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Do-It-Yourself (DIY) Question & Answer Forum
Light fault 'tripping' RCD on the ring circuits.
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 554640" data-attributes="member: 250"><p>Have you ramp tested the RCD to see how sensitive it is?</p><p></p><p>remember that although a 30ma RCD MUST operate with faults greater than 29ma.. [approx 7watt load]</p><p>they can also operate with anything from 16ma... (Must NOT operate at 15ma). [approx 3.5watt load]</p><p></p><p>Did you do any continuity / insulation resistance tests on the lighting circuit that you found water ingress at a fitting?</p><p></p><p>Do you have any other outdoor wiring / accessories connected to any of the socket circuits?</p><p></p><p>Have you done any insulation resistance tests on all of the socket circuits supplied via the RCD?</p><p></p><p>It could be an accumulation of multiple problems; Natural leakage, Deteriorating wiring that you have not yet tested or identified, Oversensitive RCD... etc.. etc...</p><p></p><p>Without some more factual test results there is a significant amount of guesswork trying to establish the actual cause..</p><p></p><p>However, from past experience the majority of RCD tripping faults have a correctly operating RCD.. But if an RCD is faulty, generally it fails to trip at all, or will not mechanically reset ON... Over-sensitive RCD faults tend to be the minority of problems! </p><p></p><p>This thread is yet another example of the inconvenient consequences of cheap single RCD installation -vs- bit more expensive but far more reliable full RCBO installation..... Although it may comply with BS7671 it is a pain in the bum and can be very time consuming trying to track down intermittent RCD faults.</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 554640, member: 250"] Have you ramp tested the RCD to see how sensitive it is? remember that although a 30ma RCD MUST operate with faults greater than 29ma.. [approx 7watt load] they can also operate with anything from 16ma... (Must NOT operate at 15ma). [approx 3.5watt load] Did you do any continuity / insulation resistance tests on the lighting circuit that you found water ingress at a fitting? Do you have any other outdoor wiring / accessories connected to any of the socket circuits? Have you done any insulation resistance tests on all of the socket circuits supplied via the RCD? It could be an accumulation of multiple problems; Natural leakage, Deteriorating wiring that you have not yet tested or identified, Oversensitive RCD... etc.. etc... Without some more factual test results there is a significant amount of guesswork trying to establish the actual cause.. However, from past experience the majority of RCD tripping faults have a correctly operating RCD.. But if an RCD is faulty, generally it fails to trip at all, or will not mechanically reset ON... Over-sensitive RCD faults tend to be the minority of problems! This thread is yet another example of the inconvenient consequences of cheap single RCD installation -vs- bit more expensive but far more reliable full RCBO installation..... Although it may comply with BS7671 it is a pain in the bum and can be very time consuming trying to track down intermittent RCD faults. [/QUOTE]
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Light fault 'tripping' RCD on the ring circuits.
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