Source google image: https://i.pinimg.com/736x/c9/7c/a1/c97ca1df3e1b3c5ee3d07fda57700064–electrical-installation-electrical-projects.jpg
Schema electrique useless box
Source google image: https://i.pinimg.com/736x/c9/7c/a1/c97ca1df3e1b3c5ee3d07fda57700064–electrical-installation-electrical-projects.jpg