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Selection of Cable Glands

Nick Parker
Have a question on the selection of cable gland,


1. Cable manufacturer provide tolerance on the dimension of the cable outer diameter (OD) and inner sheath diameter(ID).

2. Cable Gland manufacture provide tolerance for the cable gland diameter under armour (ID) and the outer sheath (OD)

Does Cable ID & OD tolerance should always be within the tolerance band of Cable gland ID & OD?



Sometimes the tolerance band does not match. In those situations, how should we select the cable gland? for example, in the below table, the cable ID and OD tolerance is not within the tolerance band of the cable gland.

Should the ID tolerance of the cable gland be selected such that it excess the maximum cable inner sheath diameter (or) be less than it



 

ID Tolerance (mm)

OD Tolerance (mm)

Cable

25-30

30.3-36.3

Cable Gland (M40)

22-27

35.0-44.2

Parents
  • 0
    Are these BW or CW S.W.A. cable glands? If the gland is too small you may need some Vaseline to lubricate the cable to get it through the hole. (Not good). As long as the armour can be secured reliably then if the gland is a bit too big that does not really matter.....BUT if you need to obtain a good watertight seal then the gland has to grip the outer sheathing of the cable well to keep water out. You are looking for good armour strands grip and sometimes good sealing as well against water ingress. If in doubt try a gland to see if the fit is good before you invest in a boxful. Cable sizes and glands can very in size from maker to maker.


    Edit. Add video by J.W.

    https://www.youtube.com/watch?v=5XST0DkotYw


    Z.
Reply
  • 0
    Are these BW or CW S.W.A. cable glands? If the gland is too small you may need some Vaseline to lubricate the cable to get it through the hole. (Not good). As long as the armour can be secured reliably then if the gland is a bit too big that does not really matter.....BUT if you need to obtain a good watertight seal then the gland has to grip the outer sheathing of the cable well to keep water out. You are looking for good armour strands grip and sometimes good sealing as well against water ingress. If in doubt try a gland to see if the fit is good before you invest in a boxful. Cable sizes and glands can very in size from maker to maker.


    Edit. Add video by J.W.

    https://www.youtube.com/watch?v=5XST0DkotYw


    Z.
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