Jump to content

Main Bonding Jumper?


dtontarski
 Share

Recommended Posts

I inspected a 90's manufactured home this morning. The service panel has separate terminal bars that both appear to be isolated from the service panel and no apparent main bonding jumper. Each terminal bar appears to have grounding electrode conductors that go to grounding electrodes (could not verify due to heavy snow cover). The neutral terminal bar is bonded to the home's copper water lines, but not to earth through the plumbing, as plastic runs from the home to the pump. As I understand it, this service panel requires a main bonding jumper between the terminal bars and the panel enclosure should also be bonded. I've enclosed a photo. Am I missing something? Both GEC's and the bond to plumbing supply pass through the enclosure together in a threaded clamp - would this be sufficient to properly bond these components? I'm recommending further evaluation and corrections by a qualified professional due to the double taps and excessive sheathing in the panel. Please advise on the bonding issues and any other issues you observe in this photo. Thanks!

Download Attachment: icon_photo.gif Copy of Gardner 032.jpg

134.13 KB

Link to comment
Share on other sites

You should look for a label on the panel that says, "Suitable For Use Only As Service Equipment"

Those panels have no separate jumper. (Yours doesn't look like one of those, but you should check.)

ALSO: Don't I see a greenid="green"> bonding screw on the left terminal, just above the lower ground?

Originally posted by dtontarski

I inspected a 90's manufactured home this morning. The service panel has separate terminal bars that both appear to be isolated from the service panel and no apparent main bonding jumper. Each terminal bar appears to have grounding electrode conductors that go to grounding electrodes (could not verify due to heavy snow cover). The neutral terminal bar is bonded to the home's copper water lines, but not to earth through the plumbing, as plastic runs from the home to the pump. As I understand it, this service panel requires a main bonding jumper between the terminal bars and the panel enclosure should also be bonded. I've enclosed a photo. Am I missing something? Both GEC's and the bond to plumbing supply pass through the enclosure together in a threaded clamp - would this be sufficient to properly bond these components? I'm recommending further evaluation and corrections by a qualified professional due to the double taps and excessive sheathing in the panel. Please advise on the bonding issues and any other issues you observe in this photo. Thanks!

Download Attachment: icon_photo.gif Copy of Gardner 032.jpg

134.13 KB

Link to comment
Share on other sites

From what I can see in the picture that panel is correct. It is a sub panel because it is in a manufactured home. The main panel with a main disconnect should be outside at the meter. The grounding buss bar should be bonding to the panel box. from the picture I can't tell if it is.

Link to comment
Share on other sites

Thanks for the review. The green screw is probably the panel enclosure bond. I typically see a main disconnect on the exterior with manufactured homes and a sub-panel with isolated neutrals and grounds. This home did not have a remote main disconnect. There could be a bonding strap under the plastic, but I couldn't verify this. As long as I'm recommending further analysis, I'm going to recommend that the main bonding jumper be verified. I'm used to seeing exposed bonding wires or metal bars between the terminal bars. As the main bonding jumper at the service panel is so critical, I'd rather be safe than sorry on this one.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...