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Discuss RCD won’t trip help needed in the Electrical Forum area at ElectriciansForums.net

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TT system, have upfront 60947-2 with added on 61008 with mA and ms settings, now I’m getting Zdb of 22.9 ohms and Ka of 4.0, now the RCD can be what ever I set it to but I’m struggling, I’ve set it to 300ma and 300ms but can’t seem to get it to trip? I also have a split phase supply so have L1 and L3 and N but can’t trip on either phase thanks
 
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Strima

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Arms
Esteemed
Have tried with the RCD delay set to zero?
 
T

The Ghost

Long shot but have you tried the manual trip on the RCD. I have found a few times that because no one has ever tested with the manual button the RCD sticks and you have to switch it off and on before the manual works let alone test current on the circuit.
 
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  • #5
Long shot but have you tried the manual trip on the RCD. I have found a few times that because no one has ever tested with the manual button the RCD sticks and you have to switch it off and on before the manual works let alone test current on the circuit.
Yes mate, all ok the RCD I have has a green LED light to show RCD function is on, thanks anyway and it’s brand new
 
What reading does your tester give the 300ms may exceed its threshold.
 
  • Thread Starter Thread Starter
  • #11
I have another lad coming tomorrow with a different tester and I have a Martindale ET4000 and yes tester will not give a reading above 300ms flashes red but surely the RCD should trip within 300ms x1 to comply?
 
The 300ms may be a stopping factor, for example tripping is achieved after 300ms and not up to 300ms. You need to read the instructions.
 

Strima

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Arms
Esteemed
That’s an additional 300mS to the tripping time the RCD normally has.
 
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