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 28 replies
  • Subscribers 32 subscribers
  • Views 2417 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

Up front S type RCD tripping

Grobbyman
Rural setting. Two adjacent houses from the same pole.

The one I've been called to has had intermittent tripping problems on the 100mA S type RCD, it's TT, since just before christmas.

Seems to be no rhyme or reason and consumer unit 30 mA RCD's (two) not affected.

Called in on Friday and tested the upfront and tripping times good, ramp tested at 60mA.

Disconnected the only circuit not covered by the consumer unit RCD'd (garage) and asked them to keep an eye on it.


Called Friday night and told me it's tripping again.


Asked next door, who are in the process of rebuilding, whether anything new about christmas time.


Seems they got a new induction hob with boost facility then.


Turned it on, pressed the boost and low and behold next doors S type tripped.


Seems to do it everytime.


Doesnt affect the premises RCD's (30mA's).


Any explanations?


Had a look at the pole can't see anything amiss.


Regards


George
Parents
  • 0
    I had something slightly similar. A lighting circuit in a garage tripping the 100mA S Type front  end RCD on the house. The 30mA RCD in the garage from a different supplier did not trip. All IRs etc good and no significant earth leakage. There was a faulty new HF Fluorescent in the garage which was slow to start failing completely a couple of weeks after installation and a newly installed S type RCD with possibly dodgy filtering, the manufacturer replaced it but never admitted the original was faulty and no more problems. I never found out if the new RCD cured the problem as I replaced the dodgy fluorescent at the same time.
Reply
  • 0
    I had something slightly similar. A lighting circuit in a garage tripping the 100mA S Type front  end RCD on the house. The 30mA RCD in the garage from a different supplier did not trip. All IRs etc good and no significant earth leakage. There was a faulty new HF Fluorescent in the garage which was slow to start failing completely a couple of weeks after installation and a newly installed S type RCD with possibly dodgy filtering, the manufacturer replaced it but never admitted the original was faulty and no more problems. I never found out if the new RCD cured the problem as I replaced the dodgy fluorescent at the same time.
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