Wiring Diagram of a Straight 220-Volt System in Which the Motor Load is Separated from the Lighting Circuits. Fig. 4. A 220- Volt A-C. System Adapted to a ... Assuming that 300-watt Mazda C lamps are to be used throughout, the problem will be figured on the basis of using either 110- or 200-volt lamps. (Table No. 2.)anbsp;...