Contents Preface	 IEC	Preface	 IEC	Introduction	 1.	Scope 	 2.	Cited Standards	 3.	Definition	 4.	General Rules	 4.1	General Requirements	 4.2	Documents	 5.	Selection of electrical apparatus (including cable	and conduit)	 5.1	Specific documents	 5.2	Selection according to area classification	 5.3	Selection according to ignition temperature of gas or vapor	 5.4	Selection According To The Category Of Electrical Apparatus	 5.5	External Influences	 6.	Prevention of hazardous spark	 6.1	hazard arising from active parts	 6.2	Hazard Arising From Bare External Conductor	Components	 6.3	Isopotential connection	 6.4	Static electricity	 6.5	Lightning-proofi	 6.6	Electromagnetic radiation	 6.7	Cathode protective metal parts	 7.	Electrical protection	 8.	Emergency switch-off and electrical isolation	 8.1	Emergency switch-off 8.2	Electrical isolation	 9.	Wiring system	 9.1	General	 9.2	Cable system in Zone 0 9.3	Cable system in Zone  9.4	Conduit system	 10.	Additional requirements for explosion-proof enclosure “d” 	 10.1	Solid barrier 	 10.2	Protection Of Explosion-Proof Surface	 10.3	Cable introducing system	 10.4	Motor Powered By Frequency Conversion And Voltage Adjustment Power Supply- 10.5	Conduit system	 11.	Complementary requirements for safety-increasing “e” explosion-proof type 11.1	Protective class of enclosure	 11.2	Squirrel-cage induction motor—thermal protection during	operation	 11.3	Wiring system	 11.4	Resistance heater	 12.	Additional requirements for intrinsic-safety “i” 	 12.1	Introduction	 12.2.	Installation in Zone 1 and Zone 2	 12.3	Installation in Zone 0	36 13.	Complementary requirements for electrical apparatus of positive-pressure type “p” 	 13.1	Piping	 13.2	Measures To Be Taken For Positive-Pressure Failure	 13.3	Multiple positive-pressure enclosures sharing one safety device	 13.4	Purge	 14.	Complementary requirements for equipment used in Zone 2	 14.1	Protective class of enclosure	 14.2	Energy limiting device and circuit	 14.3	Wiring system	 14.4	Motor powered by frequency conversion and voltage adjustment power supply" Appendix A (Appendix for this Standard) Inspection of intrinsic-safety circuit for associated apparatus characterized by more than one linear current/voltage	41 Appendix B (appendix for the prompt) Measurement methods of maximum current and maximum voltage for intrinsic-safety circuit system of associated apparatus characterized by more than one linear current/voltage	
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