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Open Roads Forum  >  Tech Issues

 > What gauge wire do I use

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MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 07/12/19 12:49pm Link  |  Quote  |  Print  |  Notify Moderator

If MONEY is the issue use 3AWG aluminum wire. But bare aluminum MUST MUST MUST be connected to TIN before it then connects to copper. Tin-plated aluminum works. Tin plated copper works. But the interface must be sealed water-tight outdoors.

Bare copper or SOLDER does not work. Aluminum is 4-alarm fire, fussy.

And remember the THIRD WIRE for earth ground can be #12 CU COPPER or #10 AL ALUMINUM

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Cummins12V98

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Posted: 07/12/19 03:57pm Link  |  Quote  |  Print  |  Notify Moderator

Chum lee wrote:

Cummins12V98 wrote:

"If you want someone to come and steal your copper wire, use 4 gauge."

I think he mentioned underground wire.


You need to get out more. At $2.30/lb. (currently), 3 - #4 copper wires add up fast. (a rhetorical question) What makes you think that if something is buried in conduit, (even directly) it's safe from theft? It happens all the time, nice long runs make it even more appealing.

Chum lee


If running underground to my 50A RV outlet I would run THWN copper stranded wire in conduit. I think it's highly unlikely anyone would go to the trouble of stealing it. Certainly not in areas I frequent.

Sorry no one in their right mind would run #4 for a 200' run for a 30A load.


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Campin LI

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Posted: 07/12/19 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

Everyone, thank you for all this advise. Since I am getting in deep on this, I have expanded the project slightly. The run remains at 200' (195' to be exact). I am thinking of doing this with thhn wire in conduit. I will run 6 gauge for trailer, an additional 10 gauge wire for a 20 amp outlet and a 6 gauge neutral wire. What gauge should my ground wire be? Should any of the wire gauges I mentioned above be altered? I am planning stranded copper. I'll price out the difference of this setup vs running 6/3 uf-b cable. Maybe I'm wastying my efforts and the uf-b cable would just be cheaper. Don't know. thinking outloud.

Thanks!

Cummins12V98

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Posted: 07/12/19 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Dusty R

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Posted: 07/12/19 06:03pm Link  |  Quote  |  Print  |  Notify Moderator

THHN and THWN is the same wire.

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Posted: 07/12/19 07:13pm Link  |  Quote  |  Print  |  Notify Moderator

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.

MEXICOWANDERER

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Posted: 07/12/19 07:30pm Link  |  Quote  |  Print  |  Notify Moderator

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

zcookiemonstar

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Posted: 07/12/19 11:20pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Cummins12V98

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Posted: 07/13/19 10:42am Link  |  Quote  |  Print  |  Notify Moderator

Dusty R wrote:

THHN and THWN is the same wire.


BOTH submersion rated?

Bobbo

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Posted: 07/15/19 01:59pm Link  |  Quote  |  Print  |  Notify Moderator

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.


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