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Remote Return Path
Electromagnetic fields radiate counter-clockwise in relation to the current flow. For example,
current flows out on a hot conductor and returns on the neutral. This change in opposite current
flow also creates opposing magnetic fields. So, when these two opposing conductors are close
together, the two magnetic fields tend to cancel each other out. This canceling effect diminishes
the circuit’s ability to radiate the transmitter’s strong signal making it more difficult for the
receiver to detect the signal.
Weak Signal Setup
Signals Cancel
Strong Signal Setup
No Signal Canceling
Strong Signal Setup
No Signal Canceling
Circuit
under
test
Separate Circuit
Water Pipe
To avoid the canceling effect of the opposing magnetic fields and optimize the transmitted
signal, the conductor to be traced should be separated from the return conductor by utilizing a
remote return path.
The simplest method is to use an extension cord to connect to a remote return path, such as a
neutral from another circuit. When identifying breakers, the hot and neutral are already separated
at the electrical panel so the use of the AC outlet adapter is sufficient.
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