The secondary of a transformer delivers 12 volts. One of these secondary conductors must be grounded when the supply voltage to the transformer is from a ___. I. 2-pole breaker in a 120/208-volt, 3Ø, 4-wire panelboardII. 1-pole breaker in a 277/480-volt, 3Ø, 4-wire panelboard
Select one:
a.I only
b.II only
I or II
d.neither I nor II
