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Oversized panels supplied by existing service entry conductors #87928 05/04/04 03:15 PM
Joined: Mar 2001
Posts: 345
T
tdhorne Offline OP
Member
I've been running into a lot of panel change outs that were done years ago in order to provide for more branch circuits with no increase in the size of the service entry conductors. One I surveyed this morning was a two hundred ampere split buss panel that was connected to a sixty ampere service entry cable. The customer is asking that the existing panel be updated to breakers. I had to give him the bad news that he was looking at a heavy up rather than a simple change out.

My question is how much of this sort of thing do others see.
--
Tom H


Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
2017 / 2014 NEC & Related Books and Study Guides
Re: Oversized panels supplied by existing service entry conductors #87929 05/04/04 04:36 PM
Joined: Apr 2001
Posts: 449
F
Fred Offline
Member
I see a lot of this. 100A panels with the original 60A meter socket and #6 cloth covered SE cable risor. Most I have seen were done in the last few years by a cheap HO that was told by a realtor they had to upgrade to sell the house and the "home inspector" didn't catch it. On the other hand, I saw one this week where a lady had just purchased this house last month and had her own "home inspector out last week to check everything out. She called me because he had noted that the service conductors were the wrong size and she was afraid she had a potential fire on her hands. The panel was an ITE 150A 30 circuit Main breaker circa 1970 and in good shape. The "wrong sized" conductors were 4/0 copper. The inspector's report stated that the service entrance conductors for a 150A service should not be larger than #1 copper or 2/0 aluminum. I had a hard time convincing her it was okay to go bigger. The old ITE panel had lugs that were marked to accept 250.

Re: Oversized panels supplied by existing service entry conductors #87930 05/04/04 09:54 PM
Joined: Apr 2004
Posts: 29
D
djpep55 Offline
Member
If the homeowner doesn't have me fix these I report it to the POCO and local building department. It's not that I'm upset about not getting the job, but rather upset about the potential for loss of life. I don't care if I fix it or someone else does, as long as it's fixed. There are typically other violations as well...such as grounding.

Re: Oversized panels supplied by existing service entry conductors #87931 05/05/04 10:12 PM
Joined: Jun 2003
Posts: 681
P
PCBelarge Offline
Member
The service entrance conductors have to be sized according to 230.42... the load calculated.
But... 230.90(A) Says the overcurrent protection of the service conductors cannot exceed the allowable ampacity of the service conductors.

Pierre


Pierre Belarge

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