Water Proof Box on Unfinished Garage

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  #1  
Old 11-15-15, 07:29 AM
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Water Proof Box on Unfinished Garage

I want to use a motion detector to trip a relay to several adfitional spots so need to run 4 THHN into the WP from inside the to be finished later garage wall/stud bay. The 4th wire is a hot from the relay back to the two spots. I've learned to be cautious with the amps through the motion detector and don't want the relay to over burden the motion detector if it was also powering the two spots.
1. Is there any way to clamp THHN inside the WP box? Does it need to be clamped any placed?
2. What can be attached to the nipple as a 90 degree pull? If a rigid pull, will emt or BX connect to the other side? Or do I need to use a metal box as a transition ?

TIA

Ron
 
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Old 11-15-15, 08:04 AM
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THHN must run through conduit, so using a pull fitting would be proper. No need to clamp it further. I don't really understand the problems with running conduit into a pull fitting to the side of the box. Maybe you could elaborate a little.
 
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Old 11-15-15, 08:26 AM
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If a pull L or LB is used it must be accessible. Also the cover is removed to pull the conductors into the conduit.
 
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Old 11-15-15, 09:53 AM
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PCBoss - Thanks.
Chandler - Thanks for the information on clamping. The nipple is on the back of the box going into the wall/stud bay, not the side so the issue becomes accessibility as PCBoss pointed out. I don't think there is any kind of a 90 or junction I can put on the nipple that doesn't have a cover that will require access. Maybe I should just run emt or PVC conduit up and through the soffit. Or I suppose I could build a cubby with a door. It's the garage so not a huge deal and it would be just below the top plates.

I've about decided the easiest way to do this is to put an insulating bushing on the end of the nipple, run two NM into the box and use the hot in the second NM back to the spots. Staple off both in the stud bay and be done with it.

Bust . . . now I'm wondering if I'm putting too many connectors in the box . . . 4"X 1-1/2" round with 12 guage and lets see if I'm doing this right??
1. Hot to sensor = 2
2. Neutral to sensor and two lights. = 4
3. Sensor to runner = 2
4. 2nd hot to two lights = 3
Arggg 11 total. Looks like I need a 4" X 1-1/2" square.

Did I get the count correct?

Again, thanks for sharing your time and skills.
 
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Old 11-15-15, 04:42 PM
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As PCboss mentioned, it must be accessible to use LB or pulls. Why not just use a sweep. I don't understand your wire count method. Clarify it, please. Why are you using so many box connectors? Or you misusing the term "connectors" for "conductors"?
 
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Old 11-15-15, 05:28 PM
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Did you consider a xx-3 cable?
 
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Old 11-15-15, 06:13 PM
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I'm sure I'm 100% screwed up as I didn't catch there are two terms. Sight reading too fast
Electrical Box Fill Calculations - Construction Monkey

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1. Hot to motion detector
2. Neutral
3. Runner out
4. Hot in to lights.

And grounds don't count. Do I have it right this time?

TKS.
 
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Old 11-15-15, 06:25 PM
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Yes, but with needing less than 3' didn't think it would make the Good/Quick/Cheap equation balance. Plenty of room to simply run a second NM.

R
 
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Old 11-15-15, 09:00 PM
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All grounds count as one towards box fill.
 
  #10  
Old 11-17-15, 04:59 PM
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Thanks! 5=10 cubic", so the round box is good. Micky Mouse is not my friend.
 
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