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Old 01-02-2012, 04:43 PM   #1
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Generator Cable Run


Ran the cable for my generator today. I bought 25 feet of orange 10/3 cable. Well, it wasn't enough. I had about 20 more feet of 10/3 from a hot water installation ( white, type NM ).

I *CAN* splice this together right? If so, what size junction box do I need ( just two 10/3 cables with ground ). The splice will be about 10 feet from my main electric panel, so nice and dry and readily accessible.

I'm in NH If it makes any diff. I will call my building inspector tomorrow too to see if he has any issues with it.


Last edited by dougp23; 01-02-2012 at 05:23 PM.
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Old 01-02-2012, 04:50 PM   #2
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Do you have 10-3 with ground for both cables? Normally a water heater is connected with 10-2 with ground.

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Old 01-02-2012, 05:18 PM   #3
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Generator Cable Run


Nope it's 10/3. I think the HW heater was 240v.
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Old 01-02-2012, 05:20 PM   #4
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Originally Posted by dougp23 View Post
Nope it's 10/3. I think the HW heater was 240v.
And a water heater is usually wired with 10/2 since it is straight 240v.

Brric was just confirming.

You need a deep 4' sq box.
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Old 01-02-2012, 05:25 PM   #5
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Generator Cable Run


Thanks brric and Speedy! I did not know that about a straight 240 needing just two conductors. How is it diff from a 240v dryer, which is usually 10/3? I am just curious, maybe the install I pulled the HW cable from was done wrong....
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Old 01-02-2012, 05:30 PM   #6
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Generator Cable Run


might consider a fused disconnet so you get the connection... the weather tight box...and fusing all in one or just copper bug the lines rubberized tape and electrical even those plastic clam shells to seal each wire....
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Old 01-02-2012, 06:31 PM   #7
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Originally Posted by dougp23 View Post
Thanks brric and Speedy! I did not know that about a straight 240 needing just two conductors. How is it diff from a 240v dryer, which is usually 10/3? I am just curious, maybe the install I pulled the HW cable from was done wrong....
Straight 240 does not need a neutral, so 10/3 is fine, but wasteful since a wire is left unused.

An electric dryer, or (usually) an electric stove, are actually 120/240. The heating elements work at 240V, but the timer, motor, and other controls use 120V. Thus, those appliances require the neutral to get 120V.

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