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Incorrectly sized lugs on busbars

Mark Whittingham
Hi,

What are your thoughts on installing 300/16mm Lugs on 300mm singles connecting to 12mm holes on a busbar. We have found this today inside a newly installed transformer and in my opinion its not good practice at all. The lugs should really match the hole size and bolt size?
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  • 0
    I agree, not good practice and potentially likely to fail.  Have they used a large thick appropriate material washer under the bolt/nut.  If not I would say definatly needs redoing.  With a suitable washer or better still well designed clamp plate it might be OK.  That will depend on the contact surface areas and clamping force.  Washer material expansion may also cause problems depending on thickness and material compared to the bolts.

    Hope this helps
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  • 0
    I agree, not good practice and potentially likely to fail.  Have they used a large thick appropriate material washer under the bolt/nut.  If not I would say definatly needs redoing.  With a suitable washer or better still well designed clamp plate it might be OK.  That will depend on the contact surface areas and clamping force.  Washer material expansion may also cause problems depending on thickness and material compared to the bolts.

    Hope this helps
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