Question

A panelboard containing a 4-wire, delta-connected system shall be permanently field marked to identify the voltage to ground on the high leg. True or False?

Answer 1

False. A panelboard containing a 4-wire, delta-connected system should be permanently field marked to identify the high leg or wild leg, which is the ungrounded phase conductor with a voltage higher than the other two phase conductors.

Step-by-step explanation:

False. A panelboard containing a 4-wire, delta-connected system should be permanently field marked to identify the high leg or wild leg, which is the ungrounded phase conductor with a voltage higher than the other two phase conductors. In a delta-connected system, the high leg has a voltage to ground that is equal to the line voltage multiplied by the square root of 3.