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When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum...

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When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of 3000Vdc which procedures should be followed to establish an electrically safe condition?

A.

Determine possible sources electrical supply an avoid exposure to energized conductors or parts.

B.

Apply lockout/tagout devices and install a listed isolation transformer.

C.

Mount inverters on nonconductive supports and temporarily ground one dc circuit conductor.

D.

Verify that disconnecting device blades are closed and test conductors using an adequately rated detector.

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