Western Telematic - TAN-1005

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Contents

991 115 03 99 Application Note TAN 1005 Surge Suppression for Zone 0 Locations Synopsis This note discusses the surge protection requirements of intrinsically safe circuits entering a Zone 0 hazardous area It analyses the potential gradients generated by lightning strikes and their possible routes of invasion The alleviation of the problem at the zone 0 interface transfers the problem elsewhere and an adequately safe pragmatic solution is proposed Hfll A member of The MTL Instruments Group pic Telematic CONTENTS 1 INTRODUCTION 2 INTRINSIC SAFETY REQUIREMENTS FOR EARTHING AND BONDING 3 CERTIFICATION OF SURGE SUPPRESSORS 4 PROTECTION OF THE SENSOR AND TRANSMITTER 5 PROTECTION OF THE GALVANIC ISOLATOR AND SAFE AREA EQUIPMEN ...