Intercepting Busbars in Switchboard

[aaSpencer]

Hello all,
A generator and ats were installed to serve an existing switchboard, however, the design was to cut into the busbar of
the switchboard (after the CT section). has anyone done this?
Thanks

 

[69gp]

Hello all,
A generator and ats were installed to serve an existing switchboard, however, the design was to cut into the busbar of
the switchboard (after the CT section). has anyone done this?
Thanks

From reading your post it sounds as if the work has already been done. From my experience you may be voiding the UL rating of the switch gear if do not do it per the manufacturer. There are companies that will pre bend and fabricate all the buss bar. They will install and or modify the board as needed. When completed they have the capability to UL certify the equipment.

 

[chris kennedy]

has anyone done this?

Yes but after sending the manufacture an RFI with a detail of where we proposed to tap the bus and getting E-mail approval.

 

[donaldelectrician]

Bus Bars and Switch Gear is Modified all the time .


just work with the Manufacturer .



Don

 

[electrofelon]

Hello all,
A generator and ats were installed to serve an existing switchboard, however, the design was to cut into the busbar of
the switchboard (after the CT section). has anyone done this?
Thanks

An inspector can always call out a 110.3(B), but in general I think its "pretty safe" to bolt on listed lugs to existing holes and/or at splice plates. Are you talking lugs and wire conductors, or busbars? I think busbars are a bit more sticky as I cant see a way to do that per the NEC.

Yes but after sending the manufacture an RFI with a detail of where we proposed to tap the bus and getting E-mail approval.

And you really get a, "sure go ahead we'll approve it" on that? I admit I have never tried that, but I have a hard time believing it would go that way, especially getting something in writing. I bet they would send their field engineering crew out to the site (for big $$) and inspect or want to do the work themselves. Square D wanted 20k to come out and replace and obsolete breaker (it involved some bussing modifications).