ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
doc 3
Recent Posts
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
Fire alarm phone lines and color coding
by gfretwell. 08/08/17 10:26 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
239,983 Are you busy
175,581 Re: Forum
167,831 Need opinion
Who's Online Now
0 registered members (), 61 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#99791 - 09/10/06 11:32 AM Underground pipe - PVC vs Ridgid wrapped  
aldav53  Offline
Member
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.
"I'M SURPRISED THIS IS CODE, I THINK PVC SHOULD BE USED".
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"

2017 / 2014 NEC & Related Books and Study Guides

#99792 - 09/10/06 12:19 PM Re: Underground pipe - PVC vs Ridgid wrapped  
iwire  Offline
Moderator
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
Massachusetts

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


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
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
Member
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
Member
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
Member
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
Member
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


Member
Joined: Dec 2000
Posts: 4,260
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]



Member Spotlight
mersadrad
mersadrad
Montreal, Quebec, Canada
Posts: 28
Joined: March 2011
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.017s Queries: 14 (0.003s) Memory: 0.7943 MB (Peak: 0.9545 MB) Zlib enabled. Server Time: 2017-08-20 15:41:03 UTC