Motor Loads (check it out)

ECN Shout Chat

Give a Shout Out!

ShoutChat

Who's Online Now

0 members (), 14 guests, and 11 robots.

Key: Admin, Global Mod, Mod

Print Thread

Rate Thread

Motor Loads (check it out)

#179203 07/01/08 08:34 AM

Joined: Mar 2003

Posts: 849

Michigan

Y

Yoopersup

OP

Member

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!!!

Stay up to Code with the Latest NEC:

2020 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with these Exam Prep Combos:

>> Master Electrician Exam Prep >> JourneyMan Electrician Exam Prep

Re: Motor Loads (check it out)

Yoopersup #179205 07/01/08 09:12 AM

Joined: Jan 2001

Posts: 1,044

Shinnston, WV USA

Tom

Member

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)

Tom #179206 07/01/08 09:14 AM

Joined: Mar 2003

Posts: 849

Michigan

Y

Yoopersup

OP

Member

You mean the ones that go on yer Nipples.
:)))))

Re: Motor Loads (check it out)

Yoopersup #179207 07/01/08 09:20 AM

Joined: Jul 2001

Posts: 599

WI, USA

J

JBD

Member

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)

JBD #179208 07/01/08 09:44 AM

Joined: Jan 2001

Posts: 1,044

Shinnston, WV USA

Tom

Member

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)

Yoopersup #179238 07/02/08 04:24 PM

Joined: Jan 2004

Posts: 1,507

Michigan USA

G

George Little Offline

Member

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

Moderated by dougwells, electure, gfretwell, HotLine1, Scott35, Trumpy

Link Copied to Clipboard

Featured:

Tools for Electricians

* * * * * * *

2023 NEC Now Available!

* * * * * * *

2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

Member Spotlight

CDS
Nicholson Ga

Posts: 34
Joined: June 2006

ECN Forum Forums Code Related Discussion NEC & other Code issues Motor Loads (check it out)