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Discuss Time delayed RCD in the Electrical Forum area at ElectriciansForums.net

Carlosfandango

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My guys were testing a 500ma time delayed RCD today with our Fluke tester, can’t remember the model, 1556???
I had a go and couldn’t get it to trip either. The tester was set to time delayed setting, 500mA, did the 30s countdown but didn’t trip. Am I doing something wrong?? And yes I was definetly testing the load side of the RCD!😂
 

Risteard

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My guys were testing a 500ma time delayed RCD today with our Fluke tester, can’t remember the model, 1556???
I had a go and couldn’t get it to trip either. The tester was set to time delayed setting, 500mA, did the 30s countdown but didn’t trip. Am I doing something wrong?? And yes I was definetly testing the load side of the RCD!😂
Had you it set to the correct type of RCD, i.e. you weren't DC saturating an AC RCD or something like that?
 

Leesparkykent

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Try it on the circuit not at the terminals. I can’t remember but there was one or two brands that don’t like being tested at the terminals...I don’t know the reasoning behind it, but worth a try.
 

davesparks

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Try it on the circuit not at the terminals. I can’t remember but there was one or two brands that don’t like being tested at the terminals...I don’t know the reasoning behind it, but worth a try.
It's memshield 2 MR30 RCBO pods which can't be tested from the terminal screws because the live sensing coil is on the pod which clips on above the terminal.
 

Pete999

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Tried 2 and 3, no avail!
The RCD is a TP 100amp mccb, 2 years old so doubtful that it’s faulty.
Your 2nd sentence The RCD is a TP 100A mccb? don't compute, mind you it is early
 
I had a similar issue with my Megger MFT Can't remember exactly what I was doing wrong but re read the manual and it worked.
 
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