8 kV
< V
< 600 V
Table 3.5 kV
2.3. Transients and light-
ning currents can transmitted the lightning dir-
ectly, via cables which interference factors are
already coupled. The following table
shows typical voltage resistance values for common
terminal devices/cables.
Application Typical voltage resistance
OBO surge protection
protection level
Telecoms terminals/devices 1.5 kV
2 kV
< 300 V
< 300 V
Installation cable telecommunication systems (F-vYAY)
• Wire-wire
• Wire-shield
0.8 kV
0.5 600 V
Measurement/control terminals 600 V
Telephone device cable (star quad)
• Wire-wire
• Wire-shield
0.TBS
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3.5 kV
Profibus cable 1.1.2 Interference information technology sys-
tems
Lightning currents and surge voltages can coupled
into data cables different ways.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.
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.
Electrical components have spe-
cific voltage resistance.9: Voltage resistance components
TBS
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219
Chapter The internal lightning protection system
.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
0.5 kV
<120 V
<700 V
Installation data cable J-Y(ST)Y
• Wire-wire
• Wire-shield
0.5 kV
2 kV
< V
< 800 V
Jumper wire telecoms distribution board 2
