Hi, I find that SH3D is home design software and it is great for what it is designed to do. I use it as a hobby and it is great to try different builds.
However, I find that it is too cumbersome to try and complete a wiring schematic for a building using SH3D. Instead, though I place some items e.g airconditioning, I complete all the wiring design for a building using an electrical CAD program. A google search will turn up free programs which can be tried and can be used in association with a build.