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transformer

transformer

transformer

(OP)
I am opening a new fabrication and manchine shop and will have 480/277 service. What will I need for a transformer to get my 220 and 120 single phase?

RE: transformer

A 3-phase step-down transformer with 480V delta primary and 208Y/120V secondary.

220V loads would run fine on 208V. You get 120V between any phase and the neutral. If there a very sensitive 220V equipment, you can use a buck-boost transformer for that particular unit.

Where possible, try to get 208V rated machines.

RE: transformer

Most plants can be operated without 220 (or 240, whatever you want to call it).  You will probably end up with a 45kVA 480 to 208Y/120V three-phase dry-type transformer mounted on a concrete pad on the floor.  At 208V, a 30 kVA xf will serve a 100A main breaker, 45kVA will serve a 150A MB.

William

RE: transformer

Discuss your needs with a utility representative.  They may be able to supply a separate 120/240 volt service economically.

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