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
  • Replies 4 replies
  • Subscribers 36 subscribers
  • Views 148 views
  • Users 0 members are here
Options
You may also be interested in

Group 1 Medical Location - supplementary bonding - use of junction boxes

Simon Bourke

For the supplementary bonding connections connecting the general power sockets served by the general power circuit  is it permissible to have a junction box installed (in a ceiling void) prior to the EBB in a group 1 medical location to reduce resistance value of the circuit?

See image below for typical arrangement:

Parents
  • 0

    Interesting. My initial thought was that (in the words of an earlier edition of the regs) "joints are a source of weakness", and indeed sometimes significant additional resistance (I think for testing main bonding up to 0.05Ω can be allowed for each joint). On the other hand what you propose isn't that dissimilar from a "ring" bonding conductor approach, which is used in some very demanding situations with good results.

      - Andy.

Reply
  • 0

    Interesting. My initial thought was that (in the words of an earlier edition of the regs) "joints are a source of weakness", and indeed sometimes significant additional resistance (I think for testing main bonding up to 0.05Ω can be allowed for each joint). On the other hand what you propose isn't that dissimilar from a "ring" bonding conductor approach, which is used in some very demanding situations with good results.

      - Andy.

Children
No Data

Community Rules & Guidelines