§ 21.37. Sectional ladders.
(a) Sectional ladders over 31 feet in length shall not be used.
(b) The connection joint shall not be less than one foot and shall have a good fit without binding or unnecessary play. The grooved ends of the sections shall be reinforced with a metal plate of not less than No. 18 U.S. gauge properly secured on it and a rivet above the groove extending through the depth of the rail, or equivalent.
(c) The bottom and intermediate sections shall not exceed a length of 6 feet 5 inches. The top sections may not exceed a length of 9 feet.
(d) The minimum dimensions of side rails shall be as follows:
Length of Ladder
(feet)Thickness
(inches)Depth
(inches)Up to and including 21 1 1/8 2 3/4 Over 21, up to and including 31 1 1/8 3 1/8 (e) Sectional ladders may be made up either of sections having spreading sides so that the sections are not interchangeable in their position in the ladder, or of interchangeable sections with or without a top section having converging rails and a bottom section having flaring side rails. The top section having converging side rails shall have a width at the top of not less than 4 inches.
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