Редактирование: Guide to mapping (раздел)

=== Wiring ===
Make sure the wires lead from the main power grid, and to the APC(s) of your area. If any equipment in your new area requires a wire under it, line it up, connected to the main power grid, and under the machinery. 

Wires are also helpful when making electrical grilles (just dot wire under a grille), make sure the wires touch the main power grid (or they won't shock people).