Usual is a Main loom behind the dash with a separate plug in loom for each door, boot and engine bay.
Door looms are usualy made up of separate looms one for say windows another for door locks and sometimes one for door mirrors but they will be bound into a single piece to pass from door to Main harness through the A post.
Each separete circuit in the looms are fed from a fuse box and protected with fuses, there are banks of fuses in the fuse box, with each bank having a different feed, one bank will be a constant supply, one from the ACC (first turn of your car keys) and one from the IGN (second turn of keys), all this is fed from the battery through a single large fuse (MAXI Fuse) in the engine bay close to the battery.)
Slight mystery to how your loom is damaged, thats why you have fuses
If the switch had stuck closed or a short causing the motor to keep running the self resetting safty feature should of kicked in stopping the motor (try closing or opening a window and keep the button pushed in, you will here the motor stop after a few secs when the safty circuit cuts in.) even if the safety didnt work, all that should of happened is the fuse should have blown (maybe an over rated fuse has been fitted?).
Unlikely but the loom may have been caught somewhere causing a short between two separate circuits, this is where fires can start because a circuit with a small Amp rating can be fed by a circuit with a larger Amp rating. This type of short goes undetected until you get a problem further down the loom i.e a window motor shorts but instead of having, say a 15Amp fused supply it is now getting its own supply plus the supply that should be going to another circuit which could equal to any amount of Amps, these extra amps are then passed to the shorting motor through wire that is rated for just its own fused supply, but since its getting its own supply plus from another circuit it usually heats up like a filement on a kettle, glows, melts its protective coating and other wires around it which then allows the conducting parts of the surrounding wires to touch each other causing a bigger short circuit, more heat, then fire if the main loom fuse dosnt blow :blob6:
Or instead of the motor shorting, the switches have, causing the sitches to melt instead of the wires or the wires in the motor.