would someone please explain the reasons for having a 0.4 second disconnection time and a 5 second disconnection time, why is there a big difference between the two readings
The 5 second time is bit of a mystery to which no two people could give you a straight answer. It is roughly based on what could be a reasonable disconnection time for a circuit which is highly unlikely to have anyone in contact with it eg a distribution circuit
The 5 second time is bit of a mystery to which no two people could give you a straight answer. It is roughly based on what could be a reasonable disconnection time for a circuit which is highly unlikely to have anyone in contact with it eg a distribution circuit
The legend involves a committee member who has a vested interest in not having the circuits in his employers factory be deemed none compliant, a quick fag packet calculation was carried out and he reckoned 5 seconds would not cause him any difficulty
No idea if its true, but it wouldn't supprise me, things like that make the world go round!
Would that be a 400ms RCD?Rapid disconnection ( 0.4 seconds or less ) if current is leaking out of the protected circuit as the leakage could be causing immediate danger to life ( shock ) or fire ( overheating of material not intended to carry current ). This protection by an RCD
the 14th edition....in this book they talked of close and coarse protection, and fusing factors.
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