Heater Specifications

Single-phase wire has three wires located within the insulation. Two hot wires and one neutral wire provide the power. Each hot wire provides 120 volts of electricity.

The neutral is tapped off from the transformer. A two-phase circuit probably exists because most water heaters, stoves and clothes dryers require 240 volts to operate.

These circuits are fed by both hot wires, but this is just a full phase circuit from a single-phase wire. Every other appliance is operated off of 120 volts of electricity, which is only using one hot wire and the neutral.

The type of circuit using hot and neutral wires is why it is commonly called a split-phase circuit. The single-phase wire has the two hot wires surrounded by black and red insulation, the neutral is always white and there is a green grounding wire.

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