Re: [DIY] Table 314.16(A)

 

Perhaps this link will answer your question.  http://www.ecmweb.com/code-basics/box-fill-calculations

Flat_Land Dale

Ron Johnson l0c0l0b0@hotmail.com [DoIt_Yourself] wrote:

 

Have a situation and a question.  I am rewiring a house and the owner wants 3-way switches for her ceiling lights PLUS a switch for the fan.  No problem with the wiring though it's not what I usually do so I have to study the situation.  This means that a lot of wires are being sent into a J-Box, some 12ga some 14. Here in this place we are limited to only use 14ga for lights up to 200 watts.

The question is: What is the reason for the limitations on table 314.16 (A) of the NEC? 

Is it only to make sure that there is not overcrowding? I always tape my wirenuts on, so they would stay on and not get knocked off. 

Does it have to do with heat or magnetism created by current in the wires? I wouldn't think a lot of either is created.

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Posted by: Dale Schoepflin <dalu@hbcomm.net>

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