There is a light switch just inside the back door. It services an overhead recessed fixture. When you come in from the garage, this switch is convenient for turning on the hallway light. There is only 1 switch servicing this light. It is in Box A. Box A contains 2 switches. I would like to set up another switch for this fixture farther out into the room. I would add this switch to Box B. Box B contains 1 switch. A second switch would be very useful because the overhead light illuminates the pantry and this small hallway, and there are times when you want light here without having to walk clear to the exit door. Looking at Box A, the switch controlling the overhead light is a single pole with 2 black wires. The other switch in the box controls the main overhead lights for the room; although this is a 3-way, there are no red wires on it. There are a total of 4 Romex wires in that box. Box B presently has only 1 switch; it controls an overhead fixture in the adjoining room. Is this enough information to tell me how the fixture is connected to the switch in Box A? And how to run a new wire to Box B to control the overhead fixture? [ATTACH]43172[/ATTACH]

I don't even know enough to be dangerous, so forgive the rather vague question..... We have leased a commercial space and we are planning the build out that needs to occur prior to getting the sub contractor quotes. We want to have a rough idea of what is practical before the quote stage. We are creating an area within the space that is going to be a kitchen area and will need all new circuits run for it. The main 600 AMP panel is quite a distance from where this needs to occur. Across the roof is (what was referred to by the owner as a 'bus'). It appears to have been a three phase supply with a series of boxes that machines were individually attached too with power drops. Is it possible to tap into this supply, convert it to single phase and power a sub panel from it? This would mean we wouldn't have to run significant amounts of wire to get power where we need it. I am assuming that IF it is possible, this would be a cheaper solution that wirig a supply line all the way to the sub panel location? I know this is vague, but generally speaking does it make sense? Thanks for humoring me!