“… and I got shocked when I turned off the water,” said Luke, as I tucked him in for the night. “Right,” I thought, “how can you get a shock from the water pipes?” Still, I had felt a little twinge earlier in the evening when I had turned on or off the tap in the bathroom sink. I thought it was just one of those little shock-like stabs we get now and then from whatever cause. Still, maybe I’d better check.
We were on vacation at the SIM retreat center in Miango, not far from Jos. It was Monday night, our first night of a six day stay, and we had already changed rooms once because the fan didn’t work in the first one (see how spoiled we are now?). I had to travel to Abuja the next day to give a presentation at a training session for doctors working children infected by HIV, so Barb and Luke would be alone.
In the US, we used to take electrical safety for granted—not ignoring dangers, but knowing that if we followed the rules we would be safe. In Nigeria, all bets are off. One high-priced electrician connected some of our home’s outlets with the hot and ground reversed: touch the outlet screw and get a shock. A hospital electrician reversed the neutral and hot for a whole section of the compound, causing a lot of damage including our hot water heater wires burning. A contractor, repairing wiring in one of the wards, used cheap telephone wire or something similar rather than the proper gauge wire, causing an electrical fire in the ceiling. I won’t go on, but really, electrical safety is a nightmare in Nigeria.
I went into the bathroom and gingerly tapped the tap, this time without my shoes on. Yes, there was a distinct though mild shock. Ah, well, I thought, probably one of those little shocks from some floating ground or something. Pretty strange, though, how would there be an electrical potential between the floor and the cold water pipe? At that point, a prudent course would have been to stay away from the whole mess until I could get a test meter or something, but I curiously (and quickly) dipped my finger into Luke’s now-tepid bathwater. Ouch! This time it was a real shock for sure. The rest of the evening we were careful not to touch the water or the pipes.
Grounding rod and connecting wire
Click on photo for larger view
The next day, I borrowed a voltmeter from dentist Steve Porter and verified that there was indeed high voltage on the pipes. Steve had mentioned that a cracked water heater element could cause this, but turning off the heater didn’t help. Checking the house’s grounding system showed half the problem: a grounding rod was there, all right, but the wire was just loosely wrapped around the corroded rod like a bad joke. So the house’s wiring was a setup for disaster, but still, why was it the pipes that were “hot?”
The second piece of the puzzle was that the plumbing inside the house was metal, but joined to PVC plastic pipe at the outside wall. This meant that the metal pipes themselves were not grounded.
Finally the maintenance crew arrived, shortly before I had to leave for Abuja, and traced the problem. It only happened when something was plugged into a certain outlet. Apparently, the outlet was faulty so that when something was plugged in, the hot wire was pushed over to touch the ground. Somewhere the housing ground wire must be connected to a water pipe. The result was that when the outlet went bad, the whole plumbing system effectively became part of the hot side of the electrical wiring! Since I was reading an Agatha Christie mystery at the time, I wondered if couldn’t form the plot of a murder mystery.
The immediate problem was solved by replacing the offending outlet. By the time we left, however, the real problem of the useless grounding system had not been fixed. Long term problems are not something that get much attention here …