ECN Forum Forums Code Related Discussion NEC & other Code issues Re: Tap?

Shortcircuit:
Yes, modifications to buss cause issues with the listing. Alas, it has been 'common practice' for some time.

Dependent on having a PE/EE provide methods and materials, and a signed sealed drawing, it is acceptable in most cases.

A few jobs required the mfg to provide the materials and make the mods, and provide UL field certification. That is when $$$ is no object, as it it very costly

Harold, how did this job work out?

I went back yesterday. I had a new set of drawings that showed the correct way it was all actually installed. There were some 800 amp quick blow fuses before the tap for the PV system. So the feeder to the PV was protected. They also didn't tap the bus, but bugged the incoming wires. II have signed and certified drawings from an EE for this job.

Thanks for the follow up Harold.

The EE still has to follow the 120% rule.

How did this work out Harold?

Short circuit,


The EE did indeed follow the 120% rule and he marked it out on the new set of plans that he drew up.