Electrical - can I get 110V from a 220V circuit?

[Lilburner]

I know there are plug adapters, but I need to hardwire something.

I'm going to rework my pumphouse - new siding, new pressure switch, add a local spigot, etc.

Where it's situated would be a great place to have an electrical outlet. Anyone know what would be involved in tapping off the 220V to add an electrical outlet?

[RWS]

Most 240vac to well pumps is 2 hots and a ground.  There is not normally a neutral.  What I have done in a case like that was to put a transformer with 240 as the primary and 120Vac as the secondary.   Then you can get a hot, a neutral and a ground at 120vac.

It is real easy if there is a neutral to the pump house because all you have to do is tap 1 hot line and the neutral for your 120vac.  Hope that helps.

[nj_m715]

temporary or permanent?
you can get 110v by using a hot and your ground, won't meet code, but will work since neutrals and grounds connect to the same bus bar in the panel

I had a cheater cord, female extension cord with alligator clips, to get 110 from 220 rooftop hvac units back in my service days

[Lilburner]

OK. Thanks. I'll check it.

Neutral is four wire and no neutral is three wire if I recall. If there's no neutral, the transformer sounds like a safer bet. Definitely permanent. I need to shop for outdoor outlet enclosures - if that's crazy expensive, I'll put it inside. I'm positive I need GFCI regardless.

[Lilburner]

RWS, do you have a recommendation for a transformer? Everything I'm studying on pump houses only shows three wires coming in.
 
All of my transformer searches are coming up with plug-in adapters. I'm not using the right terminology or something.

[RWS]

There are many out there of various brands and prices.  So 120V x 15Amp= 1800 or 1.8kw.  So I would look for a 2KVA 240/120 transformer.

https://www.amazon.com/Acme-Electric-T253012S-Transformer-Isolation/dp/B007V6FHHW

The NEC requires a fuse sized for your transformer.  Primary fuse 2000/240= 8.33 so a 15 amp should work.  You could also fuse the secondary if you wish.  That would be 2000/120= 20 or 25 amp.

[RWS]

Several years ago I installed a solar system for a horse barn.  It is off grid and uses batteries to keep the well, lights & refrigerator running during a power outage.  Well several months after I finished and left I get a call.  The owner had an electric gate installed and it was not wired to the solar system.  That was unsatisfactory.  He asked could he power it from the pump power since is was right beside the pump house.  I told him to have the gate contractor change the voltage from 120 to 240VAC.  The control transformer in those things have a dual primary and will run on either.  Then rewire the motor for 240 as most of those small motors run on either.  Well he could not find anyone to make the changes basically because there was no neutral.  We finally installed a transformer and the gate is now solar powered/battery backed.