ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Calling all Non-US members!! (Non-US only)
by Bill Addiss. 08/13/18 05:52 PM
Upgrade the old panel
by gfretwell. 08/13/18 12:20 AM
depth of duckbank
by ghost307. 08/12/18 09:26 PM
Section 179 vehicle purchases
by BigB. 08/05/18 01:06 PM
Don't you buy this stuff
by BigB. 08/05/18 01:00 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 5 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Motor Loads (check it out) #179203
07/01/08 08:34 AM
07/01/08 08:34 AM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 845
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
Re: Motor Loads (check it out) [Re: Yoopersup] #179205
07/01/08 09:12 AM
07/01/08 09:12 AM
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.
Re: Motor Loads (check it out) [Re: Tom] #179206
07/01/08 09:14 AM
07/01/08 09:14 AM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 845
Michigan
You mean the ones that go on yer Nipples.
:)))))

Re: Motor Loads (check it out) [Re: Yoopersup] #179207
07/01/08 09:20 AM
07/01/08 09:20 AM
J
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.

Re: Motor Loads (check it out) [Re: JBD] #179208
07/01/08 09:44 AM
07/01/08 09:44 AM
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.
Re: Motor Loads (check it out) [Re: Yoopersup] #179238
07/02/08 04:24 PM
07/02/08 04:24 PM
G
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

Featured:

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

 

Member Spotlight
renosteinke
renosteinke
Blue Collar Country
Posts: 5,316
Joined: January 2005
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
248,573 Are you busy
186,301 Re: Forum
175,758 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.021s Queries: 15 (0.004s) Memory: 0.9764 MB (Peak: 1.1244 MB) Zlib enabled. Server Time: 2018-08-17 11:25:55 UTC