Quote Originally Posted by Radu_Andrei View Post
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You are 3 meters away from the double power lines in the picture above? No way!!! There are regulations for a protection corridor of around 30-50 meters along the high voltage power lines. I hope you are not living near... For health reasons it is recommended a distance of 150-300 meters from the HV power lines.

Maybe those power lines are used only occasionally and coincides with the time your CNC starts going crazy. Are you hearing any hum under those lines?