Independent Electrical Contractors (IEC) Year 4 Practice Exam 2026 - Free Electrical Contractor Practice Questions and Study Guide

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In a 208/120 V, 3-phase, 4-wire system, what is the voltage between the neutral and the ground?

120

In a 208/120 V, 3-phase, 4-wire system, the neutral is the center point of the star-connected windings and is bonded to earth ground at the service equipment. Because neutral and ground are tied together at that single point, they sit at the same electrical potential during normal operation. So the voltage between neutral and ground is zero.

Remember: line-to-neutral voltage is 120 V, line-to-line is 208 V in this system, and 277 V would be the line-to-neutral voltage for a 480Y/277 V system, not this one.

208

277