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Old 09-04-2013, 10:28 PM   #1
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I just finished installing an outlet for my dryer using 1/2 in. pvc conduit running on the outside of the house to my panel. one joint between a 90 deg. bend and a length of pipe is broken. the pvc cement I bought at Lowe's which is supposed to be for pvc conduit seems to be weaker'n h***, NEVER had pvc joints break before using regular pvc cement.
my question is: how important is it to keep those wires inside the conduit dry? (THNN no. 10) I'm thinking,the stress put on the coduit during the "pull" must've been enough to break it. that cement is "crapola"!

tnx,

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Old 09-05-2013, 12:10 AM   #2
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Did you use primer before you used the cement?

There are also different cements for different PVC's....

I'm assuming you used the gray conduit? The cement is clear...and the primer is purple....

As for the wires....the only time I use 1/2" PVC is only if it's 3 12g wires.....anything larger and I upsize the conduit. Your fine on the size....but as you have seen....it can be difficult to pull wire through.

Look at your wires....chances are they are THHN/THWN....the THWN means it's ok for wet locations. If in fact they are just THHN....then you want to avoid getting them wet...(at least that is what the sparky's will tell you...personally, unless it's going to be under water...THHN is fine)

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Old 09-05-2013, 01:55 AM   #3
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Single rated THHN in an outdoor conduit exposed to weather (wet location) would be a code violation.
THHN is a dry or damp rating.

You need the THWN or one of the other wet ratings to meet code.
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Old 09-05-2013, 02:38 AM   #4
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Not enough straps.
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Old 09-05-2013, 07:29 AM   #5
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Too small PVC.
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Old 09-05-2013, 07:35 AM   #6
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I'll play...


Not enough glue
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Old 09-05-2013, 07:54 AM   #7
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I'll play...


Not enough glue
My thought too. Personally have never had a problem with any sort of pvc joint coming apart.
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Old 09-05-2013, 02:30 PM   #8
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firstly I used enough cement that I was afraid of causing an obstruction in the pipe. second,thnn stranded is all HD sells. third the cement is gray with no mention on the can of using primer. (I DO use primer on regular pvc that's going to be under pressure though) and fourth,since I'll be painting the pvc to match the stucco, that paint SHOULD keep moisture out. (I hope)

tnx,

ps: 1/2 in. conduit is supposed to take 5 no. 10 wires,I only had 4 so you'd think I'd be ok. that wasn't the case,the "pull" was a nightmare. I'll go with 3/4 in the future.
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Old 09-05-2013, 02:43 PM   #9
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I would have a second look at that wire. Last time I bought THHN from HD, it was marked THHN/THWN.

As for wire pulls....you now understand....what is legal for conduit fill does not really reflect real world use.....when I'm spec'ing conduit....I upsize if there is any doubt....the only time I use just 1/2" is if there are only 4 or less #12's....anything bigger gets upsized.
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Old 09-05-2013, 03:01 PM   #10
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Quote:
Originally Posted by ddawg16 View Post
I would have a second look at that wire. Last time I bought THHN from HD, it was marked THHN/THWN.

As for wire pulls....you now understand....what is legal for conduit fill does not really reflect real world use.....when I'm spec'ing conduit....I upsize if there is any doubt....the only time I use just 1/2" is if there are only 4 or less #12's....anything bigger gets upsized.
IMO, especially with pvc.
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Old 09-05-2013, 07:28 PM   #11
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DDawg16 nailed it. I read the wire which I should have done before and it says thnn or thwn.

tnx,
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Old 09-05-2013, 07:35 PM   #12
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Pretty much universally, if you buy THHN today it will be dual rated THWN. It is getting tiring reading all the replies throwing red flags about this. In toady's world this is REALLY a non-issue.
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Old 09-05-2013, 07:55 PM   #13
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The conduit may have needed an expansion fitting.
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Old 09-05-2013, 11:14 PM   #14
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Quote:
Originally Posted by ddawg16 View Post
Did you use primer before you used the cement?

There are also different cements for different PVC's....

I'm assuming you used the gray conduit? The cement is clear...and the primer is purple....

As for the wires....the only time I use 1/2" PVC is only if it's 3 12g wires.....anything larger and I upsize the conduit. Your fine on the size....but as you have seen....it can be difficult to pull wire through.

Look at your wires....chances are they are THHN/THWN....the THWN means it's ok for wet locations. If in fact they are just THHN....then you want to avoid getting them wet...(at least that is what the sparky's will tell you...personally, unless it's going to be under water...THHN is fine)
Purple primer is for underground plumbing work so inspectors can see it,if youre using primer use the clear stuff in yellow can.

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