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#179203 - 07/01/08 05:34 AM Motor Loads (check it out)
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: 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!!!

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#179205 - 07/01/08 06:12 AM Re: Motor Loads (check it out) [Re: Yoopersup]
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: 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.

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#179206 - 07/01/08 06:14 AM Re: Motor Loads (check it out) [Re: Tom]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
You mean the ones that go on yer Nipples.
:)))))

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#179207 - 07/01/08 06:20 AM Re: Motor Loads (check it out) [Re: Yoopersup]
JBD Offline
Member

Registered: 07/12/01
Posts: 599
Loc: 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.

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#179208 - 07/01/08 06:44 AM Re: Motor Loads (check it out) [Re: JBD]
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: 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.

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#179238 - 07/02/08 01:24 PM Re: Motor Loads (check it out) [Re: Yoopersup]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: 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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