"Use the phone to identify wiring:"
When trying to identify unmarked wiring in a large or small wire pulls, wire two telephone hand sets according to the diagram below. Be sure the power to the wires being tested is off.
Put one lead from the first phone to ground and the other lead to one of the unmarked wires. Put one lead from the second phone to ground and then touch the second lead to each of the unmarked wires. When you touch the same wire your partner is on, you will be able to talk with him clearly and decide your next move and what marking is needed.
This idea has proven to be a time saver. It will allow you to test areas where visual contact is impaired by obstacles and grounding where continuity methods become slow, and in noisy surroundings which impair hearing with a radio set. It is known to work up to 500 feet and maybe even further.
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