Step down a NEMA L15-30R 90A 250v outlet to 110v

voltage

I just moved into a high-rise condo and on my patio I have an outlet labeled NEMA L15-30-R 90A 250V 30 and I'm trying to figure out what I can do with it.

I think the intended to be used for the window washers who come twice a year.

On my patio, I want to put a lot of electronics (kegerator, fridge, lights, electric heater, electric grill, etc), so is there a way I can get a 110v receptacle out of it?

I am not allowed to remove/replace the outlet, only plug into it.

Also, if you have any other important thoughts, please do tell.

It looks like this:
enter image description here

Best Answer

No. You can't use this for 120V power. The NEMA L15-30 receptacle is intended for 3-phase power applications. Most likely, it is a 208V three phase power outlet lacking neutral. Because there is no neutral, there is no easy or reliably safe way to get 120V power from it. Even if there were a neutral, it would be questionable whether it would be a good idea to apply a load to only 1 phase. There could be circuitry upstream designed to trip on unbalanced loading.

If you want to confirm that it really is a three-phase outlet, simply measure the voltages from phase to phase. This involves sticking voltmeter probes into the receptacle. There is a shock hazard doing this kind of thing, especially if you are using a cheap multi-meter. If you don't feel comfortable doing it, then don't do it. Please don't blame me if you get shocked.