Wiring:The iWave-R includes a patented universal voltage 24VAC to 240VAC enter ability. The black wire (marked ‘AC’ on label) is for 24VAC to 240VAC voltage enter. The white wire (marked ‘N’ to the label) is the neutral leg for 24VAC or 120VAC; or the other warm leg for 208/240VAC. https://npoauthority68901.laowaiblog.com/28034012/fascination-about-npo-authority