UK Advice on testing RBOS in prison

[mat ogrady]

starting to test in a prison. does anyone know why the rcd trip test does not work when done directly on to the rcbos

 

[westward10]

What brand are they, Memshield 2?

 

[pc1966]

Do they trip on the self-test button?
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I seem to recall someone pointing out that in some types of RCD device the current sense transformer is not always fully before the terminals so testing at the screws might not match the out-going wires.

Of course I might be havering!

 

[westward10]

Do they trip on the self-test button?
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I seem to recall someone pointing out that in some types of RCD device the current sense transformer is not always fully before the terminals so testing at the screws might not match the out-going wires.

Of course I might be havering!

Yes Memshield 2 which is why I asked in #2.

 

[pc1966]

Yes Memshield 2 which is why I asked in #2.

Good to know my havering ratio is low enough so far!

 

[marcuswareham]

I have C/U with memshiled MCBs in. I have converted some to RCBO via the MEM pod which clips to the top of the MCB. I guess this is how most of the memshiled RCBOs are done. the pod has a flying N lead and N terminal but the Line conductor is fed though a hole in the pod (though RCD coil) and it is terminated in the screw terminal on the top of the MCB. So as said above testing on the screws will mean you are connecting Line before the RCD coil

I had a pod that was broken and was spare so had a look inside, here it is incase interested

 

[Andy5678]

Use a needle test probe through the line conductor entry terminal when testing

 

[westward10]

Or get a one gang extension socket with fly leads and connect into each rcbo.