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#179203 - 07/01/08 07:34 AM Motor Loads (check it out)  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 840
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 08:12 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 08:14 AM Re: Motor Loads (check it out) [Re: Tom]  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 840
Michigan
You mean the ones that go on yer Nipples.
:)))))


#179207 - 07/01/08 08:20 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 08:44 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 03:24 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


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