Over the last couple of weeks I've noticed significant time loss on two clocks in my kitchen, namely the microwave and the oven. Now, I think I have an explanation for this, but I want to know if anyone else has experienced this. Anyone in Cape Town noticing this kind of thing? Anyone elsewhere?
Clocks that run off mains power often use the frequency of the electricity grid (50Hz in South Africa) to keep time. If the electricity supply where to dip, or lose cycles, this could influence the accuracy of the clocks. If it was just a single clock, then I would just suspect that the device did not keep time well, but two separate appliances are losing exactly the same amount of time, which points to something else.
The time loss is a minor issue, but it does raise questions about the power quality and whether this is an issue which is internal (in my house) or external (on the grid).