AS/NZS 60079.1:2002

1 - AS/NZS 60079.1:2002 ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES - FLAMEPROOF ENCLOSURES 'd'
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Normative references
8 - 3 Definitions
8 - 3.1 flameproof enclosure ‘d’
8 - 3.2 volume
8 - 3.3 flameproof joint
8 - 3.4 width of flameproof joint (L)
9 - 3.5 distance (l)
9 - 3.6 gap of flameproof joint (i)
9 - 3.7 maximum experimental safe gap (MESG) (for an explosive mixture)
9 - 3.8 shaft
9 - 3.9 operating rod
9 - 3.10 pressure-piling
9 - 3.11 quick-acting door or cover
9 - 3.12 door or cover fixed by threaded fasteners
9 - 3.13 threaded door or cover
9 - 3.14 breathing device
10 - 3.15 draining device
10 - 4 Apparatus grouping and temperature classification
10 - 5 Flameproof joints
10 - 5.1 General requirements
10 - 5.2 Non-threaded joints
10 - 5.2.1 Width of joints (L)
10 - 5.2.2 Gap (i)
11 - 5.2.3 Spigot joints
12 - 5.2.4 Holes in joint surfaces
14 - 5.2.5 Conical joints
14 - 5.2.6 Joints with partial cylindrical surfaces (not permitted for Group IIC)
14 - 5.2.7 Additional requirements for joints of electrical apparatus of Group IIC
14 - 5.2.8 Serrated joints
16 - 5.3 Threaded joints
17 - 5.4 Gaskets (including O-rings)
19 - 5.5 Apparatus using capillaries
19 - 6 Cemented joints
19 - 6.1 General
19 - 6.2 Mechanical strength
19 - 6.3 Width of cemented joints
19 - 7 Operating rods
19 - 8 Supplementary requirements for shafts and bearings
19 - 8.1 Joints of shafts
20 - 8.1.1 Cylindrical joints
20 - 8.1.2 Labyrinth joints
20 - 8.1.3 Joints with floating glands
22 - 8.2 Bearings
22 - 8.2.1 Sleeve bearings
22 - 8.2.2 Rolling-element bearings
22 - 9 Light-transmitting parts
22 - 10 Breathing and draining devices which form part of a flameproof enclosure
23 - 10.1 Openings for breathing or draining
23 - 10.2 Composition limits
23 - 10.3 Dimensions
23 - 10.4 Elements with measurable paths
23 - 10.5 Elements with non-measurable paths
23 - 10.6 Removable devices
24 - 10.7 Mounting arrangements of the elements
24 - 10.8 Mechanical strength
24 - 10.9 Breathing devices and draining devices when used as Ex components
24 - 10.9.1 Mounting arrangements of the elements and components
24 - 10.9.2 Type tests for breathing and draining devices used as Ex components
27 - 10.9.3 Marking
27 - 10.9.4 Component certificate
27 - 11 Fasteners, associated holes and closing devices
29 - 12 Materials and mechanical strength of enclosures; materials inside the enclosures
30 - 13 Entries for flameproof enclosures
30 - 13.1 Cable entries
30 - 13.2 Conduit entries
31 - 13.3 Plugs and sockets and cable couplers
31 - 13.4 Bushings
32 - 14 Verification and tests
32 - 15 Type tests
33 - 15.1 Tests of ability of the enclosure to withstand pressure
33 - 15.1.1 General
33 - 15.1.2 Determination of explosion pressure (reference pressure)
34 - 15.1.3 Overpressure test
35 - 15.2 Test for non-transmission of an internal ignition
35 - 15.2.1 Electrical apparatus of Groups I, IIA and IIB
36 - 15.2.2 Electrical apparatus of Group lIC
37 - 15.3 Test for sealing of stopping boxes with setting compound
38 - 15.4 Tests of flameproof enclosures with breathing and draining devices
38 - 15.4.1 Tests of ability of the enclosure to withstand pressure
39 - 15.4.2 Thermal tests
39 - 15.4.3 Test for non- transmission of an internal ignition.
40 - 16 Routine tests
41 - 17 Switchgear for Group I
41 - 17.1 Means of isolation
42 - 17.2 Doors or covers
42 - 17.2.1 Quick-acting doors or covers
42 - 17.2.2 Doors or covers fixed by screws
42 - 17.2.3 Threaded doors or covers
42 - 18 Lampholders and Iampcaps
42 - 18.1 Device preventing lamps working loose
42 - 18.2 Holders and caps for lamps with cylindrical caps
43 - 18.3 Holders for lamps with threaded caps
43 - 19 Non-metallic enclosures and non-metallic parts of enclosures
43 - 19.1 Permitted non-metallic enclosures
43 - 19.2 Special constructional requirements
43 - 19.2.1 Resistance to tracking and creepage distances on internal surfaces of the enclosure walls
43 - 19.3 Supplementary requirements for type tests
44 - 19.3.1 Tests for flameproofness
44 - 19.3.2 Flammability
46 - 19.4 Test report
47 - Annex A - Additional requirements for crimped ribbon elements of breathing and draining devices
48 - Annex B - Additional requirements for elements, with non-measurable paths, of breathing and draining devices
48 - B.1 Sintered metal elements
48 - B.2 Pressed metal wire elements
49 - B.3 Metal foam elements
50 - Annex C - Additional requirements for flameproof cable entries
50 - C1
50 - C2 Constructional requirements
51 - C.3 Type tests

Specifies the requirements for the construction and testing of electrical apparatus with the type of protection flameproof enclosure 'd', intended for use in explosive gas atmospheres. This Standard is identical with and has been reproduced from IEC 60079-1:2001, including Corrigendum 1:2001.

This part of IEC 60079 contains the specific requirements for the construction and testing of electrical apparatus with the type of protection flameproof enclosure d, intended for use in potentially explosive gas atmospheres.

First published as AS/NZS 60079.1:2002.