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Old 12-17-2011, 12:08 PM   #1
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Box fill - Reliable calculators?


The various exceptions and writing of the NEC have me a bit tripped up on this.

Are there any ONLINE box fill calculator that someone cant point me to that are reliable/accurate?

The numbers I'm getting dont seem to match anything.


I have a 3 gang box with:
2 x 12/2 (4 x 2.25)
3 x 14/2 (6 x 2.00)
3 devices - 2 conductors each, so is it (6 x 2.25) or (4 x 2.25 + 2 x 2.00)?
internal clamps (2.25)
Largest ground (2.25)

So I've got: 9 + 12 + 13.5 + 2 + 2.25 = 39.00

http://www.constructionmonkey.com/ca...l/boxfill.aspx
Gives me 32.30

Where am I going wrong?

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Last edited by fuzzball03; 12-17-2011 at 12:19 PM.
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Old 12-17-2011, 12:40 PM   #2
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Box fill - Reliable calculators?


I come up with 39.
The online calculator missed the ground wire, and missed on the # of devices.

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Old 12-17-2011, 12:49 PM   #3
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Box fill - Reliable calculators?


It's not you. The calculator is only counting the devices as a single conductor.

I have a 3 gang box with:
2 x 12/2 (4 x 2.25)
3 x 14/2 (6 x 2.00)
3 devices - 2 conductors each (4 x 2.25 + 2 x 2.00) largest conductor connected to the device.
internal clamps (2.25)
Largest ground (2.25)

Should read: 9 + 12 + 13 + 2.25 + 2.25 = 38.5

Last edited by AandPDan; 12-17-2011 at 12:53 PM. Reason: math error - figures!
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Old 12-17-2011, 04:22 PM   #4
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Box fill - Reliable calculators?


Great. thanks guys
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