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: 7097
Experience:  Proven Professional 46 years Experience
29848548
Type Your Electrical Question Here...
Mike G. is online now
A new question is answered every 9 seconds

I want to power a 30 watt lamp in my driveway that is 750'

Customer Question

I want to power a 30 watt lamp in my driveway that is 750' from my house. What size wire will I need?
Submitted: 1 month ago.
Category: Electrical
Expert:  Eddie replied 1 month ago.

Hi ..................14/2 UF-B cable (underground wire)........you would need to purchase a reel of it for one whole wire ......unless you wanted to make it as a runway type with a few more lights

Customer: replied 1 month ago.
Whats the maximum wattage at 750 feet I could use?
Expert:  Eddie replied 1 month ago.

that I am not sure of ...........so I will opt out and let one of my esteemed colleagues answer........please dont reply until you get a response or it will only delay an answer for you ............good luck

Expert:  Mike G. replied 1 month ago.

Hi, I'm Mike G and I'll be assisting you. Stand by while I do the calculation.

Expert:  Mike G. replied 1 month ago.

At that distance to keep the voltage drop under 3% you'll need a #1 copper wire or a 2/0 Alum wire.

Customer: replied 1 month ago.
The other guy said 14/2 would work for 30 watts of power at 750 feet?
Expert:  Mike G. replied 1 month ago.

The other guy was wrong. A 15A 120V circuit requires the wire stated. 14/2 will only give you 51V.