Is 6 awg wire enough for 130' to a hot tub

bojahJanuary 26, 2011

I am running wire for a future hot tub and was wondering if 6 awg is enough? The hot tub calls for 4 wire, 240 volt, 50 amp. The run is 130' (110' indoor and 20' outdoor) using 1" liquid tight conduit.

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kurto

According to my calculations, at 130', you'll see a 2.5% voltage drop using 6 gauge copper wire with a 50A load. That should be just fine. I use http://www.nooutage.com/vdrop.htm as a calculator, so you can check my work.

Here is a link that might be useful: www.nooutage.com

    Bookmark   January 26, 2011 at 11:20PM
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bojah

Thanks a ton Kurto. I have been getting many opinions and didn't feel that anything thicker that 6 guage was needed.

    Bookmark   January 26, 2011 at 11:27PM
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bojah

Question: Is it a code violation to use single colored wires?

    Bookmark   January 27, 2011 at 12:13AM
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Ron Natalie

For #6 and smaller wires, you must use white and green insulation for the neutral (if present) or ground, respectively.

You're free to use any color but white and green for the hot legs (and there's no requirement that different legs be different colors).

    Bookmark   January 27, 2011 at 9:33AM
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kudzu9

ronnatalie-
In a situation like this, can you use a white wire for a hot leg if you wrap it at each end with colored electrical tape to "change" the color, or must the entire jacket be colored?

    Bookmark   January 27, 2011 at 1:32PM
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Ron Natalie

You can mark a white wire black at the termination and all other points of access if you use it for a hot leg.

You can not remark a wire white to use it for the neutral.
You can not remark a wire green to use it for the ground.
You can not use a bare ground for the hot tub installed outdoors.

    Bookmark   January 27, 2011 at 3:30PM
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Ron Natalie

You can't remark a green wire either.

    Bookmark   January 27, 2011 at 5:31PM
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normel

And you can only remark wire if it is part of a cable assembly and is to be used for switch loops, NOT individual conductors.

    Bookmark   January 28, 2011 at 11:41AM
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Ron Natalie

Actually it doesn't have to be part of a switch loop (it does have to be part of a cable). The code says *IF* you use it for a switch loop, it can only be for the supply *TO* the switch not for the return to the outlet.

Older code versions let you use white for the switch loop feed without even bothering to remark it.

    Bookmark   January 28, 2011 at 11:53AM
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brickeyee

"And you can only remark wire if it is part of a cable assembly and is to be used for switch loops, NOT individual conductors."

Not true at all, especially for larger wires.

Wires pulled into conduit are routinely re-marked to indicate phases, neutrals, etc.

Very large conductors are often available in ONE color --- BLACK.

    Bookmark   January 28, 2011 at 4:01PM
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Ron Natalie

That only applies for larger than #6.

    Bookmark   January 28, 2011 at 5:51PM
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Ron Natalie

Nope actually brick, you can't EVER remark a white wire other than inside a cable. DOesn't matter if it's 0000.

Greater than #6 you can remark the non-white, non-green wires to another color.

    Bookmark   January 28, 2011 at 5:53PM
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brickeyee

That is not was was stated.

While the cases for remarking a white or green are limited, the remarking of larger wires to indicate they are a neutral or ground is allowed outside of cables and for larger wire sizes, many of which only come in black.

When I wanted bare 1500 MCM for a lightning down wire system luckily I needed enough to purchase an entire spool (the 4 foot wooden variety) because I had to get it made that way.

It blended into the brick on the face of the building nicely, instead of being an ugly black line.
We had to get a well drilling company to make a hole large and deep enough for the grounding rods.

    Bookmark   January 29, 2011 at 9:05AM
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