Take the 2-minute tour ×
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's 100% free, no registration required.

I took a look inside my panel today and saw a big green wire connected to the neutral bus bar. Why are these two bonded together? Why not just send the neutral back where it came from? Where does the neutral line go once it leaves my house? Are the neutral and ground also bonded at the electric meter?

share|improve this question
    
See this: diy.stackexchange.com/questions/1706/… –  Cornelius Jul 12 at 20:32
    
I drew up some diagrams showing the connection of earth and neutral bars for another question. This shows where the neutral goes after it leaves your house. See here: electronics.stackexchange.com/a/121026/28570 –  Li-aung Yip Jul 13 at 16:45
add comment

1 Answer 1

up vote 3 down vote accepted

According to the North American electrical code (US and Canada), Neutral and Safety Ground must be bonded at the service entrance (or main breaker panel). The green wilre will also be connected to Earth via a ground rod driven into the earth near the service entrance. Neutral will also be grounded at the power pole and distribution transformer.

All this grounding ensures that the AC wiring is kept near earth potential, and won't drift up to 12 KV due to a fault in the distribution transformer.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.