Useful Variac Circuit

The circuit shown in the accompanying illustration will be found useful where a limited range of control is needed on a 230-volt, 3-wire circuit.

The range of control is from 11 5 to 230 volts, and the effective rating of the 115-volt Variac is doubled. Since the common wire in a 3-wire system is usually grounded, the load should not be grounded when this connection is used.

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