Wiring:The iWave-R features a patented universal voltage 24VAC to 240VAC enter functionality. The black wire (marked ‘AC’ on label) is for 24VAC to 240VAC voltage input. The white wire (marked ‘N’ about the label) is the neutral leg for 24VAC or 120VAC; or one other scorching leg for 208/240VAC. https://dominickztjyo.blogadvize.com/35245638/donorsearch-for-dummies