In a triple phase system, metering across from neutral to ground, how many volts should there be?

In a triple phase system, metering across from neutral to ground, how many volts should there be?

• A. 0
• B. 120
• C. 60
• D. 240

Answer: (A)

Neutral and the equipment grounding conductor are bonded at a single point in the service equipment, so they sit at the same electrical potential. When you measure between neutral and ground, the voltage should be zero volts under normal conditions. A nonzero reading suggests a problem, such as a loose or high-resistance neutral, miswiring, or a fault causing current to travel through the ground path. The other voltages listed relate to line-to-neutral or line-to-line measurements in typical three-phase systems, not neutral-to-ground.

Neutral and the equipment grounding conductor are bonded at a single point in the service equipment, so they sit at the same electrical potential. When you measure between neutral and ground, the voltage should be zero volts under normal conditions. A nonzero reading suggests a problem, such as a loose or high-resistance neutral, miswiring, or a fault causing current to travel through the ground path. The other voltages listed relate to line-to-neutral or line-to-line measurements in typical three-phase systems, not neutral-to-ground.