ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
You will never guess
by grich - 02/24/21 07:18 PM
Lock-down Thread
by Bill Addiss - 02/24/21 04:40 PM
New tool
by SMOKEYBOB - 02/15/21 04:59 PM
Split Bus Breaker Panel
by gfretwell - 02/15/21 02:30 PM
Sierraplex recpts
by gfretwell - 02/15/21 02:27 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
1 registered members (Scott35), 15 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
277Volt single phase Motors #184929 02/25/09 09:26 PM
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline OP
Member
Why isn't there an Amperage chart on theses motors in the code book???
430.248 just goes up to 230 volts???

2017 / 2014 NEC & Related Books and Study Guides
Re: 277Volt single phase Motors [Re: Yoopersup] #184931 02/25/09 09:39 PM
Joined: Aug 2007
Posts: 853
L
leland Offline
Member
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
Joined: Apr 2002
Posts: 7,233
HotLine1 Offline
Member
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
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline OP
Member
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
Joined: Aug 2007
Posts: 853
L
leland Offline
Member
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
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline OP
Member
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
Joined: Apr 2002
Posts: 7,233
HotLine1 Offline
Member
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
Joined: Feb 2003
Posts: 939
F
frenchelectrican Offline
Member
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?)


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
275,352 Are you busy
209,224 Re: Forum
196,526 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3