OP
FAA Greenie
Templar - have a think about what happens when you press that test button.
I suspect you have a N-E fault. Your radio probably doesn't even draw 30mA so wouldn't trip it anyway.
Try testing the T button on the RCD with ALL the MCBs tripped and circuit neutrals disconnected - I bet it works.
If you have a short N-E in one of the circuits this board supplies, the test current generated when you press the button will be divided through the actual fault path, and also the artificial one provided by the test button. The odds are that the device will not trip because the required trip current will not met.
Worth trying.....
I suspect you have a N-E fault. Your radio probably doesn't even draw 30mA so wouldn't trip it anyway.
Try testing the T button on the RCD with ALL the MCBs tripped and circuit neutrals disconnected - I bet it works.
If you have a short N-E in one of the circuits this board supplies, the test current generated when you press the button will be divided through the actual fault path, and also the artificial one provided by the test button. The odds are that the device will not trip because the required trip current will not met.
Worth trying.....