John Reiss asks:
I have a 220v well away from my house. The water softener need a 110 volt source to power it. How can I wire 110v off of the 220v pump switch?
Answer:
You cant! The 200v pump circuit is probably 2 hot wires and a ground. The 110v circuit requires 1 hot wire, 1 neutral wire and 1 ground wire. You cant tap 110v off of a 220v circuit without overcurrent protection. The 220v breaker will probably never trip if there is a problem with the 110v line. You also need to be concerned about overloading the circuit by adding the water softener.
If you have 2 hots (BL and RD), 1 neutral and 1 ground and adding the water softener wont overload (the circuit), then use the pump circuit to supply power to a sub-panel ahead of the pump and switch. Then use the correct size breaker to re-feed the pump and install a new single pole breaker for your 110v circuit.
If you do not have a neutral or the water softener will overload the circuit, then you need to install a new, dedicated 110v circuit.