About year ago someone started a thread about "Which is better, plastic or Steel?"
I came down squarely on the side of plastic and took some flak for it. My reasons were it does not rust, bust, or collect dust, or it does not deteriate as easily, and was easier fixed if damaged.
Naturally there were those that spoke of the strength of steel. I understand that argument, but my decision stands that I prefer plastic.
Last week, a building engineer at one of our schools was cleaning up behind one of our modular classrooms. When he moved some grass and leaves, he found this pipe. Rigid (not intermediate) that has been in a very long time. The conduit is completely separated, and you can see the conductors. The edges are sharp, and Lord help us in the event of a fault. We have to schedule an outage to replace it WITH PVC.
The last pic shows the footer washed away under the brick, a non-electrical issue to be sure, but still ugly.
So how long has the install been there and what if joe blow maintenance man hit a plastic riser with a lawn mower and it broke. Would you have to schedule a shut down to repair it right??. I'll take steel.
Re: "Which is better, plastic or Steel?"#115254 08/29/0306:56 PM08/29/0306:56 PM
I have to agree with PCBelarge...each has it's own advantage and each has serious disadvantages. I prefer PVC underground, transitioning to metal a couple of inches above grade. This way, the only PVC exposed is usually the coupler, which is naturally thicker plastic and stronger. Metal, especially right near the ocean where most of my work is, WILL disolve eventually if in contact with the soil. You can bet on it.
I recently had an association community with pole lights fed from galv rigid that had corroded and collapsed UNDER ROADS in the community. We had to abandon those runs and route power from other sources, add pilasters, cut through 4" thick roots, etc.. My arms are still sore from all the trenching (in the middle of August, I might add)!
Re: "Which is better, plastic or Steel?"#115260 09/18/0310:38 PM09/18/0310:38 PM