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#184929 02/25/09 09:26 PM
Joined: Mar 2003
Posts: 849
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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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Joined: Aug 2007
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Personally,I have never seen a 277V motor.
So I never gave it a thought.

Joined: Apr 2002
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Ditto on Leland's comment.

You could always refer to the motor nameplate, right?


John
Joined: Mar 2003
Posts: 849
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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.

Joined: Aug 2007
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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.

Joined: Mar 2003
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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.

Joined: Apr 2002
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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
Joined: Feb 2003
Posts: 939
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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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