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Old 02-15-2018, 08:31 PM   #1
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Pex


Two part question, if I can get any guidance:

1) Can PEX be used as both electrical wiring and plumbing?

2) Is PEX compatible with both metal studs and wood studs? Are there any potential issues with either?
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Old 02-15-2018, 08:54 PM   #2
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Re: Pex


1. No. Water only.
2. With metal studs, I'm sure you need to install grommets.

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Old 02-15-2018, 08:57 PM   #3
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Re: Pex


Pex is a poor conductor of electricity, but a good conductor of water.
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Old 02-15-2018, 09:20 PM   #4
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Re: Pex


Maybe he was asking if it could be used as conduit?


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Old 02-15-2018, 09:24 PM   #5
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Re: Pex


Probably. Funny thing is, why not? How's it differ from PVC? Flexible, no joints to catch when pulling wire. One spool for P and E contractors.
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Old 02-15-2018, 09:24 PM   #6
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Re: Pex


Quote:
Originally Posted by Mordekyle View Post
Maybe he was asking if it could be used as conduit?


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That’s all I could think of too.

I would not use pex for conduit. I’d use conduit for conduit.
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Old 02-15-2018, 09:38 PM   #7
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Re: Pex


Quote:
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Probably. Funny thing is, why not? How's it differ from PVC? Flexible, no joints to catch when pulling wire. One spool for P and E contractors.
It's not UL listed for the use.

Also, flex raceways have a habit of exceeding the 360° of bends rule.
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Old 02-15-2018, 09:49 PM   #8
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Re: Pex


Quote:
Originally Posted by 480sparky View Post
It's not UL listed for the use.

Also, flex raceways have a habit of exceeding the 360° of bends rule.
I guess my question is more what's the inherent property of PEX that's preventing it from getting UL listed? The bends rule makes some sense though.

I will say it was standard practice in the sub arctic of Fairbanks Alaska to run Raychem self regulating heat trace through a run of Pex tied to the well line and other plumbing lines that were at risk of freezing. Easy to bend along with the line, good for higher temps, and possible to pull and replace the heat line deep under ground.
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Old 02-16-2018, 12:28 AM   #9
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Re: Pex


Apparently Article 353 of the N.E.C. covers HDPE non-metallic conduit.
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Old 02-16-2018, 12:32 AM   #10
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Re: Pex


H.D.P.E. Non-metallic conduit:

3.21.353.12. Uses Not Permitted.
It must not be used above 50°C, either by reason of a high ambient temperature, or high operating temperatures of the enclosed conductors, or both. Polyethylene is flammable, and for that reason it is generally limited to direct burial applications. If not specifically prohibited, it is permitted above grade if encased in a concrete envelope not less than 50 mm (2 in.) thick. It is not permitted to be exposed, and it must not be used inside buildings.
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Old 02-16-2018, 12:42 AM   #11
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Re: Pex


Looks like PVC has a much, much higher dielectric strength than HDPE for a given thickness, though I could be wrong.
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Old 02-16-2018, 03:06 PM   #12
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Re: Pex


Imagine working in a mechanical room that only had Pex for all the utilities.....oops I thought I was cutting the DWV pipe and just sawed into a 200 Ampere 4 wire service cable conduit........


I want a drinking water straw / UBS cable for my not-so-Smart phone.
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Old 02-18-2018, 08:11 AM   #13
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Re: Pex


Thanks for all your feedback! If I am understanding correctly, the PEX is not the best option here for both plumbing/electrical.


If I go with metal studs and aluminum (for both wiring and piping), is this an issue, is galvanic corrosion?
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Old 02-18-2018, 08:41 AM   #14
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Re: Pex


I gotta ask: WHY?
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Old 02-18-2018, 08:47 AM   #15
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Re: Pex


Aluminum piping? Aluminum wire?
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Old 02-18-2018, 09:06 AM   #16
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Re: Pex


I expect a big RED "thread closed" label any minute now...
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Old 02-19-2018, 11:13 AM   #17
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Re: Pex


Quote:
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Aluminum piping? Aluminum wire?
both bad ideas.
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Old 02-19-2018, 11:14 AM   #18
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Re: Pex


Now you know where the Wall of Shame stuff comes from.
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Old 02-19-2018, 07:34 PM   #19
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Re: Pex


This sounds like one of those jobs that got grossly underbid and now every corner imaginable will be cut to save money

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