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 12 replies
  • Subscribers 32 subscribers
  • Views 12708 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

TNCS 6mm main earth - EICR

Stewart Mason
Just wondering what peoples first thoughts are on a 6mm main earth. 0.27ze, TNCS. 80A 1361 main fuse.


Iv'e tried doing a search on here but it did not come up with any results. (Maybe user error!). I'm sure this subject would have come up before.


Thanks
Parents
  • 0
    850A is very quick if you take the right 1361 curves. In general at a ballpark rule of thumb for anything simple and hot wire based, at 10 times the normal 'no break' rating,

    you pass the 0.4 secs required for TN isolation. we are well over 600A, and speed goes as the square of current in this region. even with 3036  the rule of thumb is only a factor of 2 away.
    53e1d3ae6392a6d5354c10a740e5b72d-huge-bs1361_curves_850a.gif


    conclusion, if it was only blowing the fuse we worried about, 6mm will be fine.
Reply
  • 0
    850A is very quick if you take the right 1361 curves. In general at a ballpark rule of thumb for anything simple and hot wire based, at 10 times the normal 'no break' rating,

    you pass the 0.4 secs required for TN isolation. we are well over 600A, and speed goes as the square of current in this region. even with 3036  the rule of thumb is only a factor of 2 away.
    53e1d3ae6392a6d5354c10a740e5b72d-huge-bs1361_curves_850a.gif


    conclusion, if it was only blowing the fuse we worried about, 6mm will be fine.
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