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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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    The same is true about MCBs and fuses used for short circuit protection, they react after the initial flash, bang and wallop.


    At least MCBs and fuses used for overload protection should go first thus avoiding a flash, bang and wallop, also a RCD may detect failing insulation in its early stages of deterioration rather than waiting until after the event.


    Andy B.
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  • 0
    The same is true about MCBs and fuses used for short circuit protection, they react after the initial flash, bang and wallop.


    At least MCBs and fuses used for overload protection should go first thus avoiding a flash, bang and wallop, also a RCD may detect failing insulation in its early stages of deterioration rather than waiting until after the event.


    Andy B.
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