Extra N-G Bonds

[Seven-Delta-FortyOne]

I’ve looked at two jobs in the last two days, where interior sub panels had N-G bonds.

One is a 200A main, stubs through the wall with SE cable to a sub panel in the garage. Sub is bonded as well.

Second is more complicated. 200A main on house, underground (I assume) 3-wire cable to ATS in attached garage, probably 60 feet away.

Bonded again in ATS. Then from ATS through gutter to 2 meter main combos (private meters), 1 feeds house, one feeds ADU, both have N-G bond.

My only job on this one is to replace the ATS, but as there is no 4-wire cable, I can’t do much about it.

It just made me a little curious, was this a common habit at some point, to have multiple N-G bonds?

 

[LarryFine]

It just made me a little curious, was this a common habit at some point, to have multiple N-G bonds?

A common error, perhaps, as well as a result of stinginess and/or laziness.

 

[letgomywago]

I take the buss bridge between some panels off and use one side for one and the other with the green. If someone saw it and didn't know I took out the jumper buss then they'd assume it's joined. I could see someone also thinking that they can just install it that way if they didn't know they were joined by the buss.

 

[augie47]

I was fairly common in this area up until the 70s or 80s.
You might note, it was allowable under certain conditions, when feeding a detached structure and is still referenced in 250.32(B) Exception

 

[electrofelon]

Might be a regional thing where it was more common, I have hardly ever seen it. The few times I have it was where a service rated ATS was added and the N's and G's were not separated (which I can understand the desire to skip that , what a miserable tedious task esp in a messy packed panel). The one I see more often is EGC's landed on the neutral bar. Usually it's a panel with metal raceways and no wire EGC's, then someone comes along and added some MC and cant figure out what to do with the green wire

 

[Seven-Delta-FortyOne]

SE Rated ATSs are a royal pain in the donkey. Don’t even get me started.

Apparently the POCO is breaking my rocks about one I did a few weeks ago.

Just found out about it last night.