Section 408.10324. Rungs and cleats; length; design; diameter of metal rungs; construction of metal cleats; adoption by reference of standards for wood cleats and other wood components.

(1) The clear length of rungs and cleats shall be not less than 16 inches.

(2)   The rungs of an individual rung ladder shall be designed so that an employee's foot cannot slide off the end. See figure 1.

Figure for 408.10324

(3)   Metal rungs installed after November 15, 1971, shall have a diameter of not less than 3/4 of an inch and be constructed of steel rod or material of equivalent strength, except as provided in R 408.10341(1).

(4)   Metal cleats shall be made of steel or a material of equal strength and have a bearing surface that is not less than 1/2 of an inch.

(5)   Wood cleats and other wood components of a fixed ladder shall be as prescribed in ANSI standard A14.3-1984, fixed ladders, which is adopted by reference in these rules. The standard is available for inspection at the Lansing office of the department of labor. The standard may be purchased from the American National Standards Institute, 11 West 42nd Street, New York, New York 10036, or from the Michigan  Department of Labor, Safety Standards Division, 7150 Harris Drive, Box 30015, Lansing, Michigan 48909, at a cost as of the time of adoption of this rule of $13.00.

History: 1979 AC; 1994 AACS.