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Reply by Lazyman

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Posted on Do I Need a Neutral Line for a DC Motor?

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Lazyman

3046 posts in 1682 days


#1 posted 01-15-2017 11:39 PM

I’m not a an electrician but I think it is considered dangerous to use the ground as your neutral for your 120v add on. You could technically use the ground as your neutral and the motor would work but you risk electrifying the entire machine since the ground is there in case one of the 2 hot wires shorts out. If you hook your 120v motor to the ground and you happen to be standing in water when you touch the machine for example, you may become the path of least resistance to complete the circuit.

My understanding is that you either need a 220-to-120 transformer or you need a 4-wire cord and outlet with black/red hot wires, white neutral and ground. With that you could tap, one hot, a neutral and the ground to get a safe circuit. The other option is run a separate 120v, 3-wire cord to the motor.

Of course the most dangerous thing may be to take electrical advice from some random guy (like me)on the internet.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.


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