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Old 02-21-2012, 05:43 PM   #1
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Splicing in a crawlspace


When my house was built the electrician ran a short piece of #2 AL SE-R into the crawlspace from the main panel, on a 100amp breaker, and capped it off in a small steel junction box for the detached garage that was later built. Can I splice USE-2 into the SE-R in a bigger pvc junction box, inside the crawl space, to get power to the garage? Or would I have to splice outside the crawl space?

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Old 02-21-2012, 06:39 PM   #2
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Splicing in a crawlspace


As long as it's accesible when you are done and there are four wires connected to the main panel and where the junction box you should be fine. But you can only use it for 90 amps.

How do you plan to run it underground to the garage?

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Old 02-21-2012, 07:15 PM   #3
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Splicing in a crawlspace


If the piece is really short it would be cheaper to run a complete new run in conduit for the entire length. Cheaper than a junction box and all the stuff to splice it together.
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Old 02-21-2012, 07:54 PM   #4
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Splicing in a crawlspace


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As long as it's accesible when you are done and there are four wires connected to the main panel and where the junction box you should be fine. But you can only use it for 90 amps.

How do you plan to run it underground to the garage?
Run pvc from the box 24" down below grade and direct bury it to the garage. It would be accessible as there is an access panel(meaning ply wood with slip bolts) just below the main panel where the SE-R is. 90 amps based on the aluminum #2?

I am trying to avoid cutting out sheetrock and making a mess inside to run conduit to the main. It's worth the $ for a junction box if you ask my wife.
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Old 02-21-2012, 08:02 PM   #5
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Splicing in a crawlspace


Does that wire go directly out the bottom of the panel into the crawlspace?
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Old 02-21-2012, 08:02 PM   #6
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Does that wire go directly out the bottom of the panel into the crawlspace?
Sure does.
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Old 02-21-2012, 08:07 PM   #7
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Splicing in a crawlspace


As long as you can make it so an 1-1/4" piece of PVC with a male fitting can fit up there after removing the wire all you have to do is slide the pipe into the hole into the bottom of the panel remove more knockout if needed thread on a lock nut and pvc bushing and there you go. Use LB fittings to run the wire through.

A lesson I learned recently is push wire so it goes through the top of the LB not through the bottom.
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Old 02-21-2012, 08:24 PM   #8
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Splicing in a crawlspace


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As long as you can make it so an 1-1/4" piece of PVC with a male fitting can fit up there after removing the wire all you have to do is slide the pipe into the hole into the bottom of the panel remove more knockout if needed thread on a lock nut and pvc bushing and there you go. Use LB fittings to run the wire through.

A lesson I learned recently is push wire so it goes through the top of the LB not through the bottom.
1 1/4" with a fitting is questionable and it's hard to tell if the hole that the wire is coming through is directly below the same knockout it is currently going through.

1 1/4" with 2-2-2-4? is that really possible??? Seems tight.
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Old 02-21-2012, 08:29 PM   #9
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Splicing in a crawlspace


The conduit fill chart that I am looking at says 1-1/4" schedule 40 5 x #2 wires will work. So you are under the fill. looking at the bottom of the breaker panel may be able to see through an open space.

Is the wire 4 wire?
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Old 02-21-2012, 08:50 PM   #10
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The conduit fill chart that I am looking at says 1-1/4" schedule 40 5 x #2 wires will work. So you are under the fill. looking at the bottom of the breaker panel may be able to see through an open space.

Is the wire 4 wire?
Yes, 3 x #2 conductors and a an uninsulated #4 ground all aluminum. Cable says SE Type R. Can't really see, maybe with light at the hole.
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Old 02-21-2012, 08:54 PM   #11
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Splicing in a crawlspace


I would not weigh out the idea of splicing price the supplies either way and go from there use schedule 80 where the pipe could get hit with something.
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Old 02-21-2012, 08:56 PM   #12
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Splicing in a crawlspace


How big of a junction box anyways, 12" x 12"? Isn't it conduit trade size x's 6 or 8 depending on straight or angle pull for splice boxes?
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Old 02-21-2012, 08:57 PM   #13
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Splicing in a crawlspace


I picked up my permit today, so does splicing sound up to code?
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Old 02-21-2012, 08:59 PM   #14
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Splicing in a crawlspace


10x10 sounds good but 12x12 would allow you more room making it easier to play around in the crawl space. I would ask the inspector if the code enforcement office what they think about splicing. They have final say.
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Old 02-21-2012, 09:23 PM   #15
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Splicing in a crawlspace


I will shoot a light up through to see if a solid piece in conduit may work, but can the USE-2 be inside the walls anyways?

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