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Singles in Metal Conduit.

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Mornin' All,

                       you have singles in conduit. The singles run in a horizontal plane to a B.E.S.A. box at the top of the run, and then run vertically downward for about 4+ metres. The cables have weight, and that weight causes the cables at the very top of the run to apply pressure on the insulation where the cables change direction from horizontal to vertical. What is your favourite method to prevent damage to insulation and comply with 522.8.4 and 522.8.5?


Thanks.


Z.
  • 0
    From memory cables should be 'self supporting' up to 5m - so as long as any edges at the top are properly rounded off (good workmanship) I probably wouldn't feel the need to do anything special for a 4m drop.

      - Andy.

  • 0
    Well now, you don't have just one cable in a pipe, so it isn't quite as simple as that.


    In any event, the system seems to work, so I wouldn't worry about it.
  • 0

    Chris Pearson:

    Well now, you don't have just one cable in a pipe, so it isn't quite as simple as that.


    In any event, the system seems to work, so I wouldn't worry about it.




    True Chris, there may be two or three single cables in the conduit as a minimum. We hope that the conduit rough edges have been reamed out!


    Z.

  • 0
    Back when I was trained, in the latter years of the 20th century (actually around 1989), I was taught to file off any rough cast edges on Besa boxes for this reason. My suggestion here would be some form of protection (a piece of box gasket material may suffice?) where the cable bears on the edge of the box.  Or something 'orrible involving cable ties and the innocent earthing screw hole ? (assuming the box is accessible which it should be)
  • 0

    MHRestorations:

    Back when I was trained, in the latter years of the 20th century (actually around 1989), I was taught to file off any rough cast edges on Besa boxes for this reason. My suggestion here would be some form of protection (a piece of box gasket material may suffice?) where the cable bears on the edge of the box.  Or something 'orrible involving cable ties and the innocent earthing screw hole ? (assuming the box is accessible which it should be)




    To my mind the BESA boxes themselves have smooth edges inside where the pipes join. What is essential is to thoroughly deburr the ends of the pipe. A half round file is ideal for this.

  • Former Community Member
    0 Former Community Member
    Conduit reamer or your 8" rough pliers - you'll not make much bonus using a 1/2 round file ?


    As mentioned, you shouldn't be exceeding more than 5m of vertical drop in conduit/trunking, noting that conduit tends to be less of a problem as often cables are in frictional contact with the tube wall


    For trunking, you'd use pin racks


    Regards


    OMS

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