Page 16 - Electrical Installation in Hazardous Area

Contents xiii

15.5 Specific additional requirements for 466
particular types of electrical apparatus and connections
15.5.1 Connection facilities 466
15.5.2 Cable and conduit entries 467
15.5.3 Fuses and switchgear 467
15.5.4 Plugs and sockets 468
15.5.5 Luminaires and similar apparatus 468
15.6 Apparatus conforming to the protection concepts
appropriate to gas, vapour and mist risks 468
15.6.1 Spark ignition 469
15.6.2 Hot surface ignition 469
15.6.3 Basis of selection of apparatus with protection
concepts appropriate to gas/vapour/mist and
air risks 469
16 Other methods of protection and future apparatus
requirements 474
16.1 Acceptance of technical requirements 475
16.2 Essential requirements 476
16.2.1 General requirements 476
16.2.2 Materials of construction 478
16.2.3 General design and constructional
requirements 479
16.2.4 Specific requirements for particular
types of apparatus and protective systems 479
16.3 Use of apparatus 481
17 Selection of power supply, apparatus and interconnecting
cabling system for both gas/vapour/mist risks and dust risks
482
17.1 Electrical supply systems 482
17.2 Electrical protection 485
17.3 Selection of apparatus 486
17.3.1 Selection in respect of gases, vapours
and mists 487
17.3.2 Selection of apparatus for dust risks 491
17.3.3 Selection on the basis of zone of risk 493
17.4 Selection of conduit or cable systems 497
17.4.1 Zone 0 and Zone 20 498
17.4.2 Zone 1 and Zone 21 500
17.4.3 Zone 2 and Zone 22 501
18 Installations in explosive atmospheres of gas, vapour, mist
and dust 503
18.1 Standards and Codes 504