This is perhaps a bit niche but who knows. As a small UK based architects practice, we often do electrical/lighting layouts for projects. These have long been done in a 'dumb' way - i.e. symbols for fittings, switches, sockets etc. and polylines indicating wiring routes. We don't really get involved in voltages and the actual detail of the electrical system, just the position of things.
Getting a bit more advanced, we can create a key for our sheet layer using worksheets that schedul