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What size junction box to use

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What size junction box to use mighty.miindy 07-07-2006
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Posted by on July 7, 2006, 10:53 am
I am trying to figure out what size junction box I need to connect 6
awg wire.

I went to my local hardware store and the person there looked at me
like I was an idiot, after talking to them for a min I realized they
were the idiot...

Anyways, the biggest box they showed me was a 4x2 1/8 square box, which
I know is just too small. Not enough room to join a 3x6 awg wires.

Basically I have hooked up my hot tub (which is outside) using armor
cable for the outside run then when I ran out of that wire I bought
another 30ft of indoor wire. Obviously the junction box where i am
butt joining the wires is indoors. So basically I just need to know
what size junction box I should be using.

Mighty Miindy


Posted by HeyBub on July 7, 2006, 11:24 am
mighty.miindy@gmail.com wrote:
> I am trying to figure out what size junction box I need to connect 6
> awg wire.
>
> I went to my local hardware store and the person there looked at me
> like I was an idiot, after talking to them for a min I realized they
> were the idiot...
>
> Anyways, the biggest box they showed me was a 4x2 1/8 square box,
> which I know is just too small. Not enough room to join a 3x6 awg
> wires.
>
> Basically I have hooked up my hot tub (which is outside) using armor
> cable for the outside run then when I ran out of that wire I bought
> another 30ft of indoor wire. Obviously the junction box where i am
> butt joining the wires is indoors. So basically I just need to know
> what size junction box I should be using.
>

I bet you could use a weather-proof circuit-breaker box -- like used for AC
disconnect. They're less than $10.00.



Posted by Colbyt on July 7, 2006, 11:44 am

>I am trying to figure out what size junction box I need to connect 6
> awg wire.
>
> I went to my local hardware store and the person there looked at me
> like I was an idiot, after talking to them for a min I realized they
> were the idiot...
>
> Anyways, the biggest box they showed me was a 4x2 1/8 square box, which
> I know is just too small. Not enough room to join a 3x6 awg wires.
>
> Basically I have hooked up my hot tub (which is outside) using armor
> cable for the outside run then when I ran out of that wire I bought
> another 30ft of indoor wire. Obviously the junction box where i am
> butt joining the wires is indoors. So basically I just need to know
> what size junction box I should be using.
>
> Mighty Miindy
>

You have 3 wires in and 3 wires out. That is a total of 6 wires. My book
is very out of date but it refers to NEC 370-6(b) which you might be able to
reference.

My book states that each #6 wire requires 5 cubic inches of space. You need
a box rated at 30 cubic inches. This site seems to confirm that
information:
http://www.tmsoftware.com/el96.htm#jbox

Just in case your math skills are rusty cubic inches is LxWxD.



--
Colbyt
One picture can be worth a 1000 words.
Post yours at www.ImageGenie.net for FREE.



Posted by on July 7, 2006, 11:57 am
On 7 Jul 2006 07:53:12 -0700, mighty.miindy@gmail.com wrote:

>I am trying to figure out what size junction box I need to connect 6
>awg wire.
>
>I went to my local hardware store and the person there looked at me
>like I was an idiot, after talking to them for a min I realized they
>were the idiot...
>
>Anyways, the biggest box they showed me was a 4x2 1/8 square box, which
>I know is just too small. Not enough room to join a 3x6 awg wires.
>
>Basically I have hooked up my hot tub (which is outside) using armor
>cable for the outside run then when I ran out of that wire I bought
>another 30ft of indoor wire. Obviously the junction box where i am
>butt joining the wires is indoors. So basically I just need to know
>what size junction box I should be using.
>
>Mighty Miindy


a 30 sq/in box will work for six #6s. That is a 4x4x2 1/8. They also
sell a 4 11/16 x 4 11/16 x 2 that will work.
What is wrong is using AC cable for the spa (outside). It should be
wire in pipe with an insulated ground.

Posted by on July 7, 2006, 12:12 pm
Why is using the AC wire outside wrong? I checked with the local codes
and they said it was fine. It is a weather proof plasic shield with an
armor ontop of that along with another plastic cover over the armor. I
took a piece of it to the place where I got my electrical permit and
they said it was fine...

Why do you say that it is wrong? I dont think I understand what you
mean by a insulated ground.


The 4x4 2 1/8 box that I do have just doesnt seem to hold everything
properly. By the time I butt join the cables the wire is extremly hard
to bend and leave any extra in the box. But then again that just may
be me being not strong enough to bend the wires, but still I would
rather have a bigger box and give me more room to bend the wires
specially after I butt join them and put the shrink sleave on the butt
ends.

Mighty Miindy

gfretwell@aol.com wrote:
> On 7 Jul 2006 07:53:12 -0700, mighty.miindy@gmail.com wrote:
>
> >I am trying to figure out what size junction box I need to connect 6
> >awg wire.
> >
> >I went to my local hardware store and the person there looked at me
> >like I was an idiot, after talking to them for a min I realized they
> >were the idiot...
> >
> >Anyways, the biggest box they showed me was a 4x2 1/8 square box, which
> >I know is just too small. Not enough room to join a 3x6 awg wires.
> >
> >Basically I have hooked up my hot tub (which is outside) using armor
> >cable for the outside run then when I ran out of that wire I bought
> >another 30ft of indoor wire. Obviously the junction box where i am
> >butt joining the wires is indoors. So basically I just need to know
> >what size junction box I should be using.
> >
> >Mighty Miindy
>
>
> a 30 sq/in box will work for six #6s. That is a 4x4x2 1/8. They also
> sell a 4 11/16 x 4 11/16 x 2 that will work.
> What is wrong is using AC cable for the spa (outside). It should be
> wire in pipe with an insulated ground.


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