boosting from 120 to 277
boosting from 120 to 277
(OP)
Is there any such thing as a single phase transformer that you can get 277V (for a lighting circuit) from 120/208 source. Can you get this done with a coulple of buck/boost transformers or is this totally the wrong approach?
The reason for the inquiry is perhaps to save some $ to change out a bunch of expensive 277V 1% dimming ballasts. This is a health care application where I have to put some selcted fluorescent fixtures on a critical branch source that has no 277 within several floors of the main electric room. The load in this case would be real small, around 600VA-1000VA
The reason for the inquiry is perhaps to save some $ to change out a bunch of expensive 277V 1% dimming ballasts. This is a health care application where I have to put some selcted fluorescent fixtures on a critical branch source that has no 277 within several floors of the main electric room. The load in this case would be real small, around 600VA-1000VA






RE: boosting from 120 to 277
I don't like using them because someone else may try to use the circuit for something else and cause trouble. your best bet is to use a standard step up transformer with a panel board. Because you will find that other loads will crop up in the future that need more 277 volts lighting. buck boost are kind of a work around method for one shot application. most people don't use them because they are odd ball and have cause troubles with mis-applications.
RE: boosting from 120 to 277
RE: boosting from 120 to 277
One kVA is about 8½ amperes at 120V and under 4 amps at 277V, and by NEC 450 a transformer with 2-wire primary — 2-wire secondary could be protected by a primary overcurrent device alone.
Typical is www.acmepowerdist.com/pdf/Page%2011.pdf "Group VI".