When connecting three transformers for three-phase use with a delta secondary, a voltage test should be done before closing the secondary. The correct voltage reading is _____.

A) the rated secondary voltage value
B) twice the rated secondary voltage value
C) zero volts
D) the sum of the three transformer primaries

Secondary Voltage

The output voltage of a transformer or another device that reduces or increases voltage from the primary voltage supplied to it.

Delta Secondary

A configuration for the secondary winding of a transformer where the ends of the coils are connected to form a triangle-like circuit, allowing it to supply both three-phase and single-phase load currents.