Wire Heating


  #1  
Old 06-24-04, 04:31 PM
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Question Wire Heating

This will be a double question. I am going to add a light in a hallway and was going to tie it into a junction box. this would put one wire in snd four wires out. I was reading something about overheating with too many wires? Secondly, while looking for this info, I ran into an overheating issue about romex in conduit which I had done with advise from local hardware store. Any problems with either? Thanks.
 
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Old 06-24-04, 07:18 PM
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First the box fill question. You say one wire in and four wires out. Do you mean one cable in and four cables out. To determine if this would be a problem or not, we need more information. First is the gauge of the wire. Is it 14 or 12? Then the types of cable. Are they black/white/bare, or black/red/white/bare? They the type of box. Is it metal or plastic? Then the size of the box. There is a cubic inch number on the back of the box if you can read it. Otherwise, just measure the height, width and depth. Finally, what devices, if any, are in the box? Duplex receptacle(s)? Switch(es)?

Now the cable issue. What kind of cable? 12/2? 12/3? 14/2? 14/3? How many cables? What size conduit: 1/2", 3/4"? What type conduit: EMT? Schedule 40 PVC? Schedule 80 PVC? And how long of a conduit run? 10 feet, 20 feet, 100 feet? And finally, where is the conduit? underground? in the wall? in the attic?

The answers to your questions depend on all this detail.
 
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Old 06-24-04, 07:28 PM
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Sorry for the lack of info. The box is just a metal junction box 4 x 1 1/4 with 12 gauge wire and no devices. The second part is a 10 foot stretch of 1/2 inch gray electric conduit according to hardware store with 12/2 running along the house from the crawl space to an outside shed. Thanks again for your help.
 
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Old 06-24-04, 07:42 PM
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Still need the rest of the information requested in my prior post.
 
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Old 06-24-04, 08:15 PM
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Trying to answer all the questions. The box has 12 gauge wire with blck/white/bare with one hot in and four going out. The conduit part is one cable only. Hope this answers all the questions and again I apologize for the inconvenience.
 
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Old 06-24-04, 08:29 PM
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So are you saying that there are four 12-gauge black wires, four 12-gauge white wires and four 12-gauge bare wires? Nothing else? And you are proposing adding one more 12-gauge black wire, one more 12-gauge white wire, and one more 12-gauge bare wire? Is this all correct?
 
  #7  
Old 06-27-04, 04:31 PM
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Yes that is the situation. I had just heard somehting about overheating of wires.
 
 

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