Home Hot Water Heater Wiring. It is a very common practice to install a 102 Cable with a Ground Wire. Below are some steps you will follow.
Red color illustrates the Line or Phase wire and Black color shows the Neutral Wire in the above figures. Note that these element is 220 volts ratings and you can also 440 volts heater elements but you need to provide the line supply my mean to lines or two hot wires supply 440 volts. If the heater is used by drawing power from a normal wall socket the specified voltage will be 120 volts in the USA.
In the above diagram i shown that the upper water heater element is switched OFF and lower heater element is switch ON.
As long as your water heater is not too far from the panel it will be wired with 10 wire. Most hot water heaters are on a 30 amp two pole breaker. Assortment of atwood rv water heater wiring diagram. Before you begin use.