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Understand Wire Capacity and Extension Rings

0:33
1:38
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At 0:33 in

Master Electrician Dad Quizzes Apprentice Son on Commercial Materials, this correct? #hendythesparky

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What happens here

The discussion shifts to wire capacity within electrical boxes. The electrician explains that the maximum number of wires is not given directly but is determined by the 'cubic inch rating' which is 'stamped on' the box. He introduces an 'extension ring' as a solution if more capacity is needed, as it also 'has a cubic inch rating' that adds to the total volume available for conductors.

Goal: Learn how to determine wire capacity and use extension rings to increase it.

Tools and materials

  • Electrical Box RACO — The container for electrical wiring
  • Extension Ring — To increase the volume/wire capacity of an electrical box

What they say

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can barely get any wires in that. How many wires maximum can go in that? Well, it'll tell you the cubic inch. You can always add an extension ring. It doesn't tell you how many wires you can put in here because you could put all different kinds of size wires, but it'll give you a cubic inch rating. It's stamped on there. You think you're going to exceed it. You could use an extension ring. And then it was this also has a cubic in rating. So the combination of both is how many conductors you can put in here. >> Wow, that's a lot of math. >> It is. Thanks, Ed.

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