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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