How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask electrifier Your Own Question

electrifier
electrifier, Master Electrician
Category: Electrical
Satisfied Customers: 1630
Experience:  Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
13036330
Type Your Electrical Question Here...
electrifier is online now
A new question is answered every 9 seconds

I am wiring an outbuiding 200 feet away, the house has a 200

Customer Question

I am wiring an outbuiding 200 feet away, the house has a 200 amp breaker panel connected to 200 feet of #6 underground wire that is connected to my shop,to a 100 Amp breaker panel. Question one is, what is the largest breaker I can run in this outbuiding? In this outbuiding I am wiring a 5 HP. 240 volt planer with maximum draw of 40 amps. and a dust collector 2 HP. 240 volt maximum draw of12 amps, can I run both of these at once? 50 amp breaker for the planer and 30 amp breaker for the dust collector?Last question is,for a 240 volt circut do I run 2 hot wires with a ground? or two hot wires, neutral, and ground?Can the ground be one size smaller than the leads?
Submitted: 5 years ago.
Category: Electrical
Expert:  electrifier replied 5 years ago.
Thank you for asking your question on graphic
You are corresponding with Electrifier - Your personal online "Electrical Consultant"

200 feet of direct burial #6 copper will support 50 amps with a 4% voltage drop. The code recommends no more than 3% drop in a feeder. 40 amps would give you a 3.2% drop.
Your 5 HP motor has a 28 amp draw and you are correct on the 2 HP at 12. For starting purposes you are going to need to start the planer with nothing else running. The starting current will spike to 168 amps momentarily and then drop back. Lighting is going to dim badly in the outbuilding. Flourescent may shut off and come back on. Starting the dust collector with the planer running will also dim your lights but not as badly.
You are really cutting this down below advisable levels with voltage drop included. You need a full 47 amp capacity to be code compliant and you can't get that without almost 5% voltage drop. Increase your 2 current conductors to #4 AWG and you will get 60 amps at 3% drop. This will take care of your needs. The motors don't use a neutral so that load is not critical. Run PVC conduit all the way with 2 #4 and 2 #6 for ground and neutral and all will be good for your installation.
Where did you get the 50 amp and 30 amp breaker ratings? Were they in the equipment as minimum requirements?
We still have to size the feeder breaker to be enough for the entire building with lighting loads included.
This will give you the feeder requirements and suggestions, the breaker sizes will be in the next answer.

  • If you need further clarification on anything I posted, please don't hesitate to ask
  • 100% customer satisfaction is my goal
electrifier, Master Electrician
Category: Electrical
Satisfied Customers: 1630
Experience: Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
electrifier and 3 other Electrical Specialists are ready to help you
Customer: replied 5 years ago.
Thank you for listening, your feedback important, as i want to do the right job however the #6 feed wire is already buried and cannot easily be changed.Can I get away with what is already there?
Customer: replied 5 years ago.
I got the ratings from the electrical suppy store, thinking that if something is rated at 40 amps that 50 amps would do, and if rated at 12 amps that 30 would do, am I mistaken ?So back to my original question, what amp breaker should I run the out building off the house 200 amp panel?
Expert:  electrifier replied 5 years ago.
Thank you for asking your question on graphic
You are corresponding with Electrifier - Your personal online "Electrical Consultant"

The thing about motors is you may get away with a smaller breaker because you start the planer with no load at all and the 5 HP comes into play when you plane wood with it. That being said, I would try a 40 amp breaker for the planer and a 20 for the dust collector. Of course you will need a motor starter for both motors.
For the feeder try a 60 amp breaker. You are allowed to go up to 250% for the load so you could go to 100 amps and be just over 200%. Try the 60 amp breaker and if it works you saved some money because that breaker costs about $7 or 8 and a 100 amp breaker costs about $30. 70 amps is where the price jumps.
Running the motors together will take 47 amps and the #6 is good for that with a 5% voltage drop. If brownouts become a problem with the lighting it's because of the wire size so whoever told you #6 was enough was mistaken. Starting the 5 HP with no load will save you however. It all depends on how hard you push these motors. They will only draw enough to do the job you ask them to do. The 2 HP might be oversized and only draw 8 amps but you don't know until you run the equipment. You now know what you are allowed to do within the code and what you should have done for ideal circumstances. Good luck and come back if you have more questions. I'll be happy to help you thru anything you come up against.
  • If you need further clarification on anything I posted, please don't hesitate to ask
  • 100% customer satisfaction is my goal
Customer: replied 5 years ago.
sorry it took so long for me to get back to you, as we had 2 feet of snow since I last contacted you. I just want to thank you for all the Info you supplied me with. If need be I will contact yiou in the Future. Enjoy your life!
Expert:  electrifier replied 5 years ago.
Thank you for asking your question on graphic
You are corresponding with Electrifier - Your personal online "Electrical Consultant"

Thanks so much. We've had a foot of snow the past few days in Michigan. Lake effect is so much fun.

  • If you need further clarification on anything I posted, please don't hesitate to ask
  • 100% customer satisfaction is my goal

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
< Last | Next >
  • http://ww2.justanswer.com/uploads/mikepettinato/2009-9-4_41145_DSC005132.jpg Mike's Avatar

    Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
  • http://ww2.justanswer.com/uploads/WI/WireitUp/2012-6-17_18212_Photo00006.64x64.jpg Jason's Avatar

    Jason

    Service Technician

    Satisfied Customers:

    3278
    Over 15 years of experience in all types of installations, troubleshooting, and repairs.
  • http://ww2.justanswer.com/uploads/MI/MikeG2010/2012-6-7_192640_IMG01612.64x64.jpg Mike G.'s Avatar

    Mike G.

    Master Electrician

    Satisfied Customers:

    5318
    Proven Professional 45 years Experience
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Master Electrician

    Satisfied Customers:

    2149
    Contractor-40 Years in the ElectricalTrade
  • http://ww2.justanswer.com/uploads/electrifier/2008-12-16_200429_headbob1.jpg electrifier's Avatar

    electrifier

    Master Electrician

    Satisfied Customers:

    1454
    Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Master Electrician

    Satisfied Customers:

    1115
    Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain
  • http://ww2.justanswer.com/uploads/UR/urelectrician/2012-9-28_223652_JustAnswerPic.64x64.jpg Kevin's Avatar

    Kevin

    Licensed Electrician

    Satisfied Customers:

    993
    27 years as a Licensed Electrical Contractor in Illinois, 5 year college Electrical Instructor, Former Electrical Inspector, Diploma in Digital Electronics, Former Illinois Licensed Home Inspector
 
 
 
Chat Now With An Electrician
electrifier
electrifier
Owner - Contractor
1455 Satisfied Customers
Electrical contractor and electrical inspector for over 24 years with phone and networking expertise