Hi fellas. I am currently installing a machine from China, it came to the US in about 30 crates, and complete with a Chinese electrician to "help" me install it. First, the chinese know nothing about conduit or wireway, he just wants to run wire across the floor to each motor. ...Now to my question: The voltage in the plant where we are installing this beast is 480Y 277 3 phase 4 wire, and one of the cabinets for controlling a scale needs 480v and 120v inputs. My Chinese helper has said thru his interpreter that in China he could grab one leg of the 480v and the Neutral and have 120v, he then drew it out like a star configuration. Question, is it possible to get 110v out of a 480v star system?
The Chinese helper may be wanting to do some temporary wiring as a test lash-up, to satisfy himself and the customer that the equipment did survive shipping and will in fact work. And after that, do a clean professional install. As an EE, I've been there is a sense (delivering and setting up electronic equipment at a customer site many moons ago.
Unless he meant to say "thru a transformer" you can't get 120V from a 480V Y or delta system. Oh, and China is a 50Hz country
. Hopefully, the factory had a 60Hz source, or the equipment won't care about it not being 50Hz and being 60Hz.