Relocating 100 amp residential panel

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timtom58

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Is it code compliant to use #3-3-3-5 cu from 100 amp disconnect.copper ser is very hard to find around here but home depot sells this on line .

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#3-3-3-5 Cu SER is good for 85A@60°C and 100A@75°C

If it is the main feeder for a dwelling and qualifies under 310.15(B)(7), it is good for 102A@60°C and 120A@75°C.

I provided the 60°C ampacities just in case you run it through thermal insulation or somehow manage to have only 60°C terminations.
 
Is it code compliant to use #3-3-3-5 cu from 100 amp disconnect,to new main panel location? 310-16 says #3 is good for 100 .copper ser is very hard to find around here but home depot sells this on line .

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Cust. Wants cu,instead .I normally use #2alu. It is getting relocated 14' over from present location,which is his bathroom.

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timtom58 said:
Cust. Wants cu,instead .I normally use #2alu. It is getting relocated 14' over from present location,which is his bathroom.

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Dennis Alwon said:
I hope you are not moving the panel into the bathroom.:?
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I think he was saying it's currently in the bathroom or what will be a bathroom and he's moving the panel 14' away.
 
Correct...moving from bathroom,14'away,i just never used awg #3 ,cust.wants cu.didnt want alu.#2 I was just wondering if anybody else has used number 3 copper

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Not to be obnoxious, but I think it's fair to say that when a customer starts objecting to the kind of wire I select, I think it's time to let the customer do it himself.
 
timtom58 said:
Correct...moving from bathroom,14'away,i just never used awg #3 ,cust.wants cu.didnt want alu.#2 I was just wondering if anybody else has used number 3 copper

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I use #3 all the time. Why would you think you couldn't for 100A? Well unless you're using some type of NM cable (or SE cable) and the code you're under requires you to use the 60 deg. column. Then it would be 85A. Don't know what's on the 100A panel but I highly doubt there is a 100A load, so you should be fine. You would have to put in a 90A breaker and the load couldn't be over 85A if the cable used uses the 60 deg column.
 
Little Bill said:
..You would have to put in a 90A breaker and the load couldn't be over 85A if the cable used uses the 60 deg column.
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310.15(B)(7)(1)&(2) allows an 83% demand factor for Dwelling services & feeders.
100A breaker is fine with #3cu @ 60°C, since we only count 83A or 83%.
 
Thanks for all the feedback guys .I almost agree with Ramsy, I should let this guy do it, but he's going to pay me,and help...cust is retired electrician from ford, js

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ramsy said:
310.15(B)(7)(1)&(2) allows an 83% demand factor for Dwelling services & feeders.
100A breaker is fine with #3cu @ 60°C, since we only count 83A or 83%.
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I was thinking OP said subpanel so I "assumed" it wasn't serving the entire load and therefore you couldn't use the allowance. You have to use the ampacity tables.
I went back and see that he said disconnect. My bad!
 
Little Bill said:
I was thinking OP said subpanel so I "assumed" it wasn't serving the entire load and therefore you couldn't use the allowance. You have to use the ampacity tables.
I went back and see that he said disconnect. My bad!
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Not a total 'bad'...

He did not say this SER feeder is a/the 'main feeder'. There could be a feeder tap or more than one service disconnecting means. Running through thermal insulation is also an issue. Prompted him for details. He appears quite reluctant as if wanting someone to say it is compliant when he knows the details do not support that conclusion. Either that or he simply chooses to ignore pertinent details.
 
newservice said:
Not to be obnoxious, but I think it's fair to say that when a customer starts objecting to the kind of wire I select, I think it's time to let the customer do it himself.
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I might feel this way if the customer is asking for something that is marginal from a code perspective and goes against my ethics, but why would you object to a more expensive installation that the customer is willing to pay for?
 
If a customer wants to pay more for copper. Why should you object. Copper doesnt require yearly preventive maintenance. Once its torqued thats it. If better quality is on the table and you prefer less quality and the customer ask for the best and you give home less thats not good i believe.

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