In Conductive Mode, where should the ground plate not be placed?

• A. Over another pipeline
• B. Next to the transmitter
• C. In damp soil
• D. On a non-conductive surface

Answer: (A)

In Conductive Mode, the ground plate provides the return path for the injected current into the earth so the signal can be detected near the target line. Placing the ground plate over another buried pipeline would create an alternate current path into that pipeline, energizing it and distorting the locating signal. This not only ruins accuracy but can pose a safety hazard by energizing another utility. Therefore, the plate should never be placed on or directly above another buried pipeline.

You can place the plate in a groundable area near the transmitter to form a solid current loop, and damp soil helps improve conductivity for a stronger, clearer signal. A surface that is non-conductive is not ideal because it reduces direct contact with the earth, though the main safety concern remains avoiding placing it over another pipeline.