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Old 10-28-2009, 03:44 PM   #1
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Junction Boxes & Splicing Romex


Hi. I would like to put in a stairway between a utility room in my house and the space above my garage which is adjacent to the utility room but 4 feet higher as it is a split level house design. The new doorway will have 10 romex wires running across the middle of the doorway.
I would like to splice these wires with junction boxes to run around the door frame.
How many wires (12/2) can I put in each junction box? What size box should I use? Is blue plastic okay? These boxes will be accessible in the attic space.
Thank you all very much for your input.

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Old 10-28-2009, 05:28 PM   #2
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Junction Boxes & Splicing Romex


That depends on how big the junction box is. Are all of the conductors #12? You have to allow 2.25 cu in for each #12 and 2.00 cu in for each #14. Plastic is fine. A lot of the plastic boxes have the cu in size stamped on them. I would get a large junction box with room for expansion.

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Last edited by teamo; 10-28-2009 at 05:35 PM.
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