Brochure/Catalogue

Network forms
Five-conductor systems:
The neutral point of the supply source is earthed (N and
PE). Both conductors must be laid separately and insulated
from the incoming supply onwards. In these systems the PE
(protective earth conductor ) does not carry any operating
current but instead only discharge currents.
TN-S systems
Neutral conductor and protective earth conductor are
separated throughout the network.
Special system:
Used, for example, in medical applications
IT systems
There is no direct connection between active conductors
and earthed parts. The exposed conductive parts of the
electrical installation are earthed.
TT systems
One point is earthed directly (operational earth). The
exposed conductive parts of the electrical installation are
connected to earth lines separate from the operational earth.
W
The basics of lightning and surge protection
W.152028840000