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277Volt single phase Motors #184929
02/25/09 09:26 PM
02/25/09 09:26 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 849
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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Re: 277Volt single phase Motors [Re: Yoopersup] #184931
02/25/09 09:39 PM
02/25/09 09:39 PM
L
leland  Offline
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
Personally,I have never seen a 277V motor.
So I never gave it a thought.

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

Member
Joined: Apr 2002
Posts: 7,038
Brick, NJ USA
Ditto on Leland's comment.

You could always refer to the motor nameplate, right?


John
Re: 277Volt single phase Motors [Re: HotLine1] #184934
02/25/09 10:02 PM
02/25/09 10:02 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 849
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.

Re: 277Volt single phase Motors [Re: Yoopersup] #184936
02/25/09 10:09 PM
02/25/09 10:09 PM
L
leland  Offline
Member
Joined: Aug 2007
Posts: 853
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.

Re: 277Volt single phase Motors [Re: leland] #184937
02/25/09 10:14 PM
02/25/09 10:14 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 849
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.

Re: 277Volt single phase Motors [Re: Yoopersup] #184939
02/25/09 10:25 PM
02/25/09 10:25 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,038
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
Re: 277Volt single phase Motors [Re: Yoopersup] #184940
02/25/09 10:26 PM
02/25/09 10:26 PM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
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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