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
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
Re: RNC VS. RMC#124650 11/19/0610:16 AM11/19/0610:16 AM
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.
Re: RNC VS. RMC#124651 11/19/0611:55 AM11/19/0611:55 AM
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.
Re: RNC VS. RMC#124652 11/19/0606:10 PM11/19/0606:10 PM
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.
Re: RNC VS. RMC#124653 11/19/0607:05 PM11/19/0607:05 PM
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.