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The electrical code states which conductors can be used for underground installations. When underground installations are in progress, the back filling requires a safety tape to be installed. It is a yellow tape with the words "CAUTION buried electrical cables" printed on it. The tape is placed 12 inches below the finished grade and directly above the underground wiring. This positioning is so that if any machinery digging in the future hooks the tape, the work will stop immediately and hand digging will commence to find the cable before machine digging restarts. It is much cheaper to find the cable than to repair the cable.

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