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Electrical Wiring

Three phase open delta residential

9 years ago

A current thread made me wonder about the power delivery capacity of my three phase open delta 200A service vs, 120/240 single phase. More common three phase 200A can deliver 50% more power than single phase. This is purely an academic question, but can a 120/240 three phase service deliver 150% the power than a 120/240 single phase system? I know that it would be very difficult to max it out, but I wonder nevertheless.

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Comments (2)

Ron Natalie
9 years ago
What are the voltages on your phases?

If they are also 120/240, then the open delta should be providing the same power (watts).
ionized_gw
Original Author
9 years ago
Thanks, Ron. It is a high-, stinger-, red-, orange-, wild-leg (depending on my mood) delta transformer system so it is 208ish from that multi-named conductor to neutral. Between any two legs I have the predicted 240V and from the "tame" legs to neutral is 120V

The way I am looking at it. all three legs can provide the same max power provided the POCO's transformers are up to the task even though it is not, from their standpoint, usually designed for that.
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