6
7
6
The installation shall be done following the local wiring rules suggesting to work all
power off. Prior to installation of THF on PEN
−
conductor between point A and B
following measures must be taken.
Installation to TN-C-S
-
THF in N-conductor of the TN-S- part
The installation shall be done following the local wiring rules suggesting to work
all power off. Prior to installation of THF on N –conductor between point A
and B following measures must be taken.
Prior to installation of THF in
N-conductor of one of the TN-S-
parts, resistance measurements
must be carried out between the
downstream (building) earth &
neutral to ensure that no erroneous
earth/neutral connection exists
other than that intended to achieve
a TN-S-system. Such accidental
connection could cause excessive
current to flow in the system earth
and overheating of cables.
The procedure is the same as in
the TN-S-system described in this
instruction.
Summary of Contents for THF 1BS Series
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