AboutJeremy Adams Expertise I can answer basically any question pertaining to the field of electricity, its applications and daily uses, theory, calculations, how to for residential, commercial, and light industrial. I am an inside wireman, therefore I can't help much with questions to do with linework, such as powerlines and distribution switchyards. I can however, answer some questions that have to do with power generation.
Experience I have 15 years in the trade and currently I am employed at TVA Cumberland City Fossil Plant where we generate about 10% of the power used in the Southeast. Of those 15 years, I have wired houses, wired many office complexes, banks, hospitals, schools, industrial applications, and can also install fire alarm systems.
Organizations IBEW Local 429 Member
Education/Credentials 4 yrs Calhoun Occupational Trade Center
Expert: Jeremy Adams Date: 6/8/2008 Subject: 30 AMP power
Question I want to run a 30 AMP line to my side yard to power a travel trailer. distance of about 175 feet. What size wire will I need to use? And do you have any other recommendations?
Answer Don,
The NEC has standards set for voltage drops with a maximum VD of 3%.
Not knowing your intended voltage I will list the 2 most likely for use in a travel trailer.
120 volts/30 amps @ 175' using #4 awg copper has a VD of 3.1 volts which is 2.6%, well within the 3%.
240 volts/30 amps @ 175' using #8 awg copper has a VD of 7.9 volts which is 3.3%, that is borderline but I would say its okay since your incoming voltage is usually a fraction higher than 240 volts.
My suggestion would be to check your exact available voltage and input it into the calculator. Use 175' as the value for 1/2 the total circuit length since a circuit is considered a full loop
Hope this answers your any questions you may have.
Good Luck,
J Adams
