Power distribution cabin.

This is the interior of one of several power distribution points on the Royal Edinburgh Military Tattoo. It is fed by a 400A 3-phase 240/415V supply which it then divides down through suitable protection to the final circuits, each of which is protected by an RCD (GFI) for safety.
All the units you see in the cabin are designed for touring shows, and when the lids are fitted they turn into flightcases that can be rolled about with modest ease.
We protect every single circuit with earth leakage protection for safety, and also to ensure that if something develops a fault or gets drenched then we only lose one or two bits of equipment at a time.