I recently decided it's time to update my current setup in the garage. I currently have a NEMA 14-50R installed, wired directly to my main panel in the basement, into which I plug my UMC. Additionally, my garage has a single 120V outlet and two single light bulbs on the ceiling. Since these are both inadequate, I figured I would add a subpanel and run a dedicated circuit or two to supply additional outlets and lighting. So, while I'm at it, I might as well add a HPWC. I only have a single charger in my car, so 50A would be enough. However, if I am going to go to the trouble of adding a subpanel, I might as well run a big enough circuit to allow me to run an HPWC at 80A if I ever add another charger. I have read FlasherZ's FAQs and other posts about adding the subpanel. I plan to do the work myself but have it fully permitted and inspected. Before getting started, I thought I better do some load calculations to make sure my current 200A service is up to the task. I am using one of the online calculators (http://www.nojolt.com/load_calculations.shtml) but am a little unsure of a couple of things. 1. How are "lighting" and "small appliance" branch circuits defined? If I understand correctly, the lighting load is accounted for by the square footage of the dwelling. So, these circuits shouldn't be added to the total. However, "small appliance" circuits should. The problem is that my house's wiring has, shall we say, evolved over the years and there are many circuits that drive both overhead lighting and individual outlets in the same room. So, technically, nearly all of my circuits not accounted for elsewhere could be considered "small appliance" circuits. How should these be counted? 2. Under my current calculations, with my UMC at 40A, the load calculator says I need 245A service. As I mentioned before, I have 200A service. Everything is working fine. I have never had any voltage sags, my UMC never drops back to 30A no matter what else is running, and I have never tripped a breaker. From this, I assume my load is OK and I am doing my calculations incorrectly. Can anyone offer some tips on doing load calculations on an existing installation? I am starting to get familiar with the NFPA 70 but it is no small task to digest this thing. Any help would be appreciated!