R 408.13731 Tags generally.

Rule 3731. (1) An accident prevention tag shall be used as a temporary means of warning an employee of an existing hazard, such as defective tools or equipment. A tag shall not be used in place of an accident prevention sign or considered a complete warning method. (2) A tag shall be affixed by string, wire, or adhesive. (3) A tag shall be large enough to attract attention to the hazard, with the minimum letter size for the signal word in perspective to a safe viewing distance in accordance with R 408.13708. (4) The signal word shall be in bolt type. (5) There shall be no variation in the type of design of tags posted or hung to warn of a specific hazard. (6) A tag shall be protected or be of such material to last and maintain legibility during the assignment of the tag. (7) Tags shall be used as a means to prevent accidental injury or illness to employees who are exposed to hazardous or potentially hazardous conditions, equipment, or operations and which are out of the ordinary, unexpected, or not readily apparent. (8) Tags shall be used until such time as the identified hazard is eliminated or the hazardous operation is completed. (9) Tags need not be used where signs, guarding, or other positive means of protection are being used.