Electrical Safety: Understanding Neutral Wire Voltage in Power Systems

What potential voltage does the neutral wire have in a 120/240 volt, 3 phase, 4 wire delta system?

a) 120 volts

b) 240 volts

c) 0 volts

Answer:

c) 0 volts

In a 120/240 volt, 3 phase, 4 wire delta system, the neutral wire has 0 volts potential to the ground. This is because the neutral wire provides a return path for the current and is grounded at the distribution panel.

Explanation:
In a 120/240 volt, 3 phase, 4 wire delta power system, the neutral wire has 0 volts potential to the ground. The neutral wire serves as a pathway for the current to return when there is an imbalance among the phases. It is directly connected to the ground at the distribution panel, making its voltage level the same as the ground, which is 0 volts. This knowledge is essential for electrical safety and the proper operation of electrical and electronic devices.