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 13 replies
  • Subscribers 30 subscribers
  • Views 2225 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

AFDDs - are they sensitive to upstream arcing?

AJJewsbury
It's occurred to me that if AFDDs work by spotting distortion in the a.c. current waveform that's passing through the device, then they're likely to see the same effect if series arcing is occurring upstream (with a decent sized load downstream).


If that's the case a decent DNO's crackle could trip out a significant number of final circuits if they happened to be loaded at the time.


Or are AFDDs cleverer than that? (e.g. do they look for an undistorted incoming voltage as well as a distorted current?)


As many of the dimming and flickering I've seen has been down to DNO loose connections, there could be a lot of nuisance tripping with these new devices if my worry is correct.


  - Andy.
Parents
  • 0
    Impressive memory (the link to 2008)! I would be surprised at modern RCDs responding in this situation, but old ones with less transient immunity could well do so if the installation has filter capacitors L-E and N-E and particularly if the loose upstream connection is in a neutral.
Reply
  • 0
    Impressive memory (the link to 2008)! I would be surprised at modern RCDs responding in this situation, but old ones with less transient immunity could well do so if the installation has filter capacitors L-E and N-E and particularly if the loose upstream connection is in a neutral.
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