The brass screws should be connected to the Hot (line, live or phase) wire using the IEC & NEC Wire color codes.It is recommended to check the device rating or at least check using a multimeter in continuity test mode to verify the terminals. In addition, when the position of the 4-way switch is changed, it reverses both wires to opposite terminals and when the position of the double pole switch is changed, it turns both wires On or OFF. Keep in mind that double poles switches are rated for 220V to 240V while 4-Way switches are always rated for 120V to 277V. Double Pole & 4-Way Switches look similar but they are different.
#220 VOLT ON OFF SWITCH WIRING DIAGRAM HOW TO#
Read the Detailed Post about: How to Toggle Electric Water Heater Between 120V and 240V? The circuit is completed through Hot1 and Hot2 (via L 1 and L 2 are connected (through A 1, , A 2 and L 2 terminals). Switch lever at Down Position = Water heater runs on 240V supply.
Switch handle at Center Position = Switch OFF – No supply to the water heater.Switch lever at Up Position = Water heater operates on 120V supply as the circuit is completed through Line and Neutral (via B 1, L 1 and B 2, L 2 terminals).Just wire the double pole, double throw switch to the water heater as shown in fig below. In this case, we will need two breakers viz 30A, 2-Poles, 240V for hot1 and hot 2 and 20A, single pole, 120V for neutral and hot wires. “supply off”, we will use DPDT switch with center-off position. The above wiring diagram only switches the supply between 240V and 120V, to add an additional feature to the circuit e.g. Toggle Water Heater between 120V & 240V using DPDT Center-OFF Switch Keep in mind that you can control any of the two electrical appliances using double pole, double throw switch where one circuit can be operated at the same time while the second one will be OFF. When the switch position is down, the water heater runs on 120V supply via Hot 1 and Neutral. When the switch position is Up, the water heater operates on 240V via Hot 1 and Hot 2. The L1, A1 and B1 terminals screws are unused in this case.
Finally, connect the ground wire to the water heater. Now, connect a neutral from the busbar to the B2 terminal of the switch. Now connect Hot 1 (red color) from the breaker to the A2 terminal of the switch and again, connect the L2 terminal to the water heater terminal box. To do this, connect a Hot 1 (black color) from the 2-poles, 30 amp circuit breaker to the water heater element. How to Toggle Water Heater between 120V & 240V using DPDT Switch?Ī water heater can be toggled between 240V and 120V supply using a double pole, double throw switch. The L1 and L2 terminals are connected (not always the case) to the incoming lines (say Hot 1 and Hot 2 in case of 240V – NEC or Phase and Neutral in case of 120V or 230V – IEC) and A1, A1, B1 and B2 are connected to the load points according to the design.ĭouble Pole, Double Throw (DPDT) switch is used to control two separate appliances connected to the supply for example, a water heater can be toggled between 120V and 240V supply using DPDT switch (wiring diagram is given below), where both supply lines (Hot1 and Hot2 or Line and Neutral) must be switched ON or OFF at the same time for single operation as the action is interchangeable due to the DPDT switch. In short, DPDT (Double Pole, Double Throw) switch is used to control two separate circuit connected to two inputs supply.ĭouble Pole, Double Throw switch has 6 terminals as L1, L2, A1, A2, B1 and B2. It is basically two SPDT switches packed in a single unit and operated by a single lever (common for both single pole, double throw switches). What is Double Pole, Double Throw (DPDT) Switch?ĭPDT stands for Double Pole, Double Throw switch.
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