Hello,I want to place a 30 amp breaker in the panel of my house and then run about 200 ft of uf-b cable to a 30 amp rv outlet that I will place near my travel trailer. I would like to have the ability to use my travel trailer the same way as I would if I were at a full hookup campground. What gauge wire should I use?Thank you!

Within reason no determent to using a larger gauge wire than the minimum.

Wonderful calculator at calculator.net. Voltage Drop Calculator. Plug in Amperage used, distance and wire gauge and it will tell you the voltage drop in volts and percent. If you drop to 105vac, you will be on the edge of damaging electric controls in your appliances. Voltage loss will depend on actual amperage used on that length and gauge wire. Having an Electrical Management System like a Progressive Industries one will tell you actual voltage and protect from out of spec power. Even a Kil-a-watt via a 15-30 amp adapter will let you know of power variations as you turn on different appliances.

GordonThree wrote:6/3 or heavier for the future.With ground.4 total conductors.One spare unused with the 30 amp application.

A search took me to: http://www.paigewire.com/pumpWireCalc.aspx where they recommended 4 AGW copper or 2 AGW aluminum for a 120 volt, 30 amp circuit at 200 ft with 3% tolerance. Change the tolerance to 5% and you can get by with 6 AGW copper wire.http://wiresizecalculator.net/ came back with 3 AGW copper wire with a 3% tolerance or 6 AGW for 5% tolerance for direct burial.3% of 120 = 3.7 volts - 120v - 3.7 = 116.3v5% or 120 = 6 volts - 120v - 6 = 114vI'd use the 5% tolerance figures.https://www.calculator.net/voltage-drop-calculator.html?material=copper&wiresize=1.296&voltage=120&phase=ac&noofconductor=1&distance=200&distanceunit=feet&amperes=30&x=48&y=29 Agrees with these figures.

What gauge wire do I use | Good Sam Community

Cummins12V98
Explorer III
Jul 15, 2019
shastagary wrote:
"W" stands for water resistant

THANK YOU!!!

So I stand by what my Journeyman Electrician friend told me! Use THWN if using conduit underground no matter how well you THINK you have it sealed!

Chum lee why didn't you post this info???
shastagary
Explorer
Jul 15, 2019
"W" stands for water resistant
Cummins12V98
Explorer III
Jul 15, 2019
Cummins12V98 wrote:
Dusty R wrote:
THHN and THWN is the same wire.

BOTH submersion rated?

No answer???
Bobbo
Explorer II
Jul 15, 2019
Dusty R wrote:
THHN and THWN is the same wire.

Not EXACTLY true. THWN wire is also THHN rated. THHN wire may or may not be THWN rated. Read the label before you buy the wire.
Cummins12V98
Explorer III
Jul 13, 2019
Dusty R wrote:
THHN and THWN is the same wire.

BOTH submersion rated?
zcookiemonstar
Explorer
Jul 13, 2019
When you run your conduit use some rope and pull it through each section as you glue or screw your conduit together. When your done use the rope to pull your wire through. Consider conduit big enough for future upgrades. You may get a larger trailer one day that requires a 50 amp service.
MEXICOWANDERER
Explorer
Jul 13, 2019
With plastic conduit, SAND the glue joints, then assemble with glue.

Wait you're not done.

Seal the seams with Shoo Goo. But anywhere the glop is applied it has to be sanded first. Don't try it with silly-cone
Campin_LI
Explorer
Jul 13, 2019
Got my answer. If I bought 6/3 uf-b cable, it would come with a 10 gauge ground wire so I guess my answer is a 10 gauge thhn wire would work for the ground.
Dusty_R
Explorer
Jul 13, 2019
THHN and THWN is the same wire.
Cummins12V98
Explorer III
Jul 12, 2019
Not an expert on this BUT is THHN rated for submersion??? Don't be fooled your conduit WILL get water in it! I just had this happen. My Journeyman Electrician Friend said I need to replace my wire in my SEALED conduit with THWN since my Black/HOT wire has grounded out.

I was WERY careful gluing it together.

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What gauge wire do I use

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