Chauvin Arnoux C.A 6681 Notice De Fonctionnement page 54

English
3.2.5 DETECTION OF THE CONSTRICTED (PLUGGED) PART OF A NON-
METALLIC PIPE
Preconditions:
The pipe must be made of a non-conducting material (such as plastic);
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The pipe must not be live;
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The transmitter is connected to a metallic helical tube (flexible metallic tube or
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pipe) and to an auxiliary earth as shown in Fig. 14;
The measurement method is identical to that used in §3.1 Getting started
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Remarks:
If there is a current in the pipe, cut off its supply and connect it correctly to
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earth when the pipe is not live.
One end of the pipe must be correctly earthed, and the earth of the
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transmitter must be at a certain distance from the pipe to be located. If the
estimated distance is too short, the signal and the circuit cannot be located
precisely.
54 C.A 6681 Cable Locater
Fig.14