Code Question Found in 2008 NEC Book
1. The secondary circuits of current and potential instrument transformers must be grounded where the primary windings are connected to circuits of ____ or more to ground and, where on switchboards, must be grounded irrespective of voltage.
a) 300V
b) 600V
c) 1,000V
d) 150V
Code Reference?
Email answers to cmcgowan@mt.net