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Student & Learning Zone - City & Guilds
RCD for Fault Protection
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<blockquote data-quote="phil d" data-source="post: 517732" data-attributes="member: 27126"><p>I was discussing this the other day with somone, and we came up with a few interesting observations, now an RCD operates when it detects an imbalance in the circuit caused by either phase or neutral going down to earth, now ok we all agree this is a fault and so the RCD should trip.However suppose we get a dead short, phase to neutral, this too is a fault, but one which won't trip and RCD! I think there's far too much reliance on these devices these days, and even worse in my opinion is the test scenario that if it trips at the outgoing terminals then the RCD is good, no matter wether or not it trips at the point of use.</p><p></p><p>Now I know that in reality no decent spark would leave a device in circuit that failed to trip at point of use, but my point is this, if you take it that according to the regs and testing procedures, an RCD behaving in the manner I have described would still be fit for service, how I wonder would the coroner take it at an inquest? Imagine it, ' well your honour I knew there was a chance someone could be killed, but the regs said it was fine so I left it and sure enough the man died mowing his lawn' . Would you want to be that spark, I don't think I would.</p></blockquote><p></p>
[QUOTE="phil d, post: 517732, member: 27126"] I was discussing this the other day with somone, and we came up with a few interesting observations, now an RCD operates when it detects an imbalance in the circuit caused by either phase or neutral going down to earth, now ok we all agree this is a fault and so the RCD should trip.However suppose we get a dead short, phase to neutral, this too is a fault, but one which won't trip and RCD! I think there's far too much reliance on these devices these days, and even worse in my opinion is the test scenario that if it trips at the outgoing terminals then the RCD is good, no matter wether or not it trips at the point of use. Now I know that in reality no decent spark would leave a device in circuit that failed to trip at point of use, but my point is this, if you take it that according to the regs and testing procedures, an RCD behaving in the manner I have described would still be fit for service, how I wonder would the coroner take it at an inquest? Imagine it, ' well your honour I knew there was a chance someone could be killed, but the regs said it was fine so I left it and sure enough the man died mowing his lawn' . Would you want to be that spark, I don't think I would. [/QUOTE]
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RCD for Fault Protection
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