A 3 phase electric water heater wiring diagram is an important tool that can help homeowners and electrical technicians safely install, maintain, and repair electric water heaters.. The wiring diagram for a three-phase water heater typically includes the following components: a main disconnect switch, line and load connections, heating elements, thermostats, and control circuits.
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Learn how to wire a 3 phase electric heater with a diagram and step-by-step instructions. Find out the proper connections and safety precautions to take.. Three-phase electric water heaters are typically wired in a Y configuration consisting of two lines at 240 volts with a neutral. The first line goes from the main power box, through an ammeter, then to one side of the heater. From there, the line goes to the breaker box which distributes power to the two hot wires (A and B) of the heater.