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by burfog
2668 days ago
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My local utility seems to offer it, though they prefer that you install a transformer. They also offer 3-phase for residential usage. Yes, this is in the USA. From what I can tell, most likely you'd get 480 volts at 500 amps. There is actually a home not far from me that gets 3-phase. It is hooked up to a commercial-style air conditioning unit (huge house) and has a separate power meter; the home has separate 2-phase service as well. |
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I'm sure there are some utilities somewhere that will offer you that :)
480 volt at 500 amps is actually fairly reasonable in terms of cable requirements (it only requires 800 kcmil cable, which, while, i'd never want to buy a ton of it, is not completely bonkers). I would be a little surprised if they offer 500 amps though, because that's a lot more than you'd ever need.
Remember that a 3 phase amp carries a lot more kilowatts than a single phase amp.
In particular, 20 amp 240 single phase = 4800watts But 20 amp 240 three phase is a factor of sqrt(3) more = 8313 watts
so 500 amp 480v 3 phase would carry 415692.19382 watts, while 500 amp 480v single phase (which nobody uses) would only carry 240000 watts.
So you'd be getting 415kw service out of that, not 240kw service. Which is a lot of power.
Usually i've seen them offer 250kw service (IE not in amps) and let you do the stepdown. This would step down to 300 amp 480v 3 phase.
240v 3 phase in residential areas is also more common (I can get it), but it's only 100-200 amp service at least here, and i pay for power factor, blah blah blah.