Should RCD have tripped?

[iwaters]

The other day I was using a circular saw and I accidently cut through the cord, I didn't get a shock as I was only touching the platsic handle but the RCD in the CU didn't trip which I was expecting it should have. The saw was plugged into an extension lead which was plugged into a socket in the garage.

I have always thought the electrics in the garage were a bit dodgy, should the RCD have tripped? Should I use one of those plug in RCDs in future?

 

[gblades]

Possibly the saw was class II and it managed to cut the live wire without it shorting out via the saw blade.

I would say it is highly unlikely so definetly worth a check.

 

[SUNRAY]

Simple.

If there is no earth involved, an Earth Leakage Circuit Breaker (the original name for RCD) will not trip.

The MCB or fuse may blow depending on:-
1) The angle of the cut through the cable.
2) The time taken to cut throgh the cable which can easily be less than tripping time.