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A clear picture in focus would be good .
There IS an earth, there is a bare earth wire going to the back box terminal.
Thanks Terry, is it safe to turn the breakers back on to get the other lights on to take a picture whilst the wires are exposed?
/Looks again/ so there is, my apologies, two earth wires in fact, one in each cable.
I thought that having a lot of individual switches was RCD.
Yes, but only one appears to go to the earth terminal...
It appears that the centre breaker in the area marked "B" isn't an MCB but an RCBO .View attachment 214454
A = Main switch, disconnects everything. Doesn't trip on it's own, it's just a switch
B = Circuit breakers which trip when there is an overload or short circuit. Mainly there to protect the cables from damage. Will not trip if someone touches a live wire.
C = RCD. Trips when an imbalance of current is detected, such as someone touching a live wire. Does not provide any protection against overload or short circuits. Supplies the circuit breakers D
D = Circuit breakers which are connected to the RCD (C). These provide overload and short circuit protection for the cables, and the RCD that supplies them protects people from electric shock.
An older design of consumer unit which probably complied when it was installed, but doesn't now.
Only one CPC connected to earth terminal ,the other is clearly cut off short in the white sheathed cable.Best the OP double checks, but to me it looks as if the grey earth passes behind the white and then it appears both earths are twisted together, up to the terminal.
The switch only needed drying out on the radiator.
Blowing it with a hair dryer for 5 minutes would probably do the same.
When you do refit or fit a new switch, cut the exposed copper down to about 8mm max, what you have is way too long and it exposes live copper.
Try and out some sleeving on the earth wires. Green/yellow is preferred but anything is better than nothing.
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