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telephone provider customer
TCU

information
technology
1’ 3’ installation
protected
2’ 4’

BLITZDUCTOR BXT ML2 BD
180
Figure 6.3.6 Lightning current carrying DEHN equipotential bonding
4 BLITZDUCTOR XT enclosures (DPG LSA) for LSA-2/10 technology
2
BXT ML2 BD 180
1 3
5 kA (10/350 µs)
¨ The lightning current load on the cable was assumed to be
30 kA (10/350 μs).
NT ¨ The resulting symmetrical splitting of the lightning current
to the single cores is 30 kA / 200 cores = 150 A / core.
Figure 6.3.5 Lightning equipotential bonding for the connection of a This means no special requirements are placed on the dis-
telecommunications device by means of BLITZDUCTOR charge capacity of the protection elements to be used. After
XT (use permitted by Deutsche Telekom) flowing through the discharge elements, the partial currents
of all cores add up to 30 kA again and stress, for example,
terminal enclosures, earthing clamps or lightning equipotential
¨ A telecommunications cable with 100 pairs coming from bonding conductors in the discharge path. Lightning-current-
LPZ 0 A is connected in an LSA building distributor and tested enclosure systems can be used to prevent destruction in
should be protected by arresters. the discharge path (Figure 6.3.6).

184 LIGHTNING PROTECTION GUIDE www.dehn-international.com