Originally Posted by barry12345

Well the two legs voltages sound good and perhaps a little better than average. I have never had good reason to apply my scope to the power grid supply.

A noisy waveform may or may not create issues. Yet that depends on how much. Since this is beyond me I will check with someone that will really know tomorrow and post.

I was sitting here also wondering if the system was putting some form of carrier on their system that you might be seeing. The same people tomorrow will tell me if a waveform like you have would mislead the power meter in any way. I will of course post their answers.

Or if it has any other negative effects. At least the phase positions are good or you would not read 240 volts in your case across the two legs.

There is something that is disturbing me a little about this dirty supply as you describe it. I just cannot put my finger on it so to speak. Part of me wants to think it may be coming in on the neutral. You could see that as what you are seeing on the scope. The neutral is not a true ground.

Anyways better minds than myself will answer the questions tomorrow. Or perhaps a more knowledgeable member earlier.. The service is still grounded? That could filter the neutral perhaps to some extent. If visually grounded corrosion has not diminished the ground?