WTI TAN-1005 - Manual
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Table of Contents:
- Page 2 – Application Notes from Telematic
- Page 3 – INTRODUCTION
- Page 4 – CERTIFICATION OF SURGE SUPPRESSORS
- Page 8 – Telematic; Telematic Limited
Telematic
A member of The MTL
Instruments Group plc
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.
991.115
03/99
Application Note
TAN 1005
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Summary
CONTENTS PAGE 1 INTRODUCTION ........................................................................................................................... 1 2 INTRINSIC SAFETY REQUIREMENTS FOR EARTHING AND BONDING ............................................... 2 3 CERTIFICATION OF SURGE SUPPRESSORS ....
SURGE SUPPRESSION FORZONE 0 LOCATIONS tal requirement of all the methods of protection used for power equip-ment. It is not usual for lightning induced current to directly cause enoughheating to create a hazard by temperature ignition, since the currentpulses are too short to create a sustained high...
tion from this possibility or sited with care in the shelter of some otherprotrusion. The diagram shows a two wire 4 to 20 milliamp transmitterwith internal isolation fed from a galvanic isolator. To establish theorder of the problem some assumptions are made which cannot befully justified but are b...
