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ProGrade
ProGrade, Certified Electrical Contractor
Category: Electrical
Satisfied Customers: 514
Experience:  28+ years exp. - installation, troubleshooting, & repair of commercial, & residential electrical systems.
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I need 120/240 volts secondary. I have 480 volts 3 wire

Customer Question

I need 120/240 volts secondary. I have 480 volts 3 wire available for primary. Can I get my 240v from tap connections on a 480 v120/208v delta y transformer? If not what kind of transformer do I need. 150 kva
Submitted: 1 year ago.
Category: Electrical
Expert:  ProGrade replied 1 year ago.

Welcome to justanswer.com.

Can I get the make & model of the transformer? Thank you Ken

Customer: replied 1 year ago.
I have not purchassed the correct transfomrmer yet. The one I bought and installed I am prety shure will have to be replaced. It is Square D ee150t6h from Cain Electric and is Delta, Delta. I have to replace it asp as buisness wants to open.
Expert:  ProGrade replied 1 year ago.

I am looking it up, please stand by. May/may not accept phone call at that time. Thank you

Expert:  ProGrade replied 1 year ago.

You are correct. This transformer is strictly 480 x 240 (not 240/120)

Correct transformer would be EE150T151HCT for 480 x 240/120 (or similar/equivalent)

The one you have would run all 240V single phase equipment and all 240V 3-phase equipment but not the 120V loads as it does not have a center tap for a neutral. If you use this transformer temporarily for these 240V loads, you would have to disconnect all 120V breakers as they would be getting 240V. Proceed with caution if you do this.

Customer: replied 1 year ago.
Will transformer ee150t151hct 's primary operate on 480 3 phase 3 wire, or does it require 480 3 phase 4 wire?
Expert:  ProGrade replied 1 year ago.

Requires a ground. You seemed to indicate that you have a ground. It does not need a neutral on the primary only a ground.

Customer: replied 1 year ago.
good thank you!
Expert:  ProGrade replied 1 year ago.

You are very welcome. Hope the best for you with the change out.

Customer: replied 1 year ago.
No high leg Im hopeing on EE150TA51HCT
Expert:  ProGrade replied 1 year ago.

Yes, high leg. Select a transformer with 120/208Y for no high leg

Customer: replied 1 year ago.
is there any way to get 240volts on 120/208 y from tap conections.
Expert:  ProGrade replied 1 year ago.

Only by adding another transformer

Customer: replied 1 year ago.
what type transformer?
Customer: replied 1 year ago.
is there a transformer that will give me 3 phase 120/240 with a 480volt 3phase primary with only ground no neutral?
Expert:  ProGrade replied 1 year ago.

No, neutral is required.

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