I used any random cables to build network at one location. It worked very well, except when you turned lights on, there switch disco. Digital communication work

I used any random cables to build network at one location. It worked very well, except when you turned lights on, there switch disco. Digital communication works, until it doesn't. Without testing it's hard to say if it works or not. Cable, environment, connections and network adapters, switches all affect the overall result. Working doesn't mean it would be required to follow specs.