Lifts
I posted this last year:-
In the 1990s one of our customers moved to new larger premises as their business expanded. They had started with a single computer, and then a small 10BASE-2 network with the cable carefully snaked around their main office (tied to ceiling panels, run under carpet edges etc.). Our software ran on a small server in the corner. Fortunately we had persuaded them to install network cards with both 10BASE-2 and 10BASE-T connectors as we knew that they had bought land to build new premises. A couple of years later we were asked to help move the network to the new building that they had built themselves (they were in the building trade).
They had build a small comms room under the stairs with a couple of 19" rack slots and square section steel drainpipe conduits down the wall for the cabling. We bought them a 16 port switch to temporarily connect two computers in the reception areas, and a new server placed under the receptionists desk. We moved the software to the new server - It worked. The owner said that the "proper" cabling was being installed over the weekend next week (Yes, AFTER the building was built), and asked us to move the server and switch to the comms room on the Friday after they closed.
On Monday they phoned us and said that nothing was working and we needed to be there. When we got there they said that it must have been us moving the server that broke everything as no-one could log-on. After faffing about for a while we realised that it must be the cabling. I disconnected all of the wiring to the switch except for the server and connected the nearest reception computer with a 10m ethernet cable - The receptionist could log in. After experimenting we found that a couple of users in nearby rooms could also log in, but when we connected up the others everything stopped working. We got blamed for recommending the fancy new networking when the old coax stuff "had worked fine". I made up a ~30m cable and ran it from the switch, up the stairwell, to the bosses office in the upstairs corner of the building - He could log on, when we connected "their" cabling he couldn't.
I asked who had done the cabling - It was his brother in law, who "knows what he is doing, he's an electrician". Oh dear, the conduiting went past the wiring and motor for the lift and the main air-con unit. We pulled one cable and saw that the sheathing was damaged where he had pulled it through the metal conduit. The business owner got a mate's brother, who's business was actually cabling, to rewire it properly. They earthed the metal conduit and ran lengths of ABS piping down it from the top and put labelled patch panels in at the top and bottom. I suspect that the brother in law didn't get paid.