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#124646 - 11/18/06 08:46 PM RNC VS. RMC  
electure  Offline

Joined: Dec 2000
Posts: 4,262
Fullerton, CA USA
From Scameron81

This is a prime example of why I don't think that you should be allowed to use schedule 80 for service risers. It just doesn't hold up like steel does. These are unprotected 700 Kcmil feeding straight from the transformer. This is along a very busy section of sidewalk. IMO you can't beat 10mil wrapped RMC for a riser

[Linked Image]

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#124647 - 11/18/06 10:31 PM Re: RNC VS. RMC  
mahlere  Offline
Joined: Nov 2005
Posts: 507
New Jersey
unless you are anywhere near an ocean and the RMC rusts out in a few years....

#124648 - 11/18/06 11:19 PM Re: RNC VS. RMC  
Ann Brush  Offline
Joined: Dec 2005
Posts: 152
Or anywhere near where they salt roads in the winter - that stuff EATS just about anything - especially my car.

#124649 - 11/19/06 12:02 AM Re: RNC VS. RMC  
Lostazhell  Offline
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
the 10 mil tape mentioned above is designed to block out the elements when used properly... You'd be just as good using a stick of OCAL conduit (PVC coated RMC) Alot cleaner looking than the 10 mil wrapup [Linked Image]

#124650 - 11/19/06 09:16 AM Re: RNC VS. RMC  
john p  Offline
Joined: Nov 2006
Posts: 32
Just think if this was steel things would of moved and blew up, Now you can shut down and repair this. Etheir way pvc or steel you cant protect every thing. Maybe This should be in a diffent location, If its subject to physical damadge.

#124651 - 11/19/06 10:55 AM Re: RNC VS. RMC  
Rewired  Offline
Joined: Jan 2006
Posts: 558
Hamilton, Ontario, Canada
Actually I have been noticing a lot of older services now that were done in RNC that are coming apart or actually shattering. My parents place was built in the 60's and the service was done in rigid ALUMINUM, well everthing except the galvo mast and the cast LB at the bottom, but in general the service is in better shape than some of the one's I have seen where the PVC is all shattered or the fittings are coming apart and the service conductors are now exposed.


#124652 - 11/19/06 05:10 PM Re: RNC VS. RMC  
renosteinke  Offline
Cat Servant
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
There is a pole near me that has sundry RNC covered lines at ground level. PoCo, Phone, whatever.

The pole is situated that it would be difficult for anything to strike the plastic pipe. Yet, over the years, I have watched the pipes crack and shatter, losing a little more each day. Recently, most of these pipes were replaced with new PVC.

I think the stuff just loses its' plasticisers over time. Perhaps ozone and exhaust fumes just degrade the stuff; I don't know.

#124653 - 11/19/06 06:05 PM Re: RNC VS. RMC  
BigJohn  Offline
Joined: Mar 2004
Posts: 391
Boston, MA
Given that PVC deteriorates in UV and o-zone, weakens in the cold, is generally much more conspicuous than EMT, and is very often improperly installed (no expansion fittings, too few/wrong type of straps), these are reasons I hate seeing PVC above ground.

PVC does have it's place (costal/industrial enviroments with corrosive atmospheres). But it still requires some care to install. There's nothing I hate more than a perfectly straight run of pipe that would've been nice and pretty in EMT or rigid, but instead was run improperly in PVC and ends up being so wavy I need Dramamine just to look at it.


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