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RCD Tripping.....External influences...

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dlt27

dlt27

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Had quite a few problems lately with rcd's on dual boards tripping and on 2 occasions I haven't been able to find the problem (trips once every couple of days) . I have meggered circuits, ramp tested rcd, used megger mA meter for earth leakage etc. On both occasions there was an earth leakage of 10mA for entire board so shouldn't trip rcd. However I changed rcd to rcbo's and haven't had a call back since.
I have heard in the past people saying about external influences causing rcd's to trip. However I don't understand how this works. Can somebody explain in simple thick electricians terms how this can happen. The funny thing is with the last rcd the owner said it only started tripping since eon replaced an 11KV overhead cable.(Last one was taken down live by tatters). Thanks to anyone who has patience to explain....
 
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I had a new 100mA S type on a distribution circuit that would trip before a 30mA on the final circuits when a HF fluorescent was turned on. Turned out to be a faulty 100mA RCD which was tripped by interference, a replacement from the same manufacturer had no problem.
 
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It was explained in the link i give you .... if you find it hard to grasp dont worry learn to walk before you run..... the imbalance isn't a measured one you have on the load side ... its like a biased created normally on the L - E from effects like capacitance due to the PD been 230v where the same capacitance is present on the N side with little or no PD to earth the effect is small so you get a generated imbalance that the RCD core see's before you even consider your own leakage of your loads.... and i dont think you can measure it either it can be created by heavy loads switching in adjacent properties etc ....not easy to understand but as i said dont worry i doubt you'll ever see this issue due to these causes again.
 
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