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While my layout is indoors (55ft by 26ft), I do use block wiring for my layout. I am using #14 household wiring to run the power to each block. This is to insure there is no voltage drop over the length of the run of the wire. My power source is 2 MRC Control Master 20 power packs. They are setup as Cab A and Cab B. I have 32 blocks on the entire layout.I used the Atlas wiring book for my many layouts over the years. Since I am indoors and moisture is not a problem for me. I use Atlas selectors for my control of my blocks. I do not use the rail clamps or solder all joints of my sectional track. The longest piece of track is 2 ft. All wire feeds to my blocks are soldered to the under side of one rail joiner only. You just make sure it is the same rail throughout the layout. My primary wire feed to both rails is done at "one place" only.This wiring practice has worked for me in both HO and now in G scale. The present layout has been up and running for 5 years now and no problems. I am not sure what I do inside would work for you outside, if you are building your layout on the ground. There are outdoor layouts that are built on benchwork and above the ground. This elevated practice is slowly catching on as we modelers get older. It is easier to stand than get down on one's hands and knees.
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