Chris Pearson:
So the least bad solution might be to rewire the circuit.The tenant does NOT want that. I have talked to her and she is happy that the electrics are safe (it passed EICR five years ago and nothing has changed). She works from home and has children. Re-wiring would be very disruptive and very dusty because wires are buried in the wall and not conduited. The house is full of furniture which would have to be removed. It would be a nightmare for her.
If the house was between tenants and empty I might agree.
My only concern is the lighting cables them selves are not protected but as long as the circuit is protected by RCD or RCBO this would then be a C3 and possibly deal with the C1
Chris Pearson:JPCoetzee:
Some of them have roughly-tacked together wooden back boxes and these should be metal (!).No!
If you put in metal back boxes, you potentially have exposed conductive parts because of the screws unless the switches are of a type which conceal them.
The wooden back boxes may be as rough as a badger's ars*, but so long as they are reasonably sound, they are unlikely to present a danger. If some of them are roughly tacked together, are others beautifully joined, or what? ?
Heh, no. Some of them already have metal back boxes. I guess the recommendation for a metal back box rather than wooden is to make the whole assembly more structurally sound.
I may put a shallow plastic surface box instead, if that can work. I will be using nylon screws everywhere.
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