Section R. 408.41730 - Circuit protectionRule 1730.
(1) Circuit protection shall be provided by fuses or circuit breakers for each feeder and branch circuit and shall be based on the current carrying capacity of the conductors and power load.(2) A fuse puller shall be used to install or remove a cartridge fuse when 1 or more terminals are energized.(3) A circuit protection device shall not be placed in a grounded circuit except where the device simultaneously opens both the ground and energized circuit.(4) Circuit protection in existing installations shall not be changed to increase the load in excess of the load rating of the conductor or equipment.Mich. Admin. Code R. 408.41730