The Michigan Electrical Code includes licensing requirements for electrical inspectors, electricians and contractors and mandates prior permitting for adding, altering or changing a building's electrical conductors or equipment. Michigan's electrical code includes requirements that bonding jumpers must be wires, buses, screws or other suitable conductors made of copper or another corrosion-resistant material. Specifications dealing with protection against corrosion and deterioration require protective coating of all ferrous metal equipment and allow the use of enamel-protected equipment only in dry, indoor locations.
The code authorizes use of a variety of types of equipment ground conductors including copper, aluminum or copper-clad aluminum, rigid metal, electrical or flexible metallic tubing. The electrical code also specifies that professionals may use an insulating-type bushing instead of a box or terminal where conductors exit a raceway or end at equipment. Michigan's electrical code covers the use, installation and construction of nonmetallic underground conduit with conductors and, with certain exceptions, specifies that each service drop, set of overhead or underground conductors or service lateral will supply one set of service-entrance conductors. The code further requires the provision of a grounded circuit conductor at the switch location for a controlled lighting circuit.
The Michigan Electrical Code, Part 8 of the state's Construction Code, incorporates the 2014 National Electrical Code and Michigan Part-8 Amendments. It covers all electrical installations, with the exception of one- and two-family dwellings, which the Michigan Residential Code covers.