ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Ground Rods: Installation and Hook-Up
by NORCAL - 11/26/22 12:17 AM
Happy Thanksgiving all!
by Bill Addiss - 11/24/22 08:37 AM
Colt Firearms Switchbox
by sabrown - 11/22/22 01:33 PM
Perfect work light?
by gfretwell - 11/22/22 12:48 AM
copper prices where you live and inflation
by gfretwell - 11/21/22 01:52 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
1 members (Scott35), 51 guests, and 45 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#179203 07/01/08 07:34 AM
Joined: Mar 2003
Posts: 849
Y
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
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
 

Joined: Jan 2001
Posts: 1,044
Tom Offline
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.
Joined: Mar 2003
Posts: 849
Y
Member
You mean the ones that go on yer Nipples.
:)))))

Joined: Jul 2001
Posts: 599
J
JBD Offline
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.

Joined: Jan 2001
Posts: 1,044
Tom Offline
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.
Joined: Jan 2004
Posts: 1,507
G
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

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 4,080
Joined: October 2000
Top Posters(30 Days)
NORCAL 3
Trumpy 3
Popular Topics(Views)
300,163 Are you busy
229,921 Re: Forum
214,772 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5