Many people assume that the mains frequency is exactly 50/60Hz, but in fact that is rarely true. Accuracy and stability of the mains frequency is an interesting topic to research. No two points on the grid will have exactly the same characteristics, so collecting data at your location can reveal some interesting findings. This is especially true if you have (or are interested in building) a mains-referenced clock. There are many industrial applications as well for such a project.
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