On Wednesday, 14 March 2018 18:42:41 UTC, The Natural Philosopher wrote:
On 14/03/18 18:28, tabbypurr wrote:
On Wednesday, 14 March 2018 17:48:30 UTC, Rednadnerb wrote:

It's mice.

By a process of elimination I have narrowed the problem down to two lengths of cable, both run under the hall floor.

Thank you all. I now just have to decide whether the occasional RCD trip is worth taking up the floor boards for.

If an RCD trips it's because stuff is shorting out. That's a fire risk.


No, it is not

It is because there is current getting to earth other than via the RCD,
whicjh is not a fire risk

It could be no more than too many RF filters across the mains, which is
not a fire risk

It could be because there is a neutral/earth short somewhere, which is
not a fire risk

It could be because a heater element is slightly leaky., which is not a
fire risk

In fact RCDs are really there to prevent electric shocks due to improper
earthing or erth leak faults. They are not there to pervenet fire riss
#
That is the MCBs' job along with appliance and plug fuses.

With respect he said it's mouse cable damage. We've no way to know if the shorting or leakage is L-E or N-E. Leakage can often icnrease oevr time, and as carbonisation occurs it can become a fire starter. An MCB won't do anything until i exceeds it's rated current by a fair margin. A fire can be started before that happens. Obviously that situation is a fire risk.


NT