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 Mike G. Your Own Question
Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7599
Experience:  Proven Professional 48 years Experience
29848548
Type Your Electrical Question Here...
Mike G. is online now
A new question is answered every 9 seconds

I'am bldg a house i'm putting a 400 amp system in but I want

Customer Question

I'am bldg a house i'm putting a 400 amp system in but I want to go back farther on my land how far in feet can I go to get to a 200 amp system thanks
Submitted: 1 year ago.
Category: Electrical
Expert:  Mike G. replied 1 year ago.

Hi, I'm Mike G and I'll be glad to assist you. It would be easier to give you the information if you told me how far you want to go.

Customer: replied 1 year ago.
I'am not sure at least 200 ft more if we can
Expert:  Mike G. replied 1 year ago.

You need to give me s specific distance from the pole to the house, not 200 ft more. More than what?

Customer: replied 1 year ago.
From pole 110 ft put in power co. Elect. Box than they say I have 120ft to box in house rated at 370 amp from there i only need a 200 amp box but I don't know how far from there the wire causes the amps to go dn to 200 amps I don't know how to explain it any better if you need more info just text me back I will try .I thought maybe there's a formula thanks
Expert:  Mike G. replied 1 year ago.

There is a program electricians use. Knowing the distance, type of wire and size of the required service it calculates the wire size. I need the distance you want.

Customer: replied 1 year ago.
250 ft thanks
Expert:  Mike G. replied 1 year ago.

You'll need 400MCM Aluminum for that distance. A 400A system would need 500MCM, so you can use what was speced for 250ft.

Customer: replied 1 year ago.
Thank you
Expert:  Mike G. replied 1 year ago.

You're welcome. Let me suggest that you do the service in PVC conduit.to avoid a failure in the future. Cheap insurance.