31 Dec '14, 6pm

This One May Come as a Shock to Some

Please don’t think you can make this safe by coating it in a non-conductive coating or placing a glass sheet over it. Doing so may remove its DC conductivity but does nothing to remove its AC conductivity. With an insulating coating it becomes a giant capacitor which of course is conductive to AC. Scenario – Switch Mode Power Supply unit with the circuit earth (largest surface area of circuit board) connected to negative of rectified mains voltage (this is common). This SMPSU then placed on coated copper surface perhaps even with a additional thin insulator. Copper then conducting AC component of rectified mains voltage. Now place your hand on the coated surface. Hand to coating to copper becomes plate to dielectric to plate of a capacitor. Result – electric shock or electrocution. Looks great but I could only rate this as safe for voltages up to 40 – 50 Volts AC MAX or 10...

Full article: http://hackaday.com/2014/12/31/this-one-may-come-as-a-sho...

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