Approve or Reject

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wnut4

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Electrican installed a 225 amp service for a house,also installed a 200 amp main breaker sub panel upstairs fed with 4/0 al SER cable from a 125 amp breaker located in 225a main panel,should this be allowed since sub has 200a main brk. or should sub have been MLO panel.
 
Re: Approve or Reject

Originally posted by wnut4:
Electrican installed a 225 amp service for a house,also installed a 200 amp main breaker sub panel upstairs fed with 4/0 al SER cable from a 125 amp breaker located in 225a main panel,should this be allowed since sub has 200a main brk. or should sub have been MLO panel.
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What difference does the breaker size in the subpanel make as long as the breaker feeding it protects the wires going to that subpanel?
 
Re: Approve or Reject

Costs more though,we buy at least 3,000 main breaker panel a year to buy a few MLO panels the cost goes over the edge.When we do a spit service we use what is on hand MBR panels no addition cost no additional ordering of a single MLO panel.
Any thoughts??? :D
 
Re: Approve or Reject

How did he land 4/0 on a 125 amp breaker? Did he have to cut some of the strands off?
 
Re: Approve or Reject

There is nothing wrong with this.I myself would have installed a 125 amp mlo panel and fed it with 125 amp wiring,but if you install as many panels as a.wayne's company does,they could buy the main breaker subpanels cheaper than I could buy a main lug panel of the same brand,that may be the case here.
 
Re: Approve or Reject

the question has been asked already!and not answered.HOW DO YOU TERMINATE 4/0s? the other answer are nice but most times it will not fit
 
Re: Approve or Reject

On another note we switched from homeline to GE panels unless speced otherwise I for one like them .we use #6 as a/c and heat unit feeds why? a 5 kw unit can have a max over 30 amps and we got burned all to many times on finals.32 amps # 10 is not allowed.homeline breakers have lugs rated at close to the ampacity rating so a 30 amp homeline breaker has to have the wire down sized with a joint in the panel but GE lugs are the same size 30 and up JMHO.
 
Re: Approve or Reject

just because its a 125 amp breaker doesnt mean the largest wire you can get in it is a #1 or 1/0

on the job i just came off of, the cutler hammer breakers in our MCCs might be 20 or 30 amps, but you could easily put a #1 in the terminals without clipping any strands

some manufactures actually consider that electricians might want to run something larger than the Minimum
 
Re: Approve or Reject

Originally posted by izak:
some manufactures actually consider that electricians might want to run something larger than the Minimum
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For long runs you are often forced to run larger sizes of wire than you might for shorter sizes anyway so I suspect CB terminals allow you to up size at least a couple wire sizes.
 
Re: Approve or Reject

I have never seen a 125 amp. breaker that could accommodate 4/0 AL in a residentially panel.Altering the circular mil size with a pair of dikes is the only way I see it fitting :eek:
 
Re: Approve or Reject

I dont know how he terminated it, but I have used a reducing crimp-on adapter many times for simular applications, especially where wire is upped for VD. They come in various sizes that will allow installation easily on 100a or larger breakers..........RP
 
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