Sub Panel Feeders

[triplex15]

I had an inspector say 2/0 AL isn't rated for 100amp sub panel but article 310-16 states otherwise. Is there an article that specifies wire sizing for sub panels? Any help would be appreciated. Thank You.

 

[Dennis Alwon]

I had an inspector say 2/0 AL isn't rated for 100amp sub panel but article 310-16 states otherwise. Is there an article that specifies wire sizing for sub panels? Any help would be appreciated. Thank You.

2/0 alum cannot be used at the 90 c except for derating. If you are using sec and you are in the 2008 NEC then you must use the 60C column otherwise 75 C column is applicable

 

[triplex15]

I am using SER and the 75 degree column still states its good for 135 amps.

 

[Dennis Alwon]

I am using SER and the 75 degree column still states its good for 135 amps.

Again you cannot use ser at 75C but rather at 60C. If the feeder is connected to a 100 amp breaker then I see no issue- you are correct

 

[Dennis Alwon]

I would politely ask the inspector why he thinks it is a violation. Perhaps he thinks the wire is #2 rather than 2/0

 

[raider1]

2/0 Aluminum is good for 115 amps on the 60 degree colum and 135 amps on the 75 degree column of 310.16.

If in fact you are asking about #2 SER then you can't use Table 310.15(B)(6) for a feeder from a panel to another panel. Tabel 310.15(B)(6) can only be used for the main power feeder.

Chris

 

[triplex15]

I thought he might of missed the wire size as well but I will ask him again. I appreciate everyone's quick response and help.

 

[Dennis Alwon]

You're welcome...

 

[romeo]

Sub Panel Feeders

I had an inspector say 2/0 AL isn't rated for 100amp sub panel but article 310-16 states otherwise. Is there an article that specifies wire sizing for sub panels? Any help would be appreciated. Thank You.

I wonder why you didn't use 1/0?