with the metal housing the
switchgear cabinet)
TBS
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197
Chapter The internal lightning protection system
.
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.
A pulse current 8/20 gener-
ates voltage drop per metre of
cable.
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 the cables are longer than 0.g.5 wiring
must selected
