Peculiar results on rcd trip test

[james beckford]

Afternoon everyone, got a weird one for you all.

Installed electric shower, had to upgrade consumer unit at same time, carried out all dead testing etc, Ze and Zs all good, insulation test perfect HOWEVER

when carrying out RCD trip test from the connector block terminals in the shower the RCD will not trip on I delta 1 at 0 degrees. trips perfectly at all other test settings.

went back and carried out all testing again everything else fine.

im using a fluke if that has any bearing

Thanks in advance for any useful answers.

 

[applemac]

Test it at the board?

 

[44ALLAN]

As above...............your testing the rcd not the shower cct!

 

[Dean Williams]

unless it's a Bill or MEM RCBO. can't test at RCBO itself!

 

[Engineer54]

unless it's a Bill or MEM RCBO. can't test at RCBO itself!

Yes you can, just add a few inches of conductor to the terminals, and test from ends of the conductors!!

 

[Badged01]

Yep, have to agree. Test at the actual RCD and see what results you get there! If the results there are OK Im dumbfounded as to why they are not OK at the shower .....