Return to the Electrical Wiring Forum | Post a Follow-Up

Bonding ground wire in main service panel

Posted by flyhop (My Page) on
Sun, Jun 30, 13 at 8:36

Shouldn't there be a grounding wire leading from a metal contact of the main breaker box itself (the big grey box that houses the service coming in and all of the smaller breakers) to the neutral/ground buss bar?

When I use a simple light tester and connect one probe the hot terminal of a 15 or 20A breaker and connect the other probe to the neutral/ground buss bar, it lights up. When I move that 2nd probe from the buss bar to the metal box itself, nothing. Shouldn't the box itself be bonded to the buss bars in some fashion? If it were bonded, wouldn't my tester light up?

Thanks in advance.

Follow-Up Postings:

RE: Bonding ground wire in main service panel

Why don't you keep it all in the same therad?
There doesn't necessarily need to be a bonding wire. The panels are almost always constructed so that the grounding terminals are electrically connected to the case (though sometimes there may be a provision for removing that bonding, typically a screw or bar).

What did you use to make the connection to the case? The paint and even to some extent the rust will be a reasonable insulator. You need to find some place where you've got bare metal (I typically use the inside of one of the screw holes that previously had the cover screw in it).

RE: Bonding ground wire in main service panel

I posted again as I wasn't sure I was asking the right question. Seemed easier to just start over.

I got your post on other. You were right about finding bare metal on box to test on.'s bonded to one of the bussbars.

Thanks again.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here