ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by gfretwell. 09/22/17 10:37 PM
Another generator question
by gfretwell. 09/21/17 02:41 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 09/15/17 11:37 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,884 Are you busy
176,644 Re: Forum
168,550 Need opinion
Who's Online Now
0 registered members (), 52 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#179203 - 07/01/08 08:34 AM Motor Loads (check it out)  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 826
Michigan
250 hp 480 volt three phase
302A
302x125%= 377.5 = 3-500mcm &Gr(per 250.122). 3 inch conduit
Breaker 600A.
125 Hp480 volt 3 phase
156 A
156x125%=195amps = 3-3/0 plus gr. 2 inch conduit
Breaker 250 amp
both either soft starts or VFD.
Wanna check my work guys.
Hair line between Pride & stupidy Right!!!


2017 / 2014 NEC & Related Books and Study Guides

#179205 - 07/01/08 09:12 AM Re: Motor Loads (check it out) [Re: Yoopersup]  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Numbers look OK to me.

Can you send me some Pasties? I could send you some Pepperoni rolls in return.

Tom


Few things are harder to put up with than the annoyance of a good example.

#179206 - 07/01/08 09:14 AM Re: Motor Loads (check it out) [Re: Tom]  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 826
Michigan
You mean the ones that go on yer Nipples.
:)))))


#179207 - 07/01/08 09:20 AM Re: Motor Loads (check it out) [Re: Yoopersup]  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
Originally Posted by Yoopersup
both either soft starts or VFD


80-95% of the time my preference is to use soft starts for starting only applications and to save the VFD's for speed control.


#179208 - 07/01/08 09:44 AM Re: Motor Loads (check it out) [Re: JBD]  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Yoopersup,

I thought you were a uper, not a loper & I mean the ones you eat.

Tom


Few things are harder to put up with than the annoyance of a good example.

#179238 - 07/02/08 04:24 PM Re: Motor Loads (check it out) [Re: Yoopersup]  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
What kind of breaker?
What environment? Wet? Dry?
What ambient temperature?
What type of insulation on the conductors?
No mention of overloads.
Details, Ernie, details- You know how I am.


George Little


Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.017s Queries: 15 (0.003s) Memory: 0.7760 MB (Peak: 0.9232 MB) Zlib enabled. Server Time: 2017-09-23 14:31:30 UTC