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 20 replies
  • Subscribers 32 subscribers
  • Views 19295 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

100mA RCDs TT system

Nikkid
Afternoon all,

What is the stance on using 100mA RCDs for TT systems now?

I was under the impression that they are no longer required as long as all circuits were protected by a 30mA RCD within the consumer unit (which in this case they will be).

Just looking for some clarity. 


Thanks! 

Parents
  • 0
    Ian Hildrew:

    Nowadays to reduce the susceptibility to nuisance tripping, good electricians fit every circuit with its own RCBO. Not the cheapest option but it saves call outs from customers. In these cases there is no need for another upstream RCD unless the setup was with the S curve 100mA RCD situated remotely from the CU.


    Yes but the RCBOs would need to be double pole to avoid the S type coming out on a neutral earth fault after the final circuit RCBO had tripped.


Reply
  • 0
    Ian Hildrew:

    Nowadays to reduce the susceptibility to nuisance tripping, good electricians fit every circuit with its own RCBO. Not the cheapest option but it saves call outs from customers. In these cases there is no need for another upstream RCD unless the setup was with the S curve 100mA RCD situated remotely from the CU.


    Yes but the RCBOs would need to be double pole to avoid the S type coming out on a neutral earth fault after the final circuit RCBO had tripped.


Children
No Data

Community Rules & Guidelines