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#184929 - 02/25/09 06:26 PM 277Volt single phase Motors
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
Why isn't there an Amperage chart on theses motors in the code book???
430.248 just goes up to 230 volts???

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#184931 - 02/25/09 06:39 PM Re: 277Volt single phase Motors [Re: Yoopersup]
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
Personally,I have never seen a 277V motor.
So I never gave it a thought.

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#184932 - 02/25/09 06:48 PM Re: 277Volt single phase Motors [Re: leland]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
Ditto on Leland's comment.

You could always refer to the motor nameplate, right?
_________________________
John

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#184934 - 02/25/09 07:02 PM Re: 277Volt single phase Motors [Re: HotLine1]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
Per 430.6 (A)1 all amperages except for overloads & few exceptions are to come out of tables in Code book.
Since no Table with 277V I guess well have to use Nameplate for all calculations??
And yep theres 277Volt Motors Goggle um there there. These are on a Heat Pump System.

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#184936 - 02/25/09 07:09 PM Re: 277Volt single phase Motors [Re: Yoopersup]
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
I've seen those and other type units. Also in them was a transformer to step down.

Google was the first thing I did. Always nice to find something new.

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#184937 - 02/25/09 07:14 PM Re: 277Volt single phase Motors [Re: leland]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
Been in the trade almost 45 years have Never before this time ever Seen or Knew there were 277 volt mtrs. Guess never to late to learn right.

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#184939 - 02/25/09 07:25 PM Re: 277Volt single phase Motors [Re: Yoopersup]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
It's never to late, & we're never to old to learn. We come here to do that, right???

Yes, as there is no table to use, go to 110.3 (B) and use the nameplate.
_________________________
John

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#184940 - 02/25/09 07:26 PM Re: 277Volt single phase Motors [Re: Yoopersup]
frenchelectrican Offline

Member

Registered: 02/06/03
Posts: 938
Loc: Wi/ Paris France { France for ...
There is not a large number of 277 volt motour in use however most common found in HVAC or large electric unit heater AKA electric Renzor heater.

Once a while will find them on the exhaust fan when they are tied to bathroom lighting circuit { this is a grey spot to cross }

The other common place to find 277 volt motor is thru wall heatpump when they are order on 277 volt system.

Merci,Marc
_________________________
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


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