steelersman
Senior Member
- Location
- Lake Ridge, VA
so you ran #2 AL or #4 CU?No, but I did run a properly sized 100 amp feeder to a sub panel. The inspector was wondering why the wire was so big.
Oh, we forgot to mention the disposal??
- Thread starter electricmanscott
- Start date
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steelersman
Senior Member
- Location
- Lake Ridge, VA
sorry for jumping the gun Peter.
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
I don't believe either of those would be allowed for a sub-panel.
#4 CU rated at 85-amps
#2 AL rated at 90-amps
per table 310.16 75c
tonyou812
Senior Member
- Location
- North New Jersey
that stinks. I should send you my kit reno questionare that I put every homeowner through before any reno or kit reno.
steelersman
Senior Member
- Location
- Lake Ridge, VA
I'm going off of 310.15 (B)(6)
Cow
Senior Member
- Location
- Eastern Oregon
- Occupation
- Electrician
You guys are both missing the boat.....
Do mean not allowed in reference to a 100 amp subpanel??
FYI, SER isn't 75 degree....
Do mean not allowed in reference to a 100 amp subpanel??
FYI, SER isn't 75 degree....
quogueelectric
Senior Member
- Location
- new york
#3 cu?????
steelersman
Senior Member
- Location
- Lake Ridge, VA
well if we're talking about SER then #4 CU would work
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
That is limited to "3-wire, single-phase service-entrance conductors, service-lateral conductors, and feeder conductors that serve as the main power feeder to each dweeling unit..... For application of this section, the main power feeder shall be the feeder between the main disconnect and the panbelboard that supplies, either by branch circuits or by feeders, or both, all the loads that are part or associated with the dweeling unit."
Since it is a sub-panel, it does not feed all the loads and cannot be used for the wire sizing.
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
- Location
- Windsor, CO NEC: 2017
- Occupation
- Hospital Master Electrician
Lou is right, 310.15(B)(6) cannot be applied to the sub-panel.
Scott pulled the minimum size cable for the application.
I'd have pulled a 14-3 anyway, Scott. People are fickle.
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
Now that the price of copper has dropped from over $4/pound to less than $1.50/pound, it's easier to pull the 14/3 (financially that is).
- Location
- Windsor, CO NEC: 2017
- Occupation
- Hospital Master Electrician
I suppose I should temper my statement with the fact that I haven't seen the house in the flesh, don't know how much wire would have been involved (really don't know the price difference in wire right now anyway), etc.
If it would have cost me an entire roll of 14/3 vs. 14/2, I wouldn't be so bold as to make that statement, I mean.
If it would have cost me an entire roll of 14/3 vs. 14/2, I wouldn't be so bold as to make that statement, I mean.
quogueelectric
Senior Member
- Location
- new york
Only on the service if it is larger than 100a you would have to use 3s. I will guess the service Scott put in was larger than 100. This is a subpanel.
Last edited:
- Location
- Windsor, CO NEC: 2017
- Occupation
- Hospital Master Electrician
No on two counts: If he used CU SER, then he would have had to use #1 CU SER, under the 2008 NEC.
If the feeder were between the service and a panelboard that served the entire dwelling unit, he would be able to use the table. It doesn't apply only to service conductors.
quogueelectric
Senior Member
- Location
- new york
I didnt know that Mass was on 2008 code maybe you know better. We will see...
- Location
- Windsor, CO NEC: 2017
- Occupation
- Hospital Master Electrician
As of 01/01/2008.
quogueelectric
Senior Member
- Location
- new york
Hey Scott did you use 1s CU??? Or 3s?? be honest Wait a minute here why SER for a subpanel why not just nmb?? I smell a rat!
- Location
- Windsor, CO NEC: 2017
- Occupation
- Hospital Master Electrician
From above:
Why wait around for NM when SER is readily available?quoqueelectric said:
quogueelectric
Senior Member
- Location
- new york
From above:
Why wait around for NM when SER is readily available?
Why use SER unless it is for a service?? As in Service Entrance Romex meaning you needed a main breaker at the drop and now you are feeding the main service panel with SER. Everything past that is nm we are talking about a subpanel off the main service. It should be nm not service entrance cable.
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