Generators that can supply high leg delta 120/240V?

[BTC]

I have a client who has 120/240V 3 phase 4 wire, with high leg on C phase. Is it possible to procure a 120/240V 3 phase 4 wire generator than can supply high leg, or are generators usually just 240V 3 phase?

 

[Todd0x1]

I think you'll end up with a wye generator supplying a transformer.

 

[electrofelon]

120/240 three phase generators are not uncommon and readily available, however A quick and dirty search shows a few more choices and smaller sizes available in 120/208.

 

[dkidd]

12 lead generators can be wired for high-leg.

https://www.marathongenerators.com/generators/docs/manuals/Connection%20Diagrams.pdf

Sizing is not real straight forward.

 

[zbang]

Depends a bit on the size, less likely to find a 10kw unit than a 50kw. (I've had rental 50-100kw gensets that would do it.)

 

[Cow]

To answer your question, yes.

We installed a Generac years ago with that arrangement. My folks have an older military surplus gen backing up their dairy that is a high leg too.

 

[hillbilly1]

As dkidd stated, they can be configured for it. I had a used Kohler that I installed on a building, it came 277/480, Changed it to 120/240 delta to match the building power. Be wary of Genercraps, as a lot of them cannot be converted.

 

[Todd0x1]

Ah I stand corrected. I was thinking of my rental units which are switchable 277/480 | 120/208 | 120/240-1ph. I hadn't considered alternate wiring arrangements for the 12 lead alternator itself.

 

[ptonsparky]

I missed a project because I wanted too much money for a unit that provided a hi leg as did the POCO. Generac was way cheaper with standard 208. Inspector didn’t care either.

 

[Little Bill]

My question is why would you need a high leg? Or is it just that you need 240V 3Ø?

 

[ptonsparky]

My question is why would you need a high leg? Or is it just that you need 240V 3Ø?

To match what is there?

 

[Little Bill]

To match what is there?

I was thinking why the high leg as it has no use other than being the 3rd leg of a 3Ø.

 

[goldstar]

I have a client who has 120/240V 3 phase 4 wire, with high leg on C phase. Is it possible to procure a 120/240V 3 phase 4 wire generator than can supply high leg, or are generators usually just 240V 3 phase?

Yes. I installed a 55KW Generac unit at a day camp intended just to run the pool motors (4 motors total + chlorine pumps - 2 swimming pools)). If there is a power outage and the pumps aren't running the PH factor in the pools goes down in about 20-30 minutes in the summer heat.