Shabin Electrical Part 1

As mentioned in the last post, I was able to spend an entire weekend working on the shabin. I got enough done to warrant two posts. After finishing the loft railings, I got to work wiring the shabin for electric. My original plan was to wire the cabin for 12 volt DC power. The shabin will be off-grid, so the idea was to store power in large batteries, much like an RV.  As I got closer to actually doing the electrics, I switched to 110 volt AC. Technically, 12V power is more efficient for battery power, since the electricity is not converted. However, there are significant drawbacks. Because of the lower voltage, the current, measured in amperes, is higher. The higher current also larger energy loss over distance, which is dissipated as heat, not a good thing.  To alleviate that requires thicker and more expensive wiring.  Additionally, 12v fixtures, form switches to light bulbs, are specialized and more expensive. Finally, there is very little literature available on the best ways to wire 12v.

On the other hand, AC power is ubiquitous and all the necessary parts are cheap and plentiful commodities, and the knowledge on proper techniques is common and freely available.  AC is much more appropriate for moving power over longer distances than DC, which requires thicker and thicker wire as the distance increases. Therefore, AC allows me to move the batteries outside of the cabin.  The approach I took was to treat the shabin as one big AC appliance that I plug in. So, I ended up going with common household AC wiring



And here is the plug. This was the only unusual component I used, a 15-amp 110v AC inlet (inlet being the opposite of outlet, of course.) This was the one item I needed to order online. With this approach, I am free to use any power source, generator/solar/wind/grid, as long as it is converted to AC and has a power cord.



The rest of the electrics are standard, starting with the breaker box, which is where the power flows to first  from the inlet. I have done home wiring in the past, but this is the first time I had wired a breaker box. It was a bit daunting, but I read up on it and it turned out to be easy.  Typically, the most dangerous thing about the breaker box is the always-on high power line coming in from the grid. In my case, I was assuredly safe as long as I did not plug in the inlet while I worked.



Victory!  This was the first outlet I wired.  It is just below the breaker box. I plugged my gas generator into the inlet, and the circuit tester plugged in to the outlet lit up just as it should. That was a good feeling.



That good feeling was tempered when I nicked my finger with a knife shortly after this success. This would not be notable, expect that I forgot to pack the first aid kit. Lacking real band aids, I had to kludge together a paper towel and duct tape.



I continued to wire the rest of the cabin on Sunday. Since I want to insulate the walls, I ran the wires on the inside edge of the framing members.  This is done by snapping a two chalk lines one inch apart along all the studs of a wall.



I used my circular saw to cut 1/2 inch deep grooves at each chalk mark, and then used a chisel to create a notch in each stud. The wire is run and secured in the notches.



The wires are protected from penetration from future nails or screws which metal plates.



By the time I left on Sunday, I had wired in all the outlets, the bathroom light, and the loft lights as shown above. I had to stop when I ran out of wiring, so on the next trip I can finish the minor remaining tasks of wiring the kitchen overhead light and the living area ceiling fan.

Shabin Loft Railing

I went up to the shabin this past weekend by myself, while Lizz entertained an out of town guest. This afforded me two full days of work, and much was accomplished. The first thing I did Saturday morning was to finish the cable railings for the loft. As shown above, there are two railings.  Twelve cables run the width of the loft and protect the opening to the living area below.



Since the stairs run up through an opening in the loft floor, I wanted to prevent accidental falls into the stair well. For that, I ran cables perpendicular to the ceiling, which is set at 45 degrees. The cables also have the effect of eliminating the bounce originally present along the open end of the loft.



Here is the view down the stairs.  I think the railings turned out quite snazzy.

Loft Railing

We made a quick day trip up to the camp yesterday. The main purpose of the trip was to deliver our new sleeper sofa. When I designed the shabin, I used an IKEA sofa as a reference for the living area furniture. I assumed we would buy the Ektorp corner sofa with a pull out bed. A corner sofa would provide the maximum amount of seating in a small area. A pull out bed would give us the second sleeping area we needed. Given the small proportions of the shabin, and the tight tolerances for things like loft stairs, the exact size of the sofa became critical. I was quite dismayed when I recently went to order the sofa and learned it had been discontinued.



Craigslist came through, however. I found this beauty for sale less than a mile from home, and it only ran me $100. The left side pulls out into a full size bed, and the right side is an ultra comfortable chaise lounge. Lizz claims it is the most comfortable piece of furniture we own. The sofa is in pretty good condition. The fabric is a bit faded but sturdy and the pattern is not something we would not have chosen for ourselves. In other words, it is perfect for a cabin in the woods.



Here we see the tight tolerance between the couch and the loft stairs. While we were up there, I also started on safety railings for the loft. I decided to use steel cables for the railings. Cables would be strong and the least obtrusive with regards to light and air movement. I also figured that they would look pretty cool. I purchased most of the materials from E-Rigging, who I will say were extremely quick fulfilling my order and much cheaper than buying from Lowes.



The first step was to carefully measure all the mount points for the cables. That was a bit time consuming. Since everything up in the loft runs at an angle, I got to use my 9th grade geometry, go Pythagoras! I spaced the cables 3 1/2 inches apart, with the top cable 42 inches above the loft floor. For the cable mount points, I used #0 size lag screws with eyes as shown in the picture.



In order to maintain tension in the cables, I used large (3/8") turnbuckles rated at 2000 lbs. These have shackles on one end whose bolts are slipped through the lag screw eyes.



I used 1/8" uncoated steel cable rated at 2000 lbs. Each cable is looped through the eye end of a turnbuckle, and secured with two screw down clips.  The other end is secured in the same way on the matching eye screw. Once secured, the cable is tightened by adjusting the turnbuckle. I used galvanized steel for all the hardware, which should be perfectly fine for interior use, and is a huge savings over using stainless steel.



I think these are turning going to look great. This was just a quick day trip, so I did not have enough time to finish. I finished 8 of the 12 cables for the loft opening. I will also install a set of cables along the side of the stair opening to prevent falling in the hole from the other side.