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Numérotation fil schéma électrique
Source google image: https://img.linuxfr.org/img/687474703a2f2f646f776e6c6f61642e74757866616d696c792e6f72672f7165742f666f72756d5f696d672f6373735f7374796c6536312e706e67/css_style61.png