Question: Separately derived systems supplied by transformers with a primary voltage rating less than 1 , 0 0 0 volts are not required to be grounded

Separately derived systems supplied by transformers with a primary voltage rating less than 1,000 volts are not required to be grounded if which of the following conditions are met?
a. Continuity of control power is required.
b. The conditions of maintenance and supervisio ensure that only qualified persons service the installation.
c. The system is used exclusively for control circuits.
d. All of the above.
Separately derived systems supplied by

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