However, if you are using this for "work" in a professional capacity, treat it as a primer, not a bible. Always cross-reference with local electrical codes and safety regulations. For the best experience, consider buying the official digital version to ensure the diagrams are clear and accurate—your safety is worth the small investment. Transangels 21 10 08 Izzy Wilde And Rubi Maxim Verified - 3.79.94.248