Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Discussion Forum

Which Wire

Welcome Guest, Log in or Register
Author 
Iron Horse

01-05-2001 11:51:02




Report to Moderator

Have an 5HP AC 220V Electric Motor with no wires need to know what size I should use? Maybe 10awg
also amps are about 25 thanks




[Log in to Reply]   [No Email]
IC

01-06-2001 18:58:45




Report to Moderator
 Re: Which Wire in reply to Iron Horse, 01-05-2001 11:51:02  
25 amps sounds high for a 5hp motor at 220 volts. I have a 5hp compressor on 120v and it is connected to a 20 amp breaker, and #12 wire. Is this motor a dual voltage motor 120/220v ? When you use a higher voltage like 220v you should have lower current in which you could use smaller wire and a smaller breaker. This is why bigger appliances such as ovens use 220v because it would take wire nearly twice the size to be able to supply the current on 120v. Hope this helps.

[Log in to Reply]  [No Email]
Old Sparky

01-08-2001 18:15:28




Report to Moderator
 Re: Re: Which Wire in reply to IC, 01-06-2001 18:58:45  
25 amps is about right for a true 5 HP motor at 240 volts. Some of the imported stuff and cheaper compressors call motors 5 Hp at 15 amps. Bovine Scatology! An electric induction motor will develop about twice it's rated HP for a short time with a big increase in the amperage drawn. These 15 amp 5HP motors will deliver that Hp for only a few minutes before serious overheating. The 25 amp 5 HP will deliver that HP all day without overheating. The 15 amp motor is not a 5 HP. The 25 amp motor will deliver about 10 Hp for brief periods of time. A 75 HP electric on a sawmill will outsaw a 100 HP diesel any day. The diesel is peak Hp while the electric will peak at about 150 HP. The sawmill is not a continuous load, so the electric motor does well.

[Log in to Reply]  [No Email]
IC

01-10-2001 16:59:03




Report to Moderator
 Re: Re: Re: Which Wire in reply to Old Sparky, 01-08-2001 18:15:28  
Yor are correct on this, I was going on what was on the name plate for my compressor (must be the cheap one). As for the amperage I guess a person needs to go by the nameplate on the motor itself. If I remember correctly 1 Horsepower = 746 watts. So the formula for Watts (power) is P=IxE With P=power or watts and I=current and E=voltage. Then a 5 hp motor should use (5x746=3750watts), and at 3750watts divided by 240 volts = 15.62amps at 240volts, and 31.25 amps at 120volts. " Hope I did not confuse anyone on this".

[Log in to Reply]  [No Email]
Old Sparky

01-05-2001 15:36:31




Report to Moderator
 Re: Which Wire in reply to Iron Horse, 01-05-2001 11:51:02  
Motors have a delicate digestive system- underfeed them and there will be big problems. Bill makes a good point, but #10 should be OK for intermittent running and not over 25 feet. #8 should be OK for up to 100 feet.



[Log in to Reply]  [No Email]
ltf in nc

01-05-2001 15:21:25




Report to Moderator
 Re: Which Wire in reply to Iron Horse, 01-05-2001 11:51:02  
Amps on the 5 hp motor should be about 17 amps unless the motor is being overloaded.



[Log in to Reply]  [No Email]
Bill Oakes

01-05-2001 12:53:12




Report to Moderator
 Re: Which Wire in reply to Iron Horse, 01-05-2001 11:51:02  
The book will say that #10 will do it. I would run minimum of #8, #6 for a run over 40-50 ft. Voltage drop and I2R losses are usually under-estimated by many people. This advice comes from a 54 year old master electrician that has seen it all; hope it helps. Bill



[Log in to Reply]  [No Email]
paul

01-05-2001 20:35:07




Report to Moderator
 Re: Re: Which Wire in reply to Bill Oakes, 01-05-2001 12:53:12  
Hey, how about some general advise? Just looking for the sake of planning & number crunching, I'm not asking how to be an electrician or avoiding paying the guys that know what they are doing. Just want to know enough to know what to ask.

The old farm place is wired with 8g wires, and has a 60 amp service. I'm trying to figure out if it's worth upgrading this, and to what to upgrade to. Some of the overhead wire runs are 300 feet or so, but then the end buildings only use lights & a 1 hp motor. I have some cattle, and am looking to put in a better grain drying/ handling setup (that would be 150 feet from the meter, if these lengths matter?).

What should I be thinking about? (I'm thinking of not even bothering, on what farming returns these days...) Thanks,

--->Paul

[Log in to Reply]  [No Email]
Jim K

01-07-2001 07:28:25




Report to Moderator
 Re: Re: Re: Which Wire in reply to paul, 01-05-2001 20:35:07  
A 60 amp service requires at least a #6 conductor
I'm not saying you should stay with a 60 amp service. sounds like you might want to upgrade
to 100 or 200amp. I think your main concern would be dust and explosion proof wiring since you want
to do grain drying and storage that is a whole other can of worms according to the national electrical code. get some expert advice from a local electrician.Have him come and look at the whole picture and he'll be able to tell you what you need to do. Hard to tell from here. Don't mess with fire if'n your not a fireman.
Jim K

[Log in to Reply]  [No Email]
T_Bone

01-07-2001 04:47:42




Report to Moderator
 Re: Re: Re: Which Wire in reply to paul, 01-05-2001 20:35:07  
Hi Paul, I would say a 200amp service cause your are always going to add something on the farm. This way you won't have to upgrade for quite awhile. Yes it does make a difference on the length of run as to the size of the wire. Your local utility controlls the wire size if it's a main service.

T_Bone



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy