480/277 volt 3 phase power is the proposed electrical service for a for a new building. Will I be able to power machinery that requires 230 volt 3 phase?

The dimmer for a ceiling light/fan combo in the bedroom stopped working. When trying to replace it with an electronic dimmer swich, nothing would work, so I measured voltage from the wires in the box. I had 122V from black to black but 81V from red to black. What would cause such disparity? ...

I am trying to hook up a commercial espresso machine which has a 220 line. My existing electrical box is a 3 phase 208 volt/120 volt. Would this be sufficient to handle this?? Thank you

We've switched to a central air conditioning system and no longer need the 240 volt outlet by the dining room window. The house was built in 1928, updated in 1957, and again a couple of ad hoc times thereafter. The wiring is at times very old, brand new or somewhat old. My guess is that the 240...