(c) Tower cranes.
(d) Barge-mounted derricks or cranes.
(e) Gin poles.
(f) Gantry hoist systems.
A "come-a-long," that is, a mechanical device, usually consisting of a chain or cable
attached at each end, that is used to facilitate movement of materials through leverage is
not considered "hoisting equipment."
(11) "Leading edge" means the unprotected side and edge of a floor, roof, or
formwork for a floor or other walking/working surface, such as a deck, which changes
location as additional floor, roof, decking, or formwork sections are placed, formed, or
(12) "Metal decking" means a commercially manufactured, structural grade, cold-
rolled metal panel formed into a series of parallel ribs. As used in this part, the term
includes metal floor and roof decks, standing seam metal roofs, other metal roof systems,
and other products, such as bar gratings, checker plate, expanded metal panels, and
similar products. After installation and proper fastening, these decking materials serve a
combination of functions, including, but not limited to, any of the following:
(a) A structural element designed in combination with the structure to resist,
distribute, and transfer loads, stiffen the structure, and provide a diaphragm action.
(b) A walking/working surface.
(c) A form for concrete slabs.
(d) A support for roofing systems.
(e) A finished floor or roof.
(13) "Multiple lift rigging" means a rigging assembly manufactured by wire rope
rigging suppliers that facilitates the attachment of up to 5 independent loads to the hoist
rigging of a crane.
History: 2002 AACS; 2007 AACS; 2014 AACS.
R 408.42606 Definitions; O to U.
Rule 2606. (1) "Opening" means a gap or void 12 inches (30.5 cm) or more in its
least dimension in a floor, roof, or other walking/working surface.For the purposes of
this part, skylights and smoke domes that do not meet the strength requirements of R
408.42622(4), (5), (6), and (7) shall be regarded as openings.
(2) "Permanent floor" means a structurally completed floor at any
elevation, including slab on grade.
(3) "Personal fall arrest system" means a system used to arrest an employee in
a fall from a working level. A personal fall arrest system consists of an anchorage,
connectors, a body harness, and may include a lanyard, deceleration device,
lifeline, or suitable combination of these. The use of a body belt for fall arrest is
(4) "Plumbing up" means securing to obtain vertical alignment.
(5) "Positioning device system" means a body belt or body harness rigged to allow
an employee to be supported on an elevated, vertical surface, such as a wall or column,
and work with both hands free while leaning.