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Steve G.
Steve G., Electrical Engineer
Category: Electrical
Satisfied Customers: 17150
Experience:  27 years in Electrical Engineering, designing electrical plans and specifications.
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How do I wire two disconnects on a 30 kva transformer with

Resolved Question:

How do I wire two disconnects on a 30 kva transformer with an under ground feed
Submitted: 1 year ago.
Category: Electrical
Expert:  Steve G. replied 1 year ago.
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..are you looking for me to size the breakers and wiring?

What are the primary and secondary voltages of the transformers?

Please let me know so that we can continue.

Regards
Steve
Customer: replied 1 year ago.

480 volts primary 240 secondary I pulled 2/0 to transformer location underground I need to wire two disconnects one for each side how do I go about doing that

Customer: replied 1 year ago.

And what size sealtight I'll need for both sides from disconnects to transformer

Expert:  Steve G. replied 1 year ago.
And I assume that this is three phase?

If so, you will need a 50A fused disconnect/breaker on the primary side.

On the secondary, you will need a 100A fused disconnect/breaker and assuming that your secondary run is not excessive, you can use #2 conductors and a #10 ground.

If the secondary is delta, then you will not have a neutral. If it is wye then you will.

Is that the information you were looking for?

Please let me know so that we can continue if necessary.

Regards
Steve
Steve G., Electrical Engineer
Category: Electrical
Satisfied Customers: 17150
Experience: 27 years in Electrical Engineering, designing electrical plans and specifications.
Steve G. and other Electrical Specialists are ready to help you
Customer: replied 1 year ago.

Yes ! How do I route my primary wires since it's underground do I use the transformer as a race way

Expert:  Steve G. replied 1 year ago.
The transformer is underground?

You can direct bury your wiring (so long as your local codes allow it) or you can run it in pipe.

Primary would be a 1" conduit, secondary would be 1.5".

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

Regards
Steve

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Steve G.
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27 years in Electrical Engineering, designing electrical plans and specifications.