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Old 11-16-2009, 09:46 AM   #1
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Grounding in round box


I've got a 1/2" thick, 4" diameter round box that has two 14/2 cables running into it. The box only has one grounding screw on it. The fixture being mounted to it has an 18awg ground wire that needs to tie in.

What is the best code compliant method of grounding this?



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Old 11-16-2009, 10:47 AM   #2
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Grounding in round box


Take one of the ground wires from a cable, wrap it around the screw and leave enough hanging to connect the other wires and use a wire nut.
You have another issue, the box is not big enough for the two 14/2 cables and the fixture wire.

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Old 11-16-2009, 10:58 AM   #3
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Grounding in round box


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Take one of the ground wires from a cable, wrap it around the screw and leave enough hanging to connect the other wires and use a wire nut.
You have another issue, the box is not big enough for the two 14/2 cables and the fixture wire.
I thought the point was to always have the ground continue throughout the circuit in the event someone removes the fixture when the circuit is live. I know that method will work and is commonly used but if someone undid that wirenut, everything after this box will not be grounded....

As for size, what box size is required?
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Old 11-16-2009, 11:10 AM   #4
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Grounding in round box


For 2 14/2 cables you need a box with a minimum of 10 cubic inches.
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Old 11-16-2009, 11:21 AM   #5
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Grounding in round box


How many cu in's for a single 14/2?
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Old 11-16-2009, 11:23 AM   #6
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Grounding in round box


6 cubic inches
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Old 11-16-2009, 11:33 AM   #7
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Grounding in round box


Ok, so the box I posted above is a 6 cu in box. With a single 14/2 and then the fixture wires, it's already too small. What good are these things? They're used everywhere for exterior lighting....
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Old 11-16-2009, 11:34 AM   #8
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Grounding in round box


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Ok, so the box I posted above is a 6 cu in box. With a single 14/2 and then the fixture wires, it's already too small. What good are these things? They're used everywhere for exterior lighting....
Because the fixture wires are not counted
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Old 11-16-2009, 11:36 AM   #9
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Grounding in round box


So with that being said, how much difference does it really make stuffing another 14/2 in there if we're not going to count fixture wires? A fixture with a sensor and multiple lights can have alot more wire on it than a 14/2.
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Old 11-16-2009, 11:52 AM   #10
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Grounding in round box


Trying to stuff another 14/2 violates code
It's legal to have fixture wire in there - which is almost always smaller gauge wire
It's enough of a PIA to get the one 14/2 in there
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Old 11-16-2009, 11:54 AM   #11
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Grounding in round box


What box would you recommend for this application(exterior mounting) or what would need to be added to this box?
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Old 11-16-2009, 12:13 PM   #12
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Grounding in round box


Just to throw this in the mix - Iberville states that these boxes are only good for 5 cu in! Where are you guys getting 6 cu in from?
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Old 11-16-2009, 01:15 PM   #13
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Grounding in round box


If I recall you are in Canada....possibly different box then what we have

Mine are stamped 6.0 cu inches
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Old 11-16-2009, 01:32 PM   #14
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You're starting to know me too well. Think I can get away with a box extension? They're rated for 5 cu in as well.
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Old 11-16-2009, 02:11 PM   #15
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Grounding in round box


Box extensions will work as far as I know
I don't know the codes in Canada

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