The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
Texas_Ranger 8
Trumpy 8
sparkyinak 7
Who's Online
1 registered (LongRunner), 90 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#47507 - 01/18/05 05:14 AM 1/2 part winding motor
Joe Carpenter Offline
Member

Registered: 12/19/01
Posts: 55
Loc: USA
Hi,
I have a 50hp 3 phase 460 volt (single voltage) 1/2 part winding motor with six leads. The control panel is set up with 2 starters. When starting the system, the first set of windings (1-2-3) is energized. After a small delay the second set is energized (7-8-9). This effectively creates a soft start setup.

My question is, What size should the six conductors be that go from the starters to the motor?. The motor is located about 40 feet away from the control panel. The motor nameplate shows 61 amps.


This was a setup that we bought used. It was previosly setup using #6 conductors for the six leads.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#47508 - 01/18/05 12:09 PM Re: 1/2 part winding motor
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
Joe,

The conductors on the secondary side of the motor controller can be selected based on 50% of the full load current of the motor. See 460.22D

#8 should do the trick

Tom
_________________________
Few things are harder to put up with than the annoyance of a good example.

Top
#47509 - 01/23/05 07:34 AM Re: 1/2 part winding motor
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Joe,

Are you sure it is a "Part winding" starter and not a "Wye-Delta" starter?
I thought "part-winding" control was only suitable on the lower voltage of dual-voltage motors, where the windings are connected in parallel?

Top
#47510 - 01/23/05 10:01 AM Re: 1/2 part winding motor
Joe Carpenter Offline
Member

Registered: 12/19/01
Posts: 55
Loc: USA
Yes,
It is a Lincoln Electric Motor. I also got some supporting information off their website.
Thanks for your help

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals