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#99791 - 09/10/06 11:32 AM Underground pipe - PVC vs Ridgid wrapped  
aldav53  Offline
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
I've come across quite a few underground pool pump & light ridgid installations that were correctely wrapped but had rusted out anyway and eventually caused the wires to either short and/or open, and the pool pump quit in residential homes. Usually takes 5 to 10 years.
No matter how well you wrap it, I think water gets through over time. The soil here in AZ is acidic too.

The Golden Rule - "The man with the gold makes the rule"

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#99792 - 09/10/06 12:19 PM Re: Underground pipe - PVC vs Ridgid wrapped  
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
We have to keep in mind that the NEC is a minimum safety code, not a design manual.

Personally I feel the only use for PVC is underground.

I am not a fan of GRC underground, but I do not feel it should be prohibited.

Bob Badger
Construction & Maintenance Electrician

#99793 - 09/10/06 01:04 PM Re: Underground pipe - PVC vs Ridgid wrapped  
gfretwell  Online Content

Joined: Jul 2004
Posts: 9,124
I think it is going to be a local call. In Md I have seen garden variety EMT hold up for a long time underground but like Aldv, here in Florida, even rigid goes pretty fast.
Vote me "plastic" too.

Greg Fretwell

#99794 - 09/10/06 01:08 PM Re: Underground pipe - PVC vs Ridgid wrapped  
aldav53  Offline
Joined: Aug 2001
Posts: 545
Chandler, AZ USA
gfretwell, I agree..

The Golden Rule - "The man with the gold makes the rule"

#99795 - 09/10/06 02:48 PM Re: Underground pipe - PVC vs Ridgid wrapped  
macmikeman  Offline
Joined: Jul 2002
Posts: 717
Honolulu, Hawaii
Concrete encased pvc buried pipe gets my votiest vote of all.

#99796 - 09/10/06 09:05 PM Re: Underground pipe - PVC vs Ridgid wrapped  
Fred  Offline
Joined: Apr 2001
Posts: 449
Straughn, IN 47387
I prefer PVC for underground work. We just installed 500' of 4" sched 80 in 3 parallel runs Friday. They ran from the padmount transformer to the future mechanical room location for a church addition. We put them 66" below the pad and bedded them in 24" of coarse sand before backfilling. Nobody should come near these pipes, but if they do they are going to see sand before they hit PVC, I hope. The same excavator is doing all of the digging on this job. My conduits under the slab will be done the same way only they will be 48" below the slab. Well below the plumber's drains.

#99797 - 09/11/06 10:47 AM Re: Underground pipe - PVC vs Ridgid wrapped  
Zapped  Offline
Joined: Oct 2002
Posts: 482
Huntington Beach, CA, USA
Out here in Orange County, CA, I try to use nothing but PVC underground. Not only is the soil super acidic (especially near the ocean), but alot of the irrigation systems are run with reclaimed water - metal of any kind doesn't stand a chance. I've even run across rubberized-rigid that corroded right inside the rubber from a leak at one of the joints, and just disolved into oblivion.

Concrete-encased PVC is nice, as it's basically just a plastic-lined concrete conduit. I've seen this in the snack bars that are actuall ON the beach. Works great until a plumber comes along with a concrete saw... Gotta love plumbers, they keep my bills paid =)

#99798 - 09/11/06 08:53 PM Re: Underground pipe - PVC vs Ridgid wrapped  
electure  Offline

Joined: Dec 2000
Posts: 4,262
Fullerton, CA USA
Zapped, You're from HB!

GRC, IMC, or EMT aren't even permitted to be installed outdoors abovegroundin your town unless they are painted with a marine grade paint (that's about $65 a gallon). [Linked Image]

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