Main rcd tripping even though its 100 ma

[Yr ys]

Hi

There's a workshop outside the main building with a couple of sockets protected by a 30ma rcd. Even though the rcd inside the main fuse box is 100ma the 100 ma rcd trips without the 30ma not tripping. Changed 30ma rcd still same. How can I get the rcd in the workshop to trip without tripping the main rcd?

 

[Deleted account]

We call that the bang test.

 

[Yr ys]

Bang test?

 

[EalingBadger]

Bang test?

Bang Test - as in you plug it in, switch it on and then there is a loud "BANG!".

 

[Toneyz]

My bang tester is due for calibration any suggestions where I can take it?

 

[Bellendian]

Time to invest in a PAT tester by the sound of it...

 

[Marvo]

Did you do a full ramp test on both RCD's? What were the trip times? Was the 100mA RCD faster than the 30mA?