The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement

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 12 replies
  • Subscribers 31 subscribers
  • Views 2051 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

Arc Fault Detection Devices

Former Community Member
Former Community Member
Hi Everyone,

I'm just wondering how everyone is faring with AFDDs, especially in commercial/industrial installations?

421.1.1 states that you shall protect against "insulation faults or arcs, sparks and high temperature particles", yet 421.1.7 only recommends AFDDs,


What are everyone's thoughts?


Thanks,

Nathan
Parents
  • 0

    421.1.1 states that you shall protect against "insulation faults or arcs, sparks and high temperature particles"



    I think originally we took the attitude that you protected against insulation faults be physically protecting the insulation (by cable sheath or conduit or similar) or by arranging for automatic disconnection (faults being presumed to be of negligible impedance). Protection from arcs, sparks and high temperature particles was provided by enclosing any device likely to produce such things (be it an MCB, fuse, switch, motor commutator or carbon rod arc lamp) in suitable materials (either the body of the device itself or an outer enclosure).


      - Andy.
Reply
  • 0

    421.1.1 states that you shall protect against "insulation faults or arcs, sparks and high temperature particles"



    I think originally we took the attitude that you protected against insulation faults be physically protecting the insulation (by cable sheath or conduit or similar) or by arranging for automatic disconnection (faults being presumed to be of negligible impedance). Protection from arcs, sparks and high temperature particles was provided by enclosing any device likely to produce such things (be it an MCB, fuse, switch, motor commutator or carbon rod arc lamp) in suitable materials (either the body of the device itself or an outer enclosure).


      - Andy.
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