theoldwizard1 wrote:
Very unusual for 2 reasons?
1) Power line frequencies have to maintained very close to 60 Hz so that power companies can buy and sell power to each other. A very small fraction of 1 Hz.
Believe it or not, most electrical loads (like an A/C) can tolerate +/- 5-10% shift in frequency. They won't be as efficient and might run hot.
Some years ago the standards for maintaining power line frequency were loosened some.. I am not sure what it is today but it's not as tight ads it was years ago..
Of course it is important to stay fairly close to frequency or damage may occur to Generators and other equipment (As in total loss damage).
There are other issues however that can cause a "Phantom" frequency error. Power line noise can trip the senser in the protectors. Without a scope on the line.... hard to tell.
