Question

Panelboards supplied by a three-phase, 4-wire, delta-connected system shall have the phase with the higher voltage-to-ground (high-leg) connected to the _____ phase.

a. any of these
b. B
c. A
d. C

Answer 1

In a three-phase, 4-wire, delta-connected system, the phase with the higher voltage-to-ground (high-leg) must be connected to the B phase, following industry standards for safety and consistency.

Step-by-step explanation:

The student's question relates to the proper connection of a panelboard in a three-phase, 4-wire, delta-connected electrical system. Specifically, the question asks which phase should be connected to the phase with the higher voltage-to-ground, known as the high-leg. The correct answer is that the high-leg should be connected to the B phase. This is a convention used in the electrical industry to ensure consistency and safety across installations. This convention helps prevent improper connections that can lead to equipment damage or safety hazards due to the higher voltage present on the high-leg.