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Old 02-02-2012, 04:30 AM   #1
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Routing pvc conduit through drywall near panel


I need to install a NEMA 6-50 receptacle about 20 feet away from my main breaker panel in my garage. I would like to surface mount 3/4" pvc at the top of the wall and then down to the receptacle. I'm not sure how to cleanly get the pvc from the panel box (behind the drywall) out to where I can surface mount the run. Should I install some sort of box at the ceiling over the panel and run the pvc into the back of that box and then out the side?

Just to double-check my other calculations, the 6-50 config is H-H-G so I'm using THHN 90C rated. AWG 6 from NEC Table 310.16 says ampacity of 75 and since I only have 2 conductors in the cable I don't think I need to derate for fill. Since the plug is for a kiln, even though it's 18 inches from the kiln the temperature could reach 140F (60C) so I derate at .71 to get ampacity 53 amps. Using a 50 amp breaker and AWG 6 THHN should cover me.

I got my permit from the city today so I want to make sure it's done by the book. Thanks in advance for any tips.

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Old 02-02-2012, 07:24 AM   #2
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Routing pvc conduit through drywall near panel


From the panel to the box, drop a piece of 6/2.
Make your connections inside the box to the thwn wire, onto the receptacle.

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Old 02-02-2012, 07:52 AM   #3
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Routing pvc conduit through drywall near panel


If your set on using pvc, you can do a pvc changeover to liquidtite into the panel, or you can run romex/mc from the panel and set a box at the top then run pvc from there
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Old 02-02-2012, 03:40 PM   #4
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Routing pvc conduit through drywall near panel


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From the panel to the box, drop a piece of 6/2.
Make your connections inside the box to the thwn wire, onto the receptacle.
Thanks for the help. The receptacle will be about 20 feet down the wall from the panel. Are you saying use 6/2 from the panel to a box and then conduit down to the receptacle box?
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Old 02-02-2012, 03:46 PM   #5
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Routing pvc conduit through drywall near panel


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If your set on using pvc, you can do a pvc changeover to liquidtite into the panel, or you can run romex/mc from the panel and set a box at the top then run pvc from there
Thanks. I'm not set on pvc inside the wall and Romex would work fine there I think. Wouldn't I need a splice at the box above the panel then? Or I suppose I could run romex inside conduit but I think that negatively affects the ampacity and is harder to run. I'd rather not splice since it's just 20 feet and I can run from breaker to receptacle all in pvc.

If I had not suggested the pvc at all, what would be the 'standard' or best way to do something like this? If I run Romex through the walls all the way and come out behind the box, then don't I need to open a lot of drywall to tack things down? The pvc just seemed easier to install and inspect.
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Old 02-02-2012, 05:11 PM   #6
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Routing pvc conduit through drywall near panel


Do you have an attic above the garage you could run the wire through then drop back down through the wall?
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Old 02-02-2012, 06:58 PM   #7
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Routing pvc conduit through drywall near panel


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Do you have an attic above the garage you could run the wire through then drop back down through the wall?
There is an attic space above the garage where I could run NM-B. I could staple the cable to the joists in that area. Is it legal to run loose cable down the inside of the wall into the back of a junction box for the NEMA 6-50 receptacle or do I need to open the wall and tack it down periodically?
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Old 02-02-2012, 08:31 PM   #8
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Routing pvc conduit through drywall near panel


You can run it loose inside the wall.

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