Source google image: https://i.pinimg.com/474x/13/cb/45/13cb4585f7b911bd38a68150c38caf2f–electric-construction.jpg
Schema electrique l n
Source google image: https://i.pinimg.com/474x/13/cb/45/13cb4585f7b911bd38a68150c38caf2f–electric-construction.jpg