Michigan Compiled Laws, Chapter 125. Planning, Housing and Zoning § 125.1521a

Sec. 21a. (1) Beginning 1 year after the effective date of the amendatory act that added this section, heating cable shall not be installed or used in a building or structure in this state until approved by the commission pursuant to section 21.  1 As provided in section 8,  2 this section is effective throughout the state without local modification.

(2) An application for approval of heating cable submitted to the commission, which includes listing by a nationally recognized testing laboratory found to comply with established standards, shall be approved unless the commission finds it would endanger the public safety.

(3) For purposes of this section, “heating cable” means heating cable as defined in section 2  3 of the heating cable safety act, that is, cable designed to be secured to pipes and vessels to reduce their likelihood of freezing or to facilitate the flow of viscous liquids. Heating cable also includes products used for deicing on roofs and in gutters and downspouts. Heating cable intended for industrial and commercial use is connected to the supply system by a permanent wiring method or by an attachment plug for connection to a receptacle outlet. Heating cable intended for residential and mobile home use has an attachment plug for connection to a receptacle outlet. Heating cable is commonly known as heat tape.

(4) This section shall not be construed to limit the powers and duties granted pursuant to any other law to a state agency or official.