I have a strange problem with my CNC setup that I noticed by accident. I'm using the Keling KL-350-36 power supply to run my Keling 4030 drivers. I mounted everything in an old computer case. I have the 120v AC going into the power supply, large prong connected to neutral and small to the Live... like in this video....and i have 120V running through the outside of computer case (well the whole thing I figure)! If I connect a voltmeter (or myself ) to the case and to ground I measure 120V. I'm not sure how this is happening. I have a couple tiny screws in the side of the power supply to keep it in the case, maybe that's it. Anyway it's not safe and not right, any ideas? Thank. I'm definitely not good with electrical issues.