310.15(b) 7

[difowler1]

Does that mean, if you have a 320amp meterbase, you could use wire rated for 83% of that load?

Or does it mean, if your calculated load for the house is 270 amps, you could use wire rated for 83% of that load?

 

[difowler1]

310.15 (b) 7

310.15 (b) 7

single phase dwelling services and feeders. 2017 code book

 

[difowler1]

310.15(b) 7 (1)

310.15(b) 7 (1)

is the one i am looking at.

 

[Carultch]

Does that mean, if you have a 320amp meterbase, you could use wire rated for 83% of that load?

Or does it mean, if your calculated load for the house is 270 amps, you could use wire rated for 83% of that load?

83% applies to the rating of the service, which means you'll have to round up to the actual service rating & service OCPD rating you will be using.

If your calculated load is 270A, the smallest service you could have a 300A service rating. Therefore you'd use 83% of 300A to size the service conductors.