Good morning, This is my first post here and I have been viewing the site off and on and gaining some knowledge but I have a question I can not seem to find the answer to. My main problems is I need to add light in a dark hallway that has no power. I can add the light and connect to power easily enough the issue comes in with the switch. There is a switch in the area already but it is for a different room and I would like to just add a double switch and have them all in the same spot. Do I need to run wires just for the new light or is it possible to tie into the current run and control both lights separately? I am fairly new to this so apologies if this is covered elsewhere. I will also be adding some exterior outlets and have that down. But was wondering if I should just run the outdoor rated sheathed wire under the deck in conduit or leave it bare. Approximately 3 ft off the ground. Thanks for any info.

Hey everyone, First post here. I have just purchased an 8,000 square foot mixed-use residential/commercial building that my wife and I are moving into. It is two stories, with the upstairs having 2 condo-style apartments and the downstairs having commercial units, and it is in need of fairly significant work/upgrades/improvement. Each of the apartments used to be broken down into 2 very small units (i.e. there were 4 ~800 square foot apartments upstairs originally), and because of this, my current living space has 2 separate breaker boxes. Each box originally had an A/C unit, water heater, and then all of the other breakers for the usual house odds and ends (bathroom GFIs, lights and outlets, etc.); however, we now have one larger A/C unit and all of the kitchen appliances running off a single breaker box, while the other breaker box now only has 4 15 Amp breakers running our bedroom lights/fans and outlets, our library lights/fans and outlets, a bathroom GFI circuit, and a circuit for a jacuzzi bathtub. Because there were originally 2 apartments, there are two service connections from the utility company to each breaker box, meaning we will be paying two bills, and although we have not received our first bill yet, I am all but certain we will be using less than the minimum charge per day on the 2nd breaker box (because of the small number of things it runs and how much we are currently using them). For the sake of convenience, and money in the long term, I would like to eliminate one service, and have a single service running to the main box supplying the "big" appliances, and then turn the second box into a subpanel running from the main, thus eliminating having 2 bills, etc. Would that be something that is possible, assuming the right wiring/amperage is running to the "main" panel (which I have not had the chance to dive into yet, but will be doing so this weekend)? Obviously I know more details are probably needed, but I do not have them available just yet. I have done quite a bit of electrical work over the years, but it has mostly been fairly routine items, or something done from scratch (running an entirely new breaker box, service panel, etc.), and I have limited experience changing around already existing wiring systems. Thanks, and I will get any additional info as quickly as possible.