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Steve G.
Steve G., Electrical Engineer
Category: Electrical
Satisfied Customers: 17986
Experience:  Spent 20 years as an Electrical Engineer, designing electrical plans and specifications.
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I am looking to purchase a 60kw generator.

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I am looking to purchase a 60kw generator.

Our panels are rated for 120/208. We have an Eaton panel. Will this generator be able to connect to our panel even though its rated at 120/240 ?

The generator will be fed through a 400amp transfer switch

Thompson Technology TS842 automatic transfer switch

The exact model of the ATS is TS842A0400B1AD1DNKAA

We are based in Canada.

Hello there and welcome to Just Answer. My name is XXXXX XXXXX I will be assisting you today. I am an engineer with over 30 years of electrical and electronic training, repair and installation experience. I will try and answer your question accurately and precisely so that we can get you on your way.

Now..if the electrical system in your building is 120/208V 3 phase, then you need an alternator that is 120/208V 3 phase.

The pdf you provided indicates that 120/208V 3 phase is an option - as it should be, it is the most common commercial building supply voltage in USA/Canada.

Is there a reason that you are not getting the 120/208V 3 phase option?

Please let me know so that we can continue.



Customer: replied 4 years ago.

There are limited available generators. We are not buying a brand new unit. The unit is used. Its equipped with 120/240v.


Just want to know if it will be more of a hassle trying to match it up to our 120/208.

How much of your building is going to be connected to this generator?
Customer: replied 4 years ago.

its for our datacenter. all the computer equipment. it will be connected to a certain panel that feeds another panel that goes to the equipment

Looking at the pdf you provided for the generator, look on page 2. There are three available alternators: 4P10, 4S7 and 4V7. Do you know which one you have and whether or not it is 120/240 single phase or 120/240 three phase (actually this is probably a high leg delta winding).

In either case I don't think this is going to work. The three phase unit only has 120V available on one leg, not three. Your building is wired completely differently.

You need a 120/208V three phase unit. Which brings me back to my original thought. Do you know which alternator you have?

Please let me know so that we can continue.

Customer: replied 4 years ago.

Its a 120/240volt I know this from the plate on the side of the generator. the seller sent me a picture of it.


its three phase 120/240


it also says 4s7 on the plate as well.

Customer: replied 4 years ago.

Hmmm justanswer is messed up it wont let me upload the image I have.



That's ok.

My advice is that this will not work.

To provide 240V 3 phase and 120V single phase, the alternator is wired in a 'high leg delta' arrangement. You can read more about that here: >>>CLICK<<<

This would work great IF your building was wired in a similar manner but it is not. It is wired for 120/208V 3 phase 4 wire.

The problem is connecting the generator output to the building system. It will not work.

You need a 120/208V 3 phase generator. Sorry.

I'll be here if you need further help with this issue. Please let me know.

Steve G. and 2 other Electrical Specialists are ready to help you

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