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 119 replies
  • Subscribers 32 subscribers
  • Views 17492 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

Type A rcd . EICR coding ? etc

aligarjon
Hi Guys.   Not been on for a long time, just had a bit of a search and couldn't really find anything so thought i would ask and see what you all thought.


1.  Are we or will we be coding type AC rcd's if there are LED's or induction hobs, lots of electronics  etc  present.

2. How much DC leakage does it actually take to saturate an rcd and cause  problem?

3. How much does a standard LED lamp or induction hob  leak ?

If we test an AC RCD with no load and it's fine then re-test it with all LED lights, induction hobs etc turned on and it operates correctly could we then say that it is ok with a note on EICR  OR EIC if installing any of the above.  


Obviously also on an EICR if the RCD then doesn't operate with it all on it becomes a C2 ?


Any thoughts



Gary
Parents
  • 0
    But any normal ("AC") RCD will sense all of the waveforms except 6,8 and 9, just at about twice the RMS current that it trips on a pure AC. Sure the DC component does not couple through the transformer core, but the a wavefor of the same peak-to peak amplitude makes it through - just shifted in the Y direction to have an average value of zero, just liek a real AC.

    Only an "AC" design with a very undersized core may suffer some loss in sensitivity, but it will not be totally blinded.

    That requires the other waveforms.


    Those drawings would be much less dangerous if the neutral 'N' was omitted from 7 and 9
Reply
  • 0
    But any normal ("AC") RCD will sense all of the waveforms except 6,8 and 9, just at about twice the RMS current that it trips on a pure AC. Sure the DC component does not couple through the transformer core, but the a wavefor of the same peak-to peak amplitude makes it through - just shifted in the Y direction to have an average value of zero, just liek a real AC.

    Only an "AC" design with a very undersized core may suffer some loss in sensitivity, but it will not be totally blinded.

    That requires the other waveforms.


    Those drawings would be much less dangerous if the neutral 'N' was omitted from 7 and 9
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