Junction Box vs. Collared Nipple

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linespike

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I am running two 12/2 UF cables from inside one outbuilding to two small outbuildings. The cable will enter the main outbuilding through a 1/2" pvc LB connector and conduit outside.

Question: Do I need a junction box, OR can I just have a collared nipple on the inside of the wall for the cable to pass through to the main panel? :confused:

Thank you in advance and Seasons Greetings,
Richard Linespike
 
Re: Junction Box vs. Collared Nipple

Assuming this is a residential property, why are you installing a panelboard?

I see no reason for a junction box if the UF cable is listed with 90?C wire. It may be run the same as NM cable [340.10(4)]. :D
 
Re: Junction Box vs. Collared Nipple

Main panel is in the main outbuilding supplying the branch circuit I assume. No matter though, I see no reason for a JB either. You are just sleeving the UF for protection out of the building and down into the ground. You are not running conduit between the buildings, right? Direct buried UF?

Edit to add:

Hmmm, I just reread your question, another point- the LB doesn't go directly into the back of the panel does it? If it does you will need a weatherproof "squeeze" connector at the end of the PVC in the ground where the UF exits, assuming of course that this is not a continuous conduit run between the buildings as I mentioned above. Then you should use THWN instead of UF.

-Hal

[ December 29, 2004, 07:11 PM: Message edited by: hbiss ]
 
Re: Junction Box vs. Collared Nipple

without looking it up, you can't energize a panel with two seperate runs of cable, as you are doing.

if you were only using the conduit and lb+fitting (chase nipple) to protect the wire as it emerges from the ground, and each uf was a seperate circuit, energizing different locations or uses, then it is okay.

paul
 
Re: Junction Box vs. Collared Nipple

Clarification on previous post:

The main outbuilding has a 100 amp. panel and will be supplying power to two small sheds. Each has a continuous run of 12/2 UF buried cable, and its own outlet for a light. The conduit is just to protect the wire where it exits the building. LB will just enter the main building through the siding but not the panel.

Question:

A) Can I put both small sheds on the same circuit breaker?
B) Chase nipple is all that's needed to enter the main building from the LB outside?


Thank you gents for your input, :)

Linespike
 
Re: Junction Box vs. Collared Nipple

Originally posted by hbiss:
the LB doesn't go directly into the back of the panel does it? If it does you will need a weatherproof "squeeze" connector at the end of the PVC in the ground where the UF exits...
Click to expand...
Hal, could you explain this?

A) Can I put both small sheds on the same circuit breaker?
Click to expand...
If your breaker is listed for having two wires under the terminal, otherwise pigtail them together and put one wire under the screw in the breaker.

B) Chase nipple is all that's needed to enter the main building from the LB outside?
Click to expand...
My pat answer to this would be yes, but I could be technically wrong.
 
Re: Junction Box vs. Collared Nipple

quote:
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B) Chase nipple is all that's needed to enter the main building from the LB outside?
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If you meant to enter the main building panel. No you would be required to use a cable connector. See 312.5 C or 314.17 B cable must be secured to.
 
Re: Junction Box vs. Collared Nipple

What I was saying is that if the LB goes through the siding and into a panel KO (back of panel is right on other side of the wall) the UF is not considered sleeved by the PVC, it's in a raceway. In this case you must provide a suitable connector where the UF leaves the PVC. Since they don't make duplex squeeze connectors you are going to have to do two runs of conduit up into the building.

Not sure if two pieces of 12/2 UF will fit into 1/2" either. I would suggest 3/4". Why kill yourself for a few pennies?

Can I put both small sheds on the same circuit breaker?

If all this is supplying is one outlet in each shed I don't see why not.

Chase nipple is all that's needed to enter the main building from the LB outside?

Assuming that you are just sleeving the UF, I have never used a chase nipple for this. Just drill a hole for the LB "hub" and put some duct seal or caulking around it. Your straps on the PVC will hold it in place.

Since both runs will be on the same circuit you can run both into the panel and wire nut them together inside or use a J box with one run to the panel. Whichever is easier.

-Hal
 
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