My water heater switch is located in the service yard. It is just beneath the distribution box. When I unscrew the switch, I found that the wire behind it is very short and is not possible for me to change it. I tried pulling the wire down a bit but there isn't much to pull. The wire comes out from the distribution box and it comes out from a hole made in the distribution box. The hole has a rubber ring around it.
I wonder how is it possible that the wire is so short ? Does it mean I have to open up the distribution box ? But it very dangerous to open the distribution box as there's where the main supply comes in.
Could anyone advise me how to change this switch ? Thanks you very much.