There is no mechanism for your mains to have a frequency other that 50Hz with a < 1Hz variation. There is an absolute requirement the generators creating the power stay in the range and nothing between you and them that could shift ithe frequency.
I read it as the pump is broken, so that's why he's probing around and seeing the odd frequency reading.High frequency noise on the line may be causing your bogus meter readings.
I highly doubt that.
What makes you think that's what caused the failure?
Probably noise, not necessarily an open circuit. To get a proper measurement on a noisy circuit it would be best to use a low impedance meter. Either an analog meter or a DMM with low-Z modePerhaps one phase is open and he's seeing noise pickup (but no power). Or is this a 3 phase circuit?
Pump broken, then I tried to investigate source of the problem I saw the frequency was unstableI read it as the pump is broken, so that's why he's probing around and seeing the odd frequency reading.
If the circuit has failed open, perhaps he's seeing an artifact such as EM from fluorescent lights.
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by Jake Hertz
by Jake Hertz