After running the Optional Calculation for One Family Dwelling,,, I come up with a diversified, bottom line number of 47,720 volt-amps ,, at 240V that divides out to 198.83 amp service. Does that mean that a 200 amp service would satisfy this residence? I realize future growth might affect your answer, but even if you were satisfied to disregard future growth does that 200 amp service allow for the 198.83 of load. Maybe what I am asking is what exactly does that 198.83 amps represent? I know its not the same but if we had a 20 amp motor, we would not put it on a 20 amp breaker. thanks !
New Residential Service Sizing when the computation is very close to service size.
- Thread starter smclott
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texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
Assuming your calc methods and math are correct, the 198.83 (199 amp per 220.5(B)) represents the required feeder or service size and a 200 amp service would be appropriate per Art. 220. Of course, as you mentioned, that does not allow for possible future needs.
ceb58
Senior Member
- Location
- Raeford, NC
Agree with texie. If this is something you are bidding then you have to go with it. If its something you will not have any competition on then price it both ways and let the customer decide.
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