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Old 08-18-2012, 11:25 PM   #1
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Knockout in panel.. Any NEC section?


Hi folks,
I'm running a 1 1/4" PVC to my subpanel which is recessed into the wall. Coming into the panel from the bottom, I see two large knockouts, one is in the center and ther other is closer to the side of the panel. I'd like to use the one in the center so I can drill through an ideal spot in the sill and run my pipe straight down. I don't want to use an offset if it is not necessary.

But, the knockout in the center looks to be for a larger diameter like 1 1/2" to 3". The knockout closer to the side, the one I don't want to use, looks like 3/4" to 1 1/2". These are multi size knockouts.

I can get a male adapter in 1 1/2" and use a reducing fitting to accommodate the 1 1/4" pipe which will fit the center knockout. I can't find anything in the 2008 NEC that covers anything about knockouts. So, I think this would be code compliant, because it will be inspected.

Can someone ease my concern?
Thanks for the help.
Rick


Last edited by RM575; 08-19-2012 at 01:02 PM.
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Old 08-18-2012, 11:29 PM   #2
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Knockout in panel.. Any NEC section?


Your plan will work.

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Old 08-18-2012, 11:54 PM   #3
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Knockout in panel.. Any NEC section?


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Your plan will work.

Thanks Joe,
I think so too. Hope the city inspector does as well.
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Old 08-19-2012, 04:46 AM   #4
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Knockout in panel.. Any NEC section?


If you're using 1 1/4" pipe, just get a 1 1/4" TA and use 2- 1 1/2 X 1 1/4 reducing washers.
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Old 08-19-2012, 07:23 AM   #5
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Knockout in panel.. Any NEC section?


Quote:
Originally Posted by RM575 View Post
Hi folks,
I can get a male adapter in 1 1/2" and use a reducing fitting to accommodate the 1 1/4" pipe which will fit the center knockout. I can't find anything in the 2008 NEC that covers anything about knockouts. So, I think this would be code compliant, because it will be inspected.

Can someone ease my concern?
Thanks for the help.
Rick
You can do what you want which is this I assume?
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Old 08-19-2012, 07:26 AM   #6
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Knockout in panel.. Any NEC section?


or like wirenut said just use a reducing washer on the 1.5 knockout
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Old 08-19-2012, 07:42 AM   #7
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Knockout in panel.. Any NEC section?


I would bet money there is a 1 1/4" KO in the bottom of the sub panel and he is just mistaken about the size. I can't say that I've ever seen a 3" KO in a residential panel.
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Last edited by k_buz; 08-19-2012 at 08:01 AM.
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Old 08-19-2012, 12:22 PM   #8
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Knockout in panel.. Any NEC section?


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I would bet money there is a 1 1/4" KO in the bottom of the sub panel and he is just mistaken about the size.
The possibility is likely.
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Old 08-19-2012, 12:49 PM   #9
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Knockout in panel.. Any NEC section?


Thanks for the replies. I like the option of the reducing washer. I've used those before and don't know why I didn't think of that. I guess I'm a little nervous about building inspectors reviewing my work.

The panel has a 1 1/4" knockout in a spot where it would require me to use an offset to send my pipe through the sill plate at the right spot. The larger set of knockouts are perfectly positioned for a straight pipe run and that is where I'll need the reducing washer.

I measured the largest knockout on my panel with a tape measurer and it is exactly 3" in diameter, which doesn't mean a 3" pipe, but more likely a 2" with a reducing washer.

I really appreciate your help, thanks again.

Last edited by RM575; 08-19-2012 at 01:06 PM.
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Old 08-19-2012, 01:06 PM   #10
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Knockout in panel.. Any NEC section?


time to get to knockin out

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