Could be they are rated for 277 but are operating at 240. Or commercial
buildings use 277, but I don't think so.
Tom
> It is really strange, no one heard of 277V? It should be used by many
office
> and industrial building, we sell millions of ECG (electronic ballast for
T5
> and T8 lamp) a year to US in that voltage. That ratio of 120 and 277 is
> almost the same.
>
> C.H.Ling
>
> >
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