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User Guide
Fault no. 1 and no. 3: Conductor is (L or N) disconnected and screen/conductor short circuit
A poor connection can be measured through the
heating conductor (infinite or too high resistance). A
finite resistance between screen and conductor may
be measured.
In this case the short circuit between conductor and
screen is used for tracing. No burning is required.
Fault no. 1 and no. 4: Conductor is (L or N) disconnected and screen/conductor short circuit
No connection is measured in the heating conductor
(infinite or too high resistance). The insulation resistance
also shows a fault, and it is possible to measure a finite
resistance between conductor and screen.
Fault no. 4 and no. 5 : All three conductors (L, N, screen) short circuit
The resistance of the heating cable is reduced depending
on the distance between cold cable and fault.
As shown in the examples it is recommended to use the authorised cable testing equipment to facilitate the
choice of the troubleshooting process.
In some cases you may go directly to tracing, and in some cases you will need to burn the necessary connection
for use in the tracing process.
For appropriate use of the equipment, please proceed to the next section.
BC421332622232fr-FR0101
DEVItector™ II V2
By measuring the resistance between the screen
and the two conductors (L and N), you may be able
to locate the heating conductor having the shortest
distance to the fault.
In this case the connection between conductor and
screen is used for tracing.
The resistance between screen and anyone conductor
is finite, signifying a short circuit. In this case, the
tracing may be carried out using any two conductors
of the heating cable.
2022.07 | FEC | ©Danfoss | 19
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