Engine : Electricity - 1378/1386
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| Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out? |
| A) De-energize the applicable switchboard bus. |
| B) Station a man at the circuit supply switch. |
| C) Bypass the interlocks. |
| D) Secure and tag the supply circuit breaker in the open position. |
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