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 22 replies
  • Subscribers 31 subscribers
  • Views 14396 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

CSA of main earthing conductor for TT

Grumpy
Morning! Has the minimum CSA of the main earth to the rod changed in the 18th ed? I can't find any reference to it in the BBB (except when buried). 

I have a guy who is insisting on 16mm whereas I "thought" it could be much less if not buried and protected against corrosion and mechanical damage. I only have table 4.4(ii) in my 17th ed OSG as corroboration. Thanks.
Parents
  • 0
    Grumpy:
    Zoomup:

    543.1.1 allows you to go down to 4.0mm2 if certain conditions are met.


    Z.


    I get that Zoom but the man still has to do some sums and if he can't then the default appears to be 16mm. He could do with a nice numpty table like that in my 17th ed OSG!




    There is still a "numpty table" in OSG, but it is now Table 4.4(iii).


Reply
  • 0
    Grumpy:
    Zoomup:

    543.1.1 allows you to go down to 4.0mm2 if certain conditions are met.


    Z.


    I get that Zoom but the man still has to do some sums and if he can't then the default appears to be 16mm. He could do with a nice numpty table like that in my 17th ed OSG!




    There is still a "numpty table" in OSG, but it is now Table 4.4(iii).


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