Rcbo problems

[GONK43]

HELLO ALL
Came across some rcbo test results that are baffling me

1 single socket supplying a fridge freezer on 16A rcbo.
Test instrument Fluke 1652
Tested at socket outlet only.

Test results:

1/2 310 No trip
x1 310 @0 Trips
x1 310 @180 Trips
x5 50m/s @0 Trips
x5 50m/s @180 Trips

Tested machine on 30m/a RCD and values were well within limits, less than 40m/s for x5
etc.

Machine just been calibrated too.

Is this a dodgy RCBO or am i doing something wrong?
Should I disconnect circuit and test RCBO on its own?

Disconnected earth lead and repeated test, same results.

Any advice please?

Regards

Gonk43

 

[Amp David]

If you have tried the tests on another RCBO/RCD and all is fine i would be looking at swapping the RCBO over to another one

 

[GONK43]

Amp David

Ta for that. It seems, in the words of Mr Spock, it is the only logical thing to do!
I will advise after changing this part.

Regards

Gonk43

 

[Deleted member 19807]

are you sure you have a good earth, a bad earth will give poor results on rcd testing, and if nothing changed when you removed the earth then i suspect you have already found the fault.

 

[Des 56]

Test at source and not at the socket