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4
After the faulty cable has been disconnected and verified to be
dead, the high voltage lead can be connected. For this
purpose, the wire clamp is fixed to the faulty phase conductor,
whereby care should be taken to ensure a good contact. The
sheath clamp is screwed onto the sheath or screen of the
defective cable. Additionally, in the case of a fault between
two cores, one of these cores has to be connected to the
sheath or screen and in the event of plastic cables, to systems
earth.
2.4
Isolation of open cable ends
Since the high voltage impulses applied to the defective cable
assume dangerous values, the cable ends must be isolated as
per VDE 0104 in order to avoid physical contact. This also
goes for teed low voltage cables which, if need be, have to be
disconnected in order to avoid flashovers in the installations or
terminal boxes.
Only when dealing with longer cables (exceeding 100 m) it is
recommended to short-circuit and earth one cable end. In
spite of the shorted conductors, a flashover can be obtained at
the fault.
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