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