RCD won’t trip help needed

[Bradley6969]

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

 

[Strima]

Have tried with the RCD delay set to zero?

 

[Bradley6969]

Have tried with the RCD delay set to zero?

No, I haven’t so set my mA and leave ms on zero?

 

[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.

 

[Bradley6969]

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

 

[bill01803]

Try a ramp test

 

[Bradley6969]

I did that and no trip still will try again all loads disconnected too

 

[Jim_e_Jib]

Have you set your tester to the correct trip current? It may well default to 30mA.

 

[westward10]

What reading does your tester give the 300ms may exceed its threshold.

 

[Charlie_]

What make and model?
Why have you set the time so high?

 

[Bradley6969]

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?

 

[Bradley6969]

What make and model?
Why have you set the time so high?

It’s upfront RCD so wanted to set as high as possible not set many before so not too sure on ms setting to be honest

 

[westward10]

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]

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

 

[Charlie_]

Do you have the make and models?
Photos, diagrams?

 

[Bradley6969]

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.

Thanks, I tested one exactly same week ago different tester tripped at 370ms so am I wrong in saying it should trip before 300ms?

 

[Bradley6969]

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

Sorry what? So if it trips 350ms for example it’s 50ms?

 

[Bradley6969]

Do you have the make and models?
Photos, diagrams?

I’m back tomorrow so will send pic

 

[westward10]

Thanks, I tested one exactly same week ago different tester tripped at 370ms so am I wrong in saying it should trip before 300ms?

Without seeing the spec this is most likely as it is the trip delay.

 

[Bradley6969]

Without seeing the spec this is most likely as it is the trip delay.

Which setting or are you on about both? It’s for some lodges so hence the upfront RCD as earthing is TT