GENERAL PROVISIONS
§ 21.1. Definitions.
The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise:
‘‘A’’ ladder or trestle ladder—Ladder that consists of two single ladders hinged at the top to form equal angles with the base.
Extension ladder—A ladder that consists of two or more sections traveling in guides or brackets so arranged that it may be adjusted to variable lengths.
Extension trestle ladder—A ladder that consists of an ‘‘A’’ or trestle ladder with an additional single ladder which is adjusted vertically and provided with a device to lock it into place.
Fire ladder—A ladder used exclusively for fire purposes, but it does not include equipment of organized fire departments.
Fixed ladder—A ladder which is substantially fastened to a structure in a permanent position.
Full working length—The length of the ladder extended in extension or sectional ladders and not the sum of the lengths of the individual sections.
Ladder—An appliance designed for use in ascending or descending at an angle with the horizontal, exceeding 50° usually consisting of two side pieces called side rails, joined at short intervals by cross pieces called steps.
Portable ladder—A ladder that may be used at various locations. This term includes single, extension, step, and trestle ladders.
Sectional ladder—A ladder consisting of two or more sections which when combined will function as a single ladder.
Side-rolling ladder—A ladder running or a guide rail, generally fastened to shelving, the plane of the ladder being also its line of motion.
Single or straight ladder—A ladder consisting of only one section.
Stepladder—A ladder which consists of self-supporting flat steps or treads.
Trolley ladder—A ladder running on or in a track, fastened overhead; the plane of the ladder being at right angles to the line of motion.
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