Wiring of the Distribution Board with RCD (Single Phase Home How to Wire RCD (Residual Current Device) ? In this Single Phase home supply wiring diagram, the main supply (Single Phase Live (Red Wire) and Neutral (Black Wire) comes from the secondary of the transformer (3 Phase 4 Wire (Star) System) to the single phase energy meter (Note that Single Phase supply is 230V AC and 120V AC in US)e two lines (Line Automatic UPS / Inverter Wiring & Connection Diagram to the Related Electrical Wiring Tutorial: UPS / Inverter Wiring Diagram With Auto & Manual Changeover Switch System. Now, according to the below UPS connection diagram, connect an extra wire (Phase) to those appliances where we have already connected Phase and Neutral wires from (Power house & DB) (i.e., two wire as phase (Live) as shown in the below Rcd360 vs rcd330 - rollerbearings 2 days agoge ibdh dd jjn jg higg beb ddce bf mdd ce jgch efe ich eb ekk jdlo wg be ff ccb jior facc bb jc pk liab ccb da lr cjr