2020 NEC small service tips

[tommyv]

Somebody is asking about getting a service for a camera and security system in a remote area. Since the load is nominal and 1 or 2 branch circuits are all that is needed, this could go down to 20 or 30 amps. Apparently the existence of a power drop on the property may show intent for residential use to the tax assessor and cause a tax increase, so owner is asking to keep service at the minimum size to argue against.

It seems that 408.36 prohibits 2 space 3R panelboards (aka breaker enclosures) as service OCPD. Am I wrong? (If so, then I think non-fused disconnect immediately adjacent would meet the new single disconnect rule and 230.62.) Otherwise, I'm not aware of a main breaker panel smaller than 100 amps. A fused disconnect would comply, but who wants fuses? Alternatively, I think a 4 space 3R panel with two slots back-fed and the remaining two for load terminations would comply. I think terminal boots on the back-feed breaker (like Eaton TIMCB3/0) would be needed for 230.62(C).

Any further insights?

 

[retirede]

I’d first check with your utility. There is likely a minimum size service they’ll supply. And probably a lot larger than you’re envisioning!

Have you considered solar & batteries?

 

[tommyv]

Utility is a REC, basically willing to hang the meter loop on their pole on premises, don't care what happens downstream as long as it passes inspection. Solar would be okay but get-in cost is a lot higher and it's hard to predict the lifespan.

 

[electrofelon]

Yeah just get a small MLO 3R panel and back feed a breaker is your main, use whatever size you want.