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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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    from the point of view of magnetism, steel is sooo much more magnetic than air or copper, that a dog bone, a rectangle  or a round hole  of the same area, or anything in between are very much alike.

    When the data for the material says   'mu is about a thousand ' , 

    That means one mm of air gap is as hard to jump as a full metre flux path in the steel, so the magnetic loop tends to prefer to go the long way round in the magnetic material, and not jump the gap even if you cut really thin slots. The other effect of this is that a really diddly gap on re-building a transformer completely trashes its performance.
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  • 0
    from the point of view of magnetism, steel is sooo much more magnetic than air or copper, that a dog bone, a rectangle  or a round hole  of the same area, or anything in between are very much alike.

    When the data for the material says   'mu is about a thousand ' , 

    That means one mm of air gap is as hard to jump as a full metre flux path in the steel, so the magnetic loop tends to prefer to go the long way round in the magnetic material, and not jump the gap even if you cut really thin slots. The other effect of this is that a really diddly gap on re-building a transformer completely trashes its performance.
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