Engine : Electricity - 1334/1386
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| Before work may safely commence on a high voltage system, what must first be done after disconnection and isolation? |
| A) The circuit must be grounded first, then tested and proved dead with an off-line tester. |
| B) The circuit must be grounded first, then tested and proved dead with a live-line tester. |
| C) The circuit must be tested and proved dead first with a live-line tester, then grounded. |
| D) The circuit must be tested and proved dead first with an off-line tester, then grounded. |
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