Because surge voltages can occur even without light-
ning, for example due switching operations the
supply network, terminal devices and cables always
need have certain amount voltage resistance
to enable the device cable remain operation
following brief surge voltage.9: Voltage resistance components
TBS
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Chapter The internal lightning protection system
.5 kV
<120 V
<700 V
Installation data cable J-Y(ST)Y
• Wire-wire
• Wire-shield
0.5 800 V
50 Ohm coaxial cable 800 V
75 Ohm SAT coaxial cable 800 V
J BMK (JB-YY) fire alarm cable
• Wire-wire
• Wire-shield
0.
Application Typical voltage resistance
OBO surge protection
protection level
Telecoms terminals/devices 1.8 kV
< V
< 600 V
Table 3.5 kV
Profibus cable 1.5 kV
2 kV
< V
< 800 V
Installation cable tube wire intercoms
• Wire-wire
• Wire-shield
1 kV
1 kV
< V
< 600 V
CAT7 cable
• Wire-wire
• Wire-shield
2.5 600 V
Measurement/control terminals 600 V
Telephone device cable (star quad)
• Wire-wire
• Wire-shield
0.1.8 kV
0.5 kV
2 kV
< 300 V
< 300 V
Installation cable telecommunication systems (F-vYAY)
• Wire-wire
• Wire-shield
0. The following table
shows typical voltage resistance values for common
terminal devices/cables. Transients and light-
ning currents can transmitted the lightning dir-
ectly, via cables which interference factors are
already coupled.5 kV
2.TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
3.3.5 kV
2 kV
< V
< 800 V
Jumper wire telecoms distribution board 2.2 Interference information technology sys-
tems
Lightning currents and surge voltages can coupled
into data cables different ways.
Electrical components have spe-
cific voltage resistance
