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Suppose I have a duplex, building A, which has 2 electric services. It also has a detached garage structure, building B. Each tenant has half the garage. Weirdly, garage lights are powered from the house of a cooperative neighbor so are on neither service. That is the only service to the building and it cannot possibly carry EV loads.

Now, with EVs arriving, each tenant wants an EV charge station, and they understandably want it powered off their own meter.

How do we make that work legally per NEC? It seems like we will have 3 services to the building. Will we be forced into a new service there and doing "pay stations"?

Can the alien services come into the building if they only serve a hard-wired EV station?

Will it help if the EV stations are standalone stands just outside the garage? (It doesn't have doors anyway).

Harper - Reinstate Monica
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I would call this OK but it depends on your AHJ's interpretation of "different uses"

NEC 225.30(E) permits a structure to be fed by multiple branch circuits or feeders that have "different uses":

(E) Different Characteristics

Additional feeders or branch circuits shall be permitted for different voltages, frequencies, or phases, or for different uses such as control of outside lighting from multiple locations.

I would call two separately metered tenants in the garage "different uses" myself. However, I am not sure what AHJs think of such a setup, as power to garages has not needed to be split among tenants like this until now.

Note that you'll need a local disconnecting means for each branch or feeder to the garage to comply with 225.31, as well as a grounding electrode system at the garage tied to the equipment grounding conductors of all the branch & feeder circuits at their respective disconnects. (The good news is that since EV chargers don't use neutral, you can use bog-standard non-fusible air conditioner pullouts for the EV charging circuit disconnects.)

ThreePhaseEel
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