277V Step down XFMR

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CliffD

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Location
San Antonio, TX
Hello all,
Any help on this would be appreciated.
If I put a 277V step down XFMR to 120V to feed some 120V fixtures (lightolier #7997) on the same circuit with 277V fixtures; will this work with two different voltages feeding back on the same neutral?
I found this transformer (see attached) that looks like will accomplish this, but all of my colleagues tell me it won't work due to the neutrals.
Any thoughts?

Thanks,
Cliff
 

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david luchini

Moderator
Staff member
Location
Connecticut
Occupation
Engineer
It appears you have a buck-boost autotransformer. The autotransformer will need an input fuse not greater than 1.8A per 450.4(A)Exc. Can't tell if its supplied with the transformer from the cuts.

But I don't see any reason that it wouldn't work together with other fixtures on the same 277V branch circuit.
 
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