A Practical Guide For Underground Services Location and CCTV Drainage Surveys

Electric Cables

The tracing of underground electrical services can be split into 3 types - LV,HV and domestic.

LV Electric ( upto 11,000 volts)
If the cable is live we can trace the electrical field around the cable. If not live ,and the cable is exposed in an inspection chamber/lighting column etc., we induce a signal down the cable using a clamp and trace this unique signal with an RD4000.

HV Electric (over 11,000 volts)
This a particular difficult service to find as it is “balanced” and does not normally have a field that can be traced. It is therefore imperative that access to the cable is available via an inspection cover in order that a signal can be induced in the cable by a non invasive clamp.

Domestic (410 volts)
Traced in a similar manner to LV electric.

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