A pulse current 8/20 gener-
ates voltage drop per metre of
cable.
In accordance with IEC installation directives, the
length the branch cable the arrestor and the
length the line from the protection device the
equipotential bonding should, total, less than
0.5 the cables are longer than 0.
Solution options:
• Installation second SPD near to
the resource protected
• Use wiring
• Local equipotential bonding
(e.TBS
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V wiring surge arrestor according IEC 60634-5-53 lightning current Utotal
= surge voltage protection
device)
The connection cable the protection device cru-
cial for achieving optimum protection level.5 wiring
must selected. with the metal housing the
switchgear cabinet)
TBS
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197
Chapter The internal lightning protection system
.g
