Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 5 replies
  • Subscribers 31 subscribers
  • Views 543 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Case 2. C.P.C. corrosion in T&E cable.

Zoomup
Today I stripped some 2.5mm2 T&E cables that run in 25mm black plastic conduit outside. The cable was continuous with no joints in the conduit boxes. The plastic conduit showed signs of being overheated in the sun at some period through the day. I had to cut the cable to make a joint, and I found that the C.P.C. showed signs of corrosion, just starting to show, nothing serious but enough to cause concern. I repeat, the cable had not been jointed when I found it and was continuous with the outer sheath intact throughout.


I can only conclude that the cables's outer sheath has let in moisture, even though the cables run in plastic conduit.


Is this why the Regs. do not advise running P.V.C. cables submerged in water? P.V.C. is not totally waterproof. 522.3.

https://www.belden.com/blog/broadcast/waterblocking


Z.

Parents
  • 0

    Chris Pearson:




    whjohnson:

    Agree - I have seen large SWA dragged through ornamental lakes and ponds just to get the length and cost down - they end up paying twice because it is not submarine cable and is not designed to be submerged for any length of time.

    SWA run outside is pretty much ok since the rainwater runs off it. But it was never designed to be run underwater.

    PVC T&E outside is just pants.

    Use NYY or SWA instead




    What about running SWA underground? Isn't that wet?


     




    It certainly can be but at a guess, an in areas other than bogs, the water pressure should be much lower than if the cable was running at the bottom of a lake etc.

Reply
  • 0

    Chris Pearson:




    whjohnson:

    Agree - I have seen large SWA dragged through ornamental lakes and ponds just to get the length and cost down - they end up paying twice because it is not submarine cable and is not designed to be submerged for any length of time.

    SWA run outside is pretty much ok since the rainwater runs off it. But it was never designed to be run underwater.

    PVC T&E outside is just pants.

    Use NYY or SWA instead




    What about running SWA underground? Isn't that wet?


     




    It certainly can be but at a guess, an in areas other than bogs, the water pressure should be much lower than if the cable was running at the bottom of a lake etc.

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines