I had to fit a timer on the immertion heater. I went in the distribution box, I put down the breaker in question MCB/B20 I checked for any power with my tester at the end of the wires in the HP, no power so I thought that I was safe, what happened was by two times when I was working with the wires, the 63A RCD breaker went down? I didn't get any shock.
Now I am very confused because I thought that with the MCB down I was safe.
after investigation in the DB I realised that my MCB/B20 has it Neutral in common via the neutral busbar and it earth in common too via the earth busbar so If my N & earth comes into contact ( even if the Live is not powered) because they are on a common busbar and the other circuits are powered and on the top of that an appliance is working this could closed the circuit an make it goes down? I started to think that it could be the reason why my 63A RCD went down.
Could somebody tell me if this makes sense to them?
Also is there a reason why in the DB my N (MCB/B20) is twisted with an other N and connected together on the neutral busbar because there is a lot of empty connectors, I don't know why this has been done like this? is that a rule or what?
thanks
Now I am very confused because I thought that with the MCB down I was safe.
after investigation in the DB I realised that my MCB/B20 has it Neutral in common via the neutral busbar and it earth in common too via the earth busbar so If my N & earth comes into contact ( even if the Live is not powered) because they are on a common busbar and the other circuits are powered and on the top of that an appliance is working this could closed the circuit an make it goes down? I started to think that it could be the reason why my 63A RCD went down.
Could somebody tell me if this makes sense to them?
Also is there a reason why in the DB my N (MCB/B20) is twisted with an other N and connected together on the neutral busbar because there is a lot of empty connectors, I don't know why this has been done like this? is that a rule or what?
thanks