"So, in the current setup or as I have diagramed above still maintaining a single circuit, is this system inadequately grounded?" As a single circuit, it is presumably grounded just fine, as long as there is a proper grounding electrode system back at the main house panel. "I had assumed the circuit being fed consisted of a live, neutral and ground (the twisted bare). " As it is set up at the current time, that is correct, but it wasn't originally wired that way when the actual wire was installed. They didn't DO ground wires back then, and a "bare wire" does not infer that it is a ground wire, just not "ungrounded" (HOT). That is a cable with a concentric neutral. I doubt that either of the insulated wires are "identified" as a neutral (white insulation). "200.2 (A) Insulation. The grounded conductor (neutral), WHERE INSULATED, shall have insulation that is (1) suitable, other than color, for any ungrounded conductor of the same circuit on....." "200 .6 Means of Identifying Grounded Conductors. (A) Sizes 6 AWG or Smaller. An INSULATED grounded conductor (neutral) of 6 AWG or smaller shall be identified by a continuous white or gray outer finish or by three continuous white stripes on other than green insulation along its entire length. Wires that have their outer covering finished to show a white or gray color but have colored tracer...." "Regarding the disconnect... " This depends on the final decision of how you wire it. As it is wired right now, you would only need a standard toggle switch (just like the ones that turn on the lights). If you make it 2 circuits, you may only need 2 standard toggle switches, (just like I cut and pasted them out of your original drawing). You really only need something that looks more industrial if you need to install over current devices. Do you know what the actual wire gauge of the cable going from the house to the garage is? Back then, a common thing to do was to put a dryer receptacle in the garage. (Funny enough, I just noticed that there is a documentary on the outlawing of clothes lines in many parts of the country when the dryer became popular.) In other words, that may have originally been a 30 amp wire and a gas line to make provisions for either type of clothes dryer.

I agree, make the garage siding the same as the colour of house (redish bricks) and use white trims, soffit and eaves trough for accents. Garage door colours would look nice with white. Keep the garage consistent to the house. Please feel free to comment on my post for garage door colours listed around Aug 12. thanks!

Thanks Millworkman. It does not need to be fiberglass. It'll ultimately be painted black or a dark color. I'll check into the lumber yard. From my early research, the solid wood doors look to be at least double the cost which I'm trying to avoid for a what would be the garage storage door. Found this for the side entry door: link The other door is a double door to the garage storage area. Two 24" doors.

If it is simply a matter of paint color on the sash or frames, don't worry; you can always change it if you don't like it. However, if you are talking about altering the shape of the whole window openings... well, then it would not look so great. Good luck finding the solution that appeals to you and preserves the character of your historic property.