Minimum size (amperage) service for a building.

[Crown Electrical]

I understand the smallest conductor needs to be #8, however I do not see minimum amperage requirement.

I usually put a minimum of of 60 amp..

Any thoughts on this?

Thanks.

 

[augie47]

Doers 230.79 not cover that ?

 

[Crown Electrical]

Yes. It would be a 60 amp.
Structure is not a 1 family dewelling and has more then circuits.

 

[ron]

If if has more than 2 circuits and not a dwelling, then you end up in 230.79(D). 60A minimum

 

[TheCrow]

3 small apt building .1 meter is feeding a 30 amp single main feeding a 30 amp breaker . 2 meter is feeding 2 pole 30 amp with two 20 amp breaker ,3 meter is feeding 1 30 amp breaker a 30 amp breaker . From the meter to the panel is 10 awg nm wire

 

[ron]

230.79 is the size of the service disconnecting means. Since it is a multifamily dwelling, the minimum size for the service disconnect is 60A.

Does the service terminate in a single service disconnect or 3 or 4 disconnects (3 for apartments and one for common)?

 

[LarryFine]

Also, check with your POCO. Dominion Energy's minimum selection on both residential and non-residential load letters is 100a.

 

[Crown Electrical]

230.79 is the size of the service disconnecting means. Since it is a multifamily dwelling, the minimum size for the service disconnect is 60A.

Does the service terminate in a single service disconnect or 3 or 4 disconnects (3 for apartments and one for common)?

Single service. This is for a small building 40 ft. by 20 ft.

 

[kwired]

Also, check with your POCO. Dominion Energy's minimum selection on both residential and non-residential load letters is 100a.

But what does that mean?

Here there are a couple POCO's that if you want underground supply, you must bury raceway, they will pull conductors.

Even if you want 100 amps they are pulling 4/0 aluminum, so you better have a 200 amp meter socket and then leave it with your 100 amp conductor.