Since it is a 240V circuit, hence no Neutral is needed.įinally, the ground wire is connected to both the DPST switch green screw and the terminal box of the water heater. The L1 and L2 (brass screws are directly connected to the water heater. It clearly shows the common (dark screws) are connected to the 240V supply voltage via Hot 1 and Hot 2. The following wiring diagram shows a DPST (Double Pole, Single Throw) switch rated for 120V to 277V and fed-up by 240V 2-pole breaker is used to wire and control a water heater. A 120V AC water heater element can’t be used for 240 or 230V.Ĭontrolling of Water Heater using DPST Switch.A 240V AC water heater element can be connected to the 120V AC.
Wiring an on off switch manual#
Always use the proper wiring diagram according to the user manual provided by the manufacturers.
Safety switches are required in tankless water heaters, HVAC (heating, ventilation, and air conditioning), commercial water heaters or when the main circuit breaker box is not within sight. This way, the double pole acts as a safety switch as well. Only breaking a single line supply will work perfectly, but we are still able to use the double pole switch instead of single pole switch as it makes sure to turn the power off to the water heater. This way, both lines (hot or phase) wires are turned off by switch. In our case of 240V water heater, we have used a 30 amp double pole switch protected by a 30 amp circuit breaker form the main supply panel.
Controlling of Water Heater from Three Places using Two, 3-Way & Four Way SwitchĬontrolling of Water Heater using Single-Pole Switch.Controlling of Water Heater from Two Places using Two, 3-Way Switches.Controlling of Water Heater using DPST Switch.Controlling of Water Heater using Double Pole Switch.Controlling of Water Heater using Single-Pole Switch.