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Additional box volume? #77932 07/22/01 10:47 AM
Joined: Mar 2001
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Redsy Offline OP
Member
When using a 1/2" deep pancake box, with a volume of 8", this volume is considered with a cover on the box, correct? If using one to install a ceiling fan, or any other fixture that does not have a plate that sits right on the fixture, is additional volume provided by the fixture?
I dont' think 370-16(a) applies because fixtures are not marked with volumes, but I'm also looking at 410-10.

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Re: Additional box volume? #77933 07/22/01 11:39 AM
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sparky66wv Offline
Member
Wow...

Yes, I was under the assumption that one could count the escutcheon (canopy) as part of the wire fill area, but 370-16(a) clearly states "...that are marked with their volume in cubic inches..." Could this mean that even if they marked the volume, but used the metric system (which the code uses at times and will next year) then it cannot be used?


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Re: Additional box volume? #77934 07/22/01 03:25 PM
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sparky Offline
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Redsy,
good one. my code book is dogeared from Q's like this! Once again,years of assumption falls flat on it's face.... There must be some recourse for the lowly pancake box???

[Linked Image]

Re: Additional box volume? #77935 07/22/01 08:55 PM
Joined: Dec 2000
Posts: 4,283
electure Offline
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Virgil's found yet another hole in the wording of the Code! It's looking more and more like Swiss Cheese. Given 3 years to think & discuss, you'd think the CMP's would fill more of the gaps!

Re: Additional box volume? #77936 07/23/01 01:43 AM
Joined: Oct 2000
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Bill Addiss Offline
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Just my opinion,

I think that you can't technically count the canopy space when figuring the box fill for your conductors. The canopy does however absorb the fixture wires (they're already there, right?) so that they do not have to be added into the box fill.
sound reasonable? [Linked Image]

Bill


Bill

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