Might be a silly question this but is there a standard convention concerning the routing of wires in a house? I would like info specifically on light switches; so if I am looking at a light switch in my lounge, would the wires go straight up, straight down or what? Are the upstairs switches different? My house has a concrete floor so the wiring cannot go under the floorboards - don't know if that makes a difference or not.
The reason I ask is that I need to do some drilling and although I will use a cable detector first, I would like to avoid any obvious pitfalls.
Many thanx,
Andy.