Travelers,<br/><br/>One of my ATS's was humming under the bed so I decided to replace them both with the Lyght LPT50BRD.<br/><br/>The olde ones are out and the new one for the inverter is installed but I am now wondering about using this ATS on the single 120V leg???<br/><br/>There is a warning inside the box cover that says "The transfer switch may not work if power is lost to one 250V hot...