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New tool
by SMOKEYBOB - 02/15/21 04:59 PM
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1 registered members (Scott35),
15
guests, and 19
spiders. |
Key:
Admin,
Global Mod,
Mod
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277Volt single phase Motors
#184929
02/25/09 09:26 PM
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Joined: Mar 2003
Posts: 849
OP
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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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Re: 277Volt single phase Motors
[Re: Yoopersup]
#184931
02/25/09 09:39 PM
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Joined: Aug 2007
Posts: 853
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Personally,I have never seen a 277V motor. So I never gave it a thought.
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Re: 277Volt single phase Motors
[Re: leland]
#184932
02/25/09 09:48 PM
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Joined: Apr 2002
Posts: 7,233
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Ditto on Leland's comment.
You could always refer to the motor nameplate, right?
John
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Re: 277Volt single phase Motors
[Re: HotLine1]
#184934
02/25/09 10:02 PM
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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.
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Re: 277Volt single phase Motors
[Re: Yoopersup]
#184936
02/25/09 10:09 PM
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Joined: Aug 2007
Posts: 853
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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.
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Re: 277Volt single phase Motors
[Re: leland]
#184937
02/25/09 10:14 PM
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Joined: Mar 2003
Posts: 849
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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.
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Re: 277Volt single phase Motors
[Re: Yoopersup]
#184939
02/25/09 10:25 PM
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Joined: Apr 2002
Posts: 7,233
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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
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Re: 277Volt single phase Motors
[Re: Yoopersup]
#184940
02/25/09 10:26 PM
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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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