I customer of mine is moving a branch office location and needs their network moved and new wiring for voice and data. I pull new lines and work with the Internet vendor on the backboard for the gear. The installer puts up a 2×2 back board above their current one and arranges his equipment nicely on the top leaving me plenty of space. I mounted a 24 port patch panel and 66 block leaving space above the patch panel for the switch and firewall/router and space below for the phone system to be moved.

Fast forward to the next day when I return to move the network gear, only to find that the moron phone guy moved the patch panel up and put the phone system in the middle of the board and mounted power adapters below the system rather than on the side which would have left the patch panel in place. Incompetence at its best, plus he mounted to crooked.

Take away lesson, grab a sharpie and clearly mark DO NOT MOVE, SPACE FOR NETWORK EQUIPMENT.