The three orange cables plus a black cable, are the power wires running into conduit that leads to the house, 3 power lines and 1 24Volt lighting line. They seem to enter the box on the top right, which is cut to go around the 32mm conduit, is in fact a box to channel the extractor fan air to the outside of the power house. So I share the same hole with extractor fan and conduit for the 4 wires.