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 Inactive Your Own Question

Inactive
Inactive, Electrician
Category: Home Improvement
Satisfied Customers: 4772
Experience:  ----------JA Verified Electrical Expert!!----------
Type Your Home Improvement Question Here...
Inactive is online now
A new question is answered every 9 seconds

I want to put in a 300 amp electrical service in my work ...

Customer Question

I want to put in a 300 amp electrical service in my work shop. What are the specifications to install a service of this size?
Submitted: 6 years ago.
Category: Home Improvement
Expert:  Gary replied 6 years ago.

Hi There,

To be able to build a 300 amp service, you will need equipment that is rated for at least 300 amps. Since this is not a standard size, you will need to build it using 400 amp equipment. Use a 400 amp rated fusebox, and install 300 amp fuses in it. The service entrance conductors will be rated at least 300 amps. From the fusebox you can run 300 amp wire to a 400amp rated breaker box, using the lugs, or you could run into 2 200amp rated breaker boxes, again, using the main lugs. Most power suppliers will allow a feed thru type meter setup for 400 amps, but you should check with them.

Also you will need to check with your local/county/state electrical codes for other specifications and permits required to put in a service. Also it never hurts to contact an electrician or electrical inspector.

Expert:  Inactive replied 6 years ago.

Thank you for asking your question on graphic

You are corresponding with Joseph - Your personal On-Line “Electrical Consultant”

A 300 amp service for your workshop is extremely large. This type of service is larger than what most people have on their homes for their main electrical services. If this is a workshop at your residence, I would suggest you putting in a 100amp service fed from your main service in your home.

If this is a workshop such as one you would fine with a commercial sized workshop, you will want to install a 400amp meter main. Its actually known as a 380amp service, but the industry just referrs to it as 400amp. This type of service will have the meter and main breakers right in it. Then you can run your wiring for your sub panels directly from the new service.

Now before telling you exactly what you need to do along with how to go about doing it, I will need to know the following information:

(1) Is this workshop at your home? If so is the workshop attached to the home or is it detatched from the home.

(2) What type of electrical equipement are you going to install in your shop? Example is 20 lights, table saw, lathe, drill presses etc. Also I would need to know the approx amperages for what your installing

(3) Is your equipment single phase or three phase. This will make a big difference in what type of service you need.

(4) Is the wiring going to be run overhead or underground.

Once I have this information - I will be able to (1) recommend what size electrical service you ned (2) tell you what permits you will need to pull (3) tell you exactly how to do it along with a materials list so you can pick this equipment up for any home improvement store and or electrical supply house. (4) I will then be able to provide you with a detailed diagram shoing you how to wire up your new service, from your main panel out to your new panel.

Hope this helps you out. If you need further assistance with this question or just need further clarification - please don’t hesitate to ask.

***I am a Verified state "Licensed" electrical contractor, not an internet researcher - I will work hard to give you the exact answers you seek and work you through any problem you may have***

Please press the “Accept” button if my answer has helped. This is the only way I get paid for providing my services.

100% customer satisfaction is my goal!!!!!

Inactive, Electrician
Category: Home Improvement
Satisfied Customers: 4772
Experience: ----------JA Verified Electrical Expert!!----------
Inactive and 3 other Home Improvement Specialists are ready to help you

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
  • Thank you for the expeditious answer. It's good to know you're out there and awake in the wee hours when I finally have time to ask questions about my Jenn Air. Jean Riverhead, NY
  • 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
 
 
 

Meet The Experts:

 
 
 
  • The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/TH/TheHomeSmithy/2011-8-13_11146_homesmithy.500x500.64x64.jpg The Home Smithy's Avatar

    The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
  • http://ww2.justanswer.com/uploads/BS/bshull17/2011-2-11_04125_japic.64x64.JPG Brian's Avatar

    Brian

    Architect

    Satisfied Customers:

    1967
    Licensed Architect- 16 years, L.E.E.D. AP
  • http://ww2.justanswer.com/uploads/ST/Steve555/2013-6-14_144343_Depositphotos4247517S.64x64.jpg Steve G.'s Avatar

    Steve G.

    Handyman

    Satisfied Customers:

    135
    VP of electronic repair company and home theater advisor.
  • http://ww2.justanswer.com/uploads/ER/Erdaram/2011-6-21_14724_ANIEric4Pics.64x64.gif Eric M. Bright's Avatar

    Eric M. Bright

    We Don't Comprehend the Word Can't!

    Satisfied Customers:

    1734
    I've been been doing things for my clients that others have said cant be done for over a 1/4 Century
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Home Improvement Enthusiast

    Satisfied Customers:

    674
    Over 35 years construction and home maintenance experience
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    409
    Retired contractor, 51 years experience
  • http://ww2.justanswer.com/uploads/JE/jerrymassie/2011-1-15_45937_1111055.64x64.JPG Jerry's Avatar

    Jerry

    hearth products

    Satisfied Customers:

    317
    owned and operated stove retail and service 12 yrs