
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 4 of 4
The 350 System cannot be used to survey a fibre-optic cable unless the cable can carry
an electrical tone through a conductive core or through its insulated armoured cover-
ing.
C.1.2.4 General Connection Requirements
❐ Always use good grounding connections throughout the installation to avoid intro-
ducing mains related frequencies onto the cable.
❐ You must separate the return path from the outgoing tone current. Do not use a
separate conductor in the same cable to provide a return path.
❐ Do not allow the tone current to exceed the maximum rating for cable circuits that
have repeaters.
C.1.3 Seawater Return Path
If the far end of the cable is in the water, then the sea water itself can provide the sig-
nal return path. To use this method, you should attach a sacrificial anode to the
exposed cable core and seal the cable against water ingress at the far end.
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