Here's a good one. Code requires the furnace to sit on a dedicated circuit. the circuit that was currently installed was a 20 amp shared. So I ran a new 15 amp run from the breaker box to the furnace room.
Code also requires a furnace shut off within close proximity of the furnace. Typically this is like a little light switch that comes off of the Furnace supply or a breaker sub panel. The installed furnace did not have one, or so I thought.
While running a new wire from the breaker box I found the shutoff, it was located all the way across the basement, above the drop ceiling, and on the floor footer. Sometimes when you are reading the code and you read one that makes you say what kind of stupid motherfucker.. Well, the kind of stupid motherfucker that would do this.