Section R. 408.41934 - Electric-powered toolsRule 1934.
(1) An electric-powered tool, such as a saw, drill motor, and router, shall be grounded. This requirement does not pertain to ungrounded electrical systems. Ground fault circuit interrupters shall be used with ungrounded electrical systems.(2) Subrule (1) of this rule does not apply to a double insulated electric power tool labeled with underwriters laboratory or other nationally recognized testing laboratory approval for double-insulated tools.(3) A portable, power-driven circular saw shall be equipped with a guard above and below the base plate or shoe. The upper guard shall cover the saw to the depth of the teeth, except for the minimum arc required to allow proper retraction and contact with the work. When the saw is withdrawn from the work, the lower guard shall return automatically and instantly to the covered position.(4) The trailing cord of a portable powered tool shall not be used to hoist or lower the tool.(5) A powered tool shall be disconnected from its power source when it is serviced or when the point of operation device is changed by a device or tool.(6) When not grounded or double-insulated, an electrically powered hand tool used for the installation of power transmission and distribution systems shall be connected to the power supply by means of an isolating transformer or other isolated power supply.Mich. Admin. Code R. 408.41934
1979 AC; 1989 AACS; 2013 AACS