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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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