RCD question

[Bratters]

I was working on a circuit which was switched off at the master circuit breaker. At that point, I considered the entire circuit to be "dead", so I was working on the cable, during the course of which probably all 3 wires came into contact with each other at various times.

This tripped the main RCD at the consumer unit. Is this normal?

 

[ban-all-sheds]

Perfectly normal.

The MCB will only have disconnected the phase conductor, so the neutral was still connected to the neutral bar in the CU.

Then when you touched or otherwise connected the neutral and cpc of the circuit together, you created a N-E fault which the RCD detected, and it tripped.