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Cable routing through slotted hole

Baldyhugh
Hi all


Just a quick question roughly regarding eddy currents. Take an example of a single slotted hole from a steel trunking entering a PVC distribution board but could also be metal for the purposes of the example. Some boards have neutral and earths at either side so is it ok to ‘bunch’ all your earths at one side of the slot and all your neutrals at the other due to the location of the bars? I have read other posts that bunching is not advisable but as far as eddy currents go the slot is still a single hole. Hope my question makes sense.


Thanks
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    I think that I can see the reason for concern.


    Think of it another way. Suppose that you make up a brass or non-metallic gland plate. You can put the cables through where you like because the magnetic fields will not be circulating in the brass - they will be in the steel casing of the DB or other equipment. Provided that the cables go through the same hole (of whatever shape) there will be no problem.


    However, I did wonder what would happen in an extreme case - let's have a 100 m x 25 mm long slot with all the lines at one end and all the neutrals at the other. Mike (or anybody else) would that make a difference?
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  • 0
    I think that I can see the reason for concern.


    Think of it another way. Suppose that you make up a brass or non-metallic gland plate. You can put the cables through where you like because the magnetic fields will not be circulating in the brass - they will be in the steel casing of the DB or other equipment. Provided that the cables go through the same hole (of whatever shape) there will be no problem.


    However, I did wonder what would happen in an extreme case - let's have a 100 m x 25 mm long slot with all the lines at one end and all the neutrals at the other. Mike (or anybody else) would that make a difference?
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