First I had to connect both the earth and the main line coming from the main switchboard in the house. Previously a 25 mm earthline and 6 mm main supply cable had been buried between the house and the "darkroom-barn". Both enter the barn from below the concrete floor through a PVC pipe that will later be filled with silicon kit to make the electricity entrance completely watertight.
Since the wet side of the darkroom will be exactly at this spot too, I couldn't just guide the cables along the wall. I had to use a watertight connection box, and guide them through security casing buried inside the granite wall. With granite walls you cannot simply machine a trench for the cables. I had to hack it out by hand in the pointing between the granite blocks. I used plaster to hold everything in place and to protect the cables from water damage.
The main line and earth both travel inside a 25 mm casing through the concrete wall to the daylight side of the barn.
Main current, main neutral and earth are connected to the switching board. On the right you already see some of the outgoing cables to lights and connectors. But that's for the next post.
The only access to the live wires is at the switch boards in the house and the daylight side of the barn, and inside the watertight connection box shown here. On the photograph the casing has been pulled back to show how the cables enter. The whole space around the connection box has since been filled with plaster. Only the earth control connection stays visible.
