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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
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    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.
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  • 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.
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