I want to replace a standard wall socket with a new USB which looks something like this...
The instructions say to turn off the power for the socket. I went to the master house control and took a picture...
I assume that I can turn the power off with the big switch on the right that currently shows "ON". I do not know if this must work in concert with the objects containing white, blue, and red dots (don't know what they are).
Question: If I switch it "OFF" will it turn off the power?
Does anything need to be done prior to switching it off? Are the objects to the left involved in any way?
Does switching it off invite any disastrous consequences that I should be aware of?
Does anything need to be done prior to restoring power? Will the house suffer from thermal shock?
As a final thought, if the picture gives an idea of the date or age, I would be grateful. I have been assuming the house is 1940's British Pebbledash.