4 AWG copper feeders for 100 amp sub/distribution panel

jfrederick · January 10, 2013, 12:07pm

Yea or nay?

Thanks in advance.

jfrederick · January 10, 2013, 12:14pm

Pics…

Jim_Port · January 10, 2013, 1:05pm

What is the calculated load on the subpanel? What size breakers protected those feeders?

jfrederick · January 10, 2013, 1:07pm

Not a clue

100 amp

jfrederick · January 10, 2013, 2:28pm

Jello?

Jim_Port · January 10, 2013, 2:40pm

If that feeder serves the entire load of the dwelling, the #4 CU is good for 100 amps. If it only serves a portion of the load it is good for 85 amps. A 90 amp breaker would be the next size up available.

jfrederick · January 10, 2013, 2:44pm

Yes, the load for this unit is what you see in the picture.

Jim_Port · January 10, 2013, 3:36pm

So there is a disconnect ahead of this panel? If so why are the neutrals and grounds on the same bus? Is the 4th conductor on the top right of the bar?

The LV transformer should not be there. Not a fan of the tags either.

jwhitt · January 10, 2013, 3:42pm

If there is nothing else in the panel that houses the 100 amp breaker for this panel then the #4 is alright. There needs to be separation of the grounding and grounded conductors in this panel and it need to be supplied with four wires which is a violation as well as the small transformer in the bottom left.