See Figure - Wavetek Meterman ECB50 Mode D'emploi

Keep hands clear of wiring when tracing wires or fuses in
distribution panels.
Locating and Tracing Cables in Walls
1. Turn on the receiver using the On/Off switch.
2. Set the Fuse/Line switch to the Line position.
3. Plug the ECB transmitter into the socket for AC line to be traced.
4. Turn the On/Off switch toward the top of the receiver to set sensitivity
to the highest sensitivity level. Turn toward the bottom of the receiver
to reduce sensitivity.
5. Place the ECB50 receiver close to the transmitter to receive a
confirmation signal that both ECB50 test components are active and
working. The receiver is receiving a signal from the transmitter when
it displays the letter "H" on the display and the LED is blinking. Also
an audible signal is present with varied loudness depending on
strength of signal received.
6. Next, begin locating the signal in the cable to be traced by circling
around the socket. When you receive a signal, reduce the sensitivity
until the minimum signal is received. If the signal decreases, the
receiver is either moving off the AC cable path or the cable is installed
deeper into the wall. If necessary, adjust the sensitivity level to
increase the signal strength. Depending on local conditions, the
tracing depth amounts to approx. 0 to 40 cm (0 to 15 inches).
Sorting Out a Single Wire in a Bundle
of Cables
1. Turn on the receiver using the On/Off switch.
2. Set the Fuse/Line switch to the Line position.
3. Plug the ECB transmitter into the socket of the AC wire to be traced.
4. Turn the On/Off switch toward the top of the receiver to set sensitivity
to the highest sensitivity level. Turn toward the bottom of the receiver
to reduce sensitivity.
5. Place the ECB50 receiver close to the transmitter to receive a
confirmation signal that both ECB50 test components are active and
working. The receiver is receiving a signal from the transmitter when
it displays the letter "H" on the display and the LED is blinking. Also
an audible signal is present with varied loudness depending on
strength of signal received.
6. Next, try to locate the transmitted signal at the bundle of cables.
When you receive a signal, reduce the sensitivity until the minimum
reception of the signal is heard and seen. If necessary, increase the
sensitivity somewhat to confirm the signal.
W
Caution
5

See Figure

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See Figure -3-