110 vac

[usinart]

Is it a good practice to take one phase of my single phase 220 vac to make my 110 vac for my contact of the contactor or it must be a external 110 vac input ?

[usinart]

file attatcment

[tblough]

You can, only if you also have a neutral, i.e. a 4-wire 240V service to the machine. If you only have a 3-wire service, two hots and ground, you should not use a single hot and ground to make 120V.

It's also important to keep your 120V loads balanced between the two hots. Optimally you want 1/2 of the 120V loads on each leg.

If you have a single large 120V load and do not want to run a separate 120V circuit, you should install a step-down transformer in the machine.

[richardb15]

If you have a single large 120V load and do not want to run a separate 120V circuit, you should install a step-down transformer in the machine.

If you are on a 240v single phase input supply then the above applies, you'll need to install a step down transformer. They are very common in Europe (I think you are there?) as any building site uses 110v tools via the yellow portable transformer boxes.

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[ShawnM]

As Tom stated, only if you have ALL 4 wires run from the panel. It's best practice to run all 4 wire for the exact reason you are asking. To be able to pull 110v from your 220v circuit. I do this all the time but I do run the entire CNC router and it's components on 220v for efficiency. Then I install a double gang duplex outlet on my machines so there are four 110v outlets for other tools need around a router like a sander, battery charger for battery powered tools or vacuum for clean up. Two outlets are on one leg and the other two on the other leg.