The wiring in this commercial establishment is such a mess it's hard to know where to start, so it may as well be with the service entrance.
These always tend to be messy here, but note the cables to the heating contactor (black box, lower left) just draped along the floor:
Here's the view slightly to the right:
The MEM 3-phase switch-fuse is no longer in use (everything is running on one phase), but still has power applied. Note the "deliberate mistakes" in the way it was installed:
Here's what's left of a light fitting, now suspended solely by the wiring. Note also the method of junction box wiring, which is repeated throughout much of the store:
The light and exhaust fan wiring in the W.C. area: