Sisyphus
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- Reaction score
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From an on the ground engineering point of view how exactly do you fault find the cause of an AFDD tripping especially if it is a nuisance trip with no test equipment available to verify the operation of the unit, does an AFDD's ability to detect a fault degrade over time or if it detects a fault does that reduce it's future efficacy or do you just replace it, there seems to be so many unknowns and unanswered issues with this new piece of kit you have to wonder why the IET have jumped in feet first on this one
AFDD nuisance trip inquiries are a daily affair @ NEC chatrooms
All manner of conjecture are usually entertained.
There are 'testers' marketed by the same manufacturers of them , but simply looking for something parallel Vs series usually reveals the problem
That our system incorporates a neutral makes this all the more tedious
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Our AFDD's state right in the manufactured instructions to remove them prior to any megging
Which over time mother nature may introduce.
So what we installed 20 yrs ago may 'test' as far as the unit's test button , but there is (as yet) no lockout feature UL mandated for our GFCI's , over 50% (their studies) confirmed
~S~