Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 5 replies
  • Subscribers 32 subscribers
  • Views 2227 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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?
Parents
  • 0
    It rather begs the question of if the busbar is undersized, or if not, then if it  should have been bored with a larger hole... Probably  a bit late to do it now !!

    The important thing is that the full flat side contact area of the lug is held against an equally flat region of the bar, and an undersized nut or bolt head will tend to dish the lug at at microscopic level. I agree that load spreading with washers is the way to go to get full area contact, but it will always be a bit off the proper installation.

    M.
Reply
  • 0
    It rather begs the question of if the busbar is undersized, or if not, then if it  should have been bored with a larger hole... Probably  a bit late to do it now !!

    The important thing is that the full flat side contact area of the lug is held against an equally flat region of the bar, and an undersized nut or bolt head will tend to dish the lug at at microscopic level. I agree that load spreading with washers is the way to go to get full area contact, but it will always be a bit off the proper installation.

    M.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines