2017 nec

[domnic]

2017 nec. can I use #4 copper for a 100 amp single family service.and 4/0 copper for a 200 amp service. what article please?

 

[domnic]

2017 nec

2017 nec. can I use #4 copper for a 100 amp single family service.and 4/0 copper for a 200 amp service. what article please?

2/0 for 200 service'

 

[texie]

See 310.15(B)(7).

 

[Dennis Alwon]

Use the 83% method. 100 amps x .83= 83 amps, therefore you only need a conductor good for 83 amps. 200 amps = 166 amps

 

[kwired]

Same section as it has always been, but the old table has been removed and the 83% method is what is used now.

If no adjustment factors are necessary (which the old table did not address) then you still end up with same conductor size as you would have using the old table.

BTW the table went away with the 2014 NEC.

 

[tom baker]

But those clever folks at the NFPA put the table in Annex D so its not really gone.

 

[kwired]

But those clever folks at the NFPA put the table in Annex D so its not really gone.

Didn't know that, but why?