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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

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  • 0

    how should we select the cable gland?



    I think I've read a manufacturer's suggestion that basically boils down to: take a selection of sizes of glands onto site and see which one fits the actual cable. Because of the manufacturing tolerances in cable dimensions you can't be 100% confident that any one size of gland will always fit a given type of cable.


    Perhaps we would have hoped that cable and gland manufacturers could have got their acts together and used the same tolerance bands for both cable and glands - but I suppose it's a little more complicated as gland typically covers a number of different cable types (e.g. 2-core 16mm² SWA is the about the same diameter as 10mm² 3-core or 6mm² 5-core - all with slightly different tolerances) so if they did we'd probably have a lot more different gland sizes to deal with.


       - Andy.
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  • 0

    how should we select the cable gland?



    I think I've read a manufacturer's suggestion that basically boils down to: take a selection of sizes of glands onto site and see which one fits the actual cable. Because of the manufacturing tolerances in cable dimensions you can't be 100% confident that any one size of gland will always fit a given type of cable.


    Perhaps we would have hoped that cable and gland manufacturers could have got their acts together and used the same tolerance bands for both cable and glands - but I suppose it's a little more complicated as gland typically covers a number of different cable types (e.g. 2-core 16mm² SWA is the about the same diameter as 10mm² 3-core or 6mm² 5-core - all with slightly different tolerances) so if they did we'd probably have a lot more different gland sizes to deal with.


       - Andy.
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