Commercial taps of Feeder in a MSB switchboard

[gisdude]

Hi guys,
For some commercial customers installing a bus tap instead of potentially removing some sections and installing new sections would be a cost saver. However, the bus that is at the main that is being touched/drilled/re-lugged might not be NEC/UL compliant after the pull section integrity has been "compromised". Any feelings on this? It's starting to come up a lot and we're discussing if this might be against the AHJ.

Thx

 

[resqcapt19]

You have 3 choices. 1) get written approval from the manufacturer for the changes, 2) have a custom panel shop that can provide a new listing label make the changes, or 3) make the tap on the conductors that feed the existing switchgear. The last option would likely require the installation of some type of "tap" box on the line side of of the existing equipment, and if the supply is made up of parallel conductors you have to make connections to all of them.