equipment into which gaseous products from the oil may enter.Electrical equipment with type of protection d shall be designed for operation within the ambient temperature range specified in AS 2380.1. For ambient temperatures below -20C, stronger enclosures may be required due to the higher explosion pressures generated at low temperatures and the possibility of brittle failure of enclosure materials. For ambient temperatures above 60C, it may be necessary to use smaller joint gaps because the maximum safe gap tends to decrease with an increase in ambient temperature.The specific requirements in this Standard are additional to the general requirements in AS 2380.1, except for Clause 2.11.2 which does not apply.

First published in part as AS C98-1961.
Second edition 1970.
Revised and redesignated AS 2480-1981.
AS C99 first published 1970.
Revised and redesignated AS 2034-1977.
Second edition 1982.
AS 2480-1981 and AS 2034-1982 revised, amalgamated and issued as AS 2480-1986.
Revised and redesignated AS 2380.2-1991.