Rcds not tripping at 50ms now

[Wilson12]

Hello
I've got a rcd
It trips at 1 times okay but gets greater than 50ms at 5x on one cycle but it's okay on the other cycle on three rcbos out of 5 it's not the circuit I've swapped over the cable what's that mean what will happen

 

[telectrix]

1st try a different tester. if still > 40mSec. @ x5, then it's a failed RCD, but be sure to test without the outgoing RCD terminals NOT connected to circuit/s.

 

[Wilko]

Agree with Tel, and confirm the type of RCD is AC (say) and your tester is set to test AC. If that makes any sense ...

 

[Andy78]

As said, make sure your outgoing circuits are disconnected and re-test.
Over 40ms @ 5x is not compliant.

What make are the RCBOs ?

 

[Pete999]

Hello
I've got a rcd
It trips at 1 times okay but gets greater than 50ms at 5x on one cycle but it's okay on the other cycle on three rcbos out of 5 it's not the circuit I've swapped over the cable what's that mean what will happen

1 RCBO is suspect
2 Change RCBO

 

[Richard Burns]

It has all been said above.
If the RCD does not work it has failed, but eliminate the possibility of the attached circuit affecting the RCD before you just change it, especially as you have this on three RCDs.

 

[telectrix]

and if you can't fix it with a hammer, it's definitely an electrical problem.