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 DIY Chatroom Home Improvement Forum Calculating fill volume question
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08-21-2011, 01:25 PM   #1
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## Calculating fill volume question

I Have a round fixture box for a vanity light shown below. I will have three 12/2 wires coming into the box, no ground clamps as I am using wire nuts. The box is plastic so no wire clamps. How can I calculate the fill volume for the fixture. My box has 20 cu in capacity.

3 wires= 6 conductors
Ground = 1 conductor
Fixture conductor equivalent ???

Total x 2.25= cu in needed

Am I right with the rest of the equation?

08-21-2011, 01:30 PM   #2
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Total volume required is 15.75 cu in, so the 20 cu in box is fine.
The fixture wires do not get counted

 08-21-2011, 01:37 PM #3 Member   Join Date: Aug 2011 Posts: 108 Rewards Points: 75 Good news. How did you determine the fixture volume?

08-21-2011, 01:38 PM   #4
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Quote:
 Originally Posted by toobhed Good news. How did you determine the fixture volume?
Or do you? Does the fixture itself count? Buckles or yoke or whatever?

 08-21-2011, 06:31 PM #5 Lic Elect/Inspector/CPO   Join Date: Apr 2011 Location: NJ Posts: 369 Rewards Points: 250 fixture volume is not counted

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