Fitting 2 way dimmer switch

ZINXYX

Here is a pic of back ofthe old one.

ZINXYX

Here is a pic of the front of the old one

ZINXYX

Here also is the back of the new one

Myser

It would be useful to have a clearer picture of all the wires coming out of the wall.

ZINXYX

The front of the new with the brown wire

Here again is a better view of the switchbox


Thanks

Myser

That's unusual - only two reds and an earth wire out of each cable?

Which wires are inside the tape? It is difficult to see from the picture?

Also, do you have an electrical tester or multimeter?

ZINXYX

Inside the tape is another red wire.In effect there are two red wires each from the grey cables. However each grey cable has been connected to the green cable.
thanks

Myser

Please distinguish between cables and wires as others have said. It becomes confusing otherwise.

A cable can contain many cores or wires. The grey cables appears to have two red and one earth wire each, correct?

In your picture, I can only see one wire taped up?

ZINXYX

I know and I thank you all for your patience. I see two wires both red from each of the grey cables. Then there are two wires coming out of the green cable which have one connected to each grey cable.
Thanks.

Myser

Was there another wire inside with the taped up one? Or is there just one red wire in there.

The two bare wires coming out from the grey cable are earth wires and have been sleeved (green) and connected to the back box. For safety, you should run a short earth wire from the terminal where the two wires join on the back box to the earth terminal on the switch back-plate.

Do you have any electrical testers or a multimeter?