I'm getting ready to install for a customer, 3 400 watt HPS floodlights on 3 telephone poles. I see everywhere, that when pvc is run outside, the heat usually makes it bowed and it really looks bad. Is this where expansion fittings come in at?? I've never used them before. I'm thinking about just running emt up the pole. What are your thoughts. Thanks for your replies... Steve
sparkync, Over here in NZ, we use PVC conduit to run the mains down poles and into peoples houses. The secret to keeping the conduit straight is to adequately support it with sufficient saddles for the length of run. Also, it should be noted that not using uPVC(UV stabilised PVC) will cause the conduit to buckle and dis-integrate, because of the effects of the sunlight. Ordinary PVC won't last long in direct sunlight!. Hope that this helps.
Re: Pvc up poles??#26390 06/11/0305:27 AM06/11/0305:27 AM
Thanks for the replies. Sparky, if I do use emt, it will not come into contact with the ground, since I will have a weaterproof junction box at the bottom of the pole, and I will be coming into the top of it, then I would use pvc into the ground. To iwire, the customer does own these poles. I know what you're talking about though. The power company frowns on using their poles. I definitely don't like doing my work 2 or three times That's why I try to get it right the first time. Thanks for all the input. This is a great resource for professional information. Steve
Re: Pvc up poles??#26393 06/13/0301:11 AM06/13/0301:11 AM
We use stand-off's on poles here with service entrance PVC, but the PVC has to be schedule 80. and its the UV stuff. It wil definitley look bad if you dont support it every 3 foot. Here in south TX, it takes about half a day to warp the shed80 PVC before you get a chance to install it !!LOL I get to the job and I have to make a pile of banana shaped pipe look good. Ugh, im mostly complaining of the heat right?
Re: Pvc up poles??#26394 06/13/0307:36 PM06/13/0307:36 PM
I have to reaffirm what lonestar said about the UV stuff, My local supply house got in a jam a while back, they had a bunch of non Uv they were selling, I got a chunk of it on a truck one day, It was already Faded and warped from the sun. I live in Northern Minnesota where the frost heaves everything and when supported properly It holds up pretty well.