Michigan Administrative Code › Department - Labor and Economic Opportunity › MIOSHA › General Industry and Construction Safety and Occupational Health Standards › Construction Safety and Health Standard › Part 29 - COMMUNICATION TOWERS › Section R. 408.42907 - Definitions

Current through Vol. 24-12, July 15, 2024
Rule 2907.
(1)
					 "Anti-two block device" means a positive acting device that prevents contact
					 between the load block or overhaul ball and the top block (two-blocking), or a
					 system that deactivates the hoisting action before damage occurs in the event
					 of a two-blocking situation.
(2)
					 "Authorized climber" means an individual with the physical capabilities to
					 climb; who may or may not have previous climbing experience; has been trained
					 in fall protection regulations, the equipment that applies to communication
					 structures work, and instruction for proper use of the equipment.
(3) "Boatswain chair" [bosun chair (seat)]
					 means a seat consisting of a board and a rope and any support where a person
					 can sit (especially the part of a chair or bench, or similar equipment on which
					 the person sits) for working at heights on structures.
(4) "Brakes" mean a mechanical or hydraulic
					 system that can decelerate or stop a load.
(5) "Catheads or capstans" mean a
					 spool-shaped metal mechanical device mounted on the end of a shaft around which
					 a rope is wrapped. A capstan is similar to a cathead but is mounted in the
					 vertical position.
(6) "Competent
					 person" means one who is capable of identifying existing and predictable
					 hazards in the surroundings or working conditions that are unsanitary,
					 hazardous, or dangerous to employees and who has authorization to take prompt
					 corrective measures to eliminate problems.
(7) "Crew chief/supervisor/foreman" means one
					 who is authorized and designated as competent and qualified by the
					 employer.
(8) "Crown block (top
					 block or load block)" means the sheave assembly used to change the direction of
					 the load line or jump line coming from the hoist and is attached at the
					 uppermost location of the structure for the project to lift loads.
(9) "Drum" means a cylindrical member with
					 flanges on each end around which rope is wound for lifting or lowering a
					 load.
(10) "Flemish eyes (Molly
					 Hogan)" means an eye splice made by using stranded cable and weaving them
					 together to make an eye.
(11) "Foot
					 block" means a block stationed at the base of a structure that allows the wire
					 rope to change direction 90 degrees to go up the structure.
(12) "Full body harness" means a body support
					 that is designed to contain the torso in such a manner that fall arrest forces
					 are distributed over at least the upper thighs, pelvis, chest, and
					 shoulders.
(13) "Gin pole" means a
					 device unique to the telecommunications industry used to raise successive
					 sections of tower steel, antennas, or equipment into position. This temporary
					 device allows headroom above the highest fixed point of the tower or
					 structure.
(14) "Gross load" means
					 the total load to be lifted. This includes the weight of the lifted object,
					 headache ball, the load line, tag line, and any other attachments.
(15) "Hoist mechanism or hoist" means the
					 complete unit including frame, prime mover (winch assembly), pumps, motors,
					 drums, and any associated equipment that is necessary to make the complete unit
					 work.
(16) "Hoisting" means the act
					 of lifting and lowering loads or personnel.
(17) "Load chart" means a chart used to
					 determine the lifting capacities under specified parameters and an
					 understanding of the working parameters within which the capacities are to be
					 used.
(18) "Load line" means a wire
					 rope of sufficient size and strength to raise the intended gross load
					 safely.
(19) "Maximum intended
					 personnel load/gross load" means the total load of all employees, tools,
					 materials, load lines, and other loads reasonably anticipated to be applied to
					 the hoist apparatus when an employee is hoisted.
(20) "Oil sample analysis" means a method
					 used to evaluate oil, which may not mean a laboratory analysis, but can be
					 effectively accomplished in the field by a qualified person.
(21) "One-hundred percent (100%) fall
					 protection" means each employee exposed to fall hazards above 6 feet while
					 ascending, descending, or moving point to point, must be protected by fall
					 protection, as described in
					 R
					 408.42910 Fall protection, at all times.
(22) "Operator" means a person who runs
					 (operates) equipment, such as winches, cranes, or hoists.
(23) "Pitch diameter" means the root diameter
					 of drum, lagging or sheave, plus the diameter of the rope.
(24) "Positive locking system" means a system
					 that creates a mechanical means of ensuring that the connection or interface
					 between 2 components will not slip.
(25) "Powered lowering" means the act of
					 controlled lowering of a load by the use of a system or device in the power
					 train, which can control the lowering speed of the winch assembly.
(26) "Prime mover" means the system that
					 provides the energy to rotate the winch assembly.
(27) "Proficient" means a thorough competence
					 derived from training and practice.
(28) "Proof test" means the act of testing
					 the rigging and hoist mechanism whenever newly rigged or after any changes are
					 made to the hoist mechanism or rigging.
(29) "Pulley" means a sheave wheel that is
					 grooved on the outer circumference to hold a wire rope in place while turning
					 and allows a mechanical advantage for lifting or a change in
					 direction.
(30) "Qualified person"
					 means a person who, by possession of a recognized degree, certificate, or
					 professional standing, or who by extensive knowledge, training, and experience,
					 has successfully demonstrated the ability to solve or resolve problems relating
					 to the subject matter, the work, or the project.
(31) "Rated capacity" means the load that a
					 winch assembly may handle under given operating conditions and at a known
					 design factor.
(32) "Rigging"
					 means, but is not limited to, chains, ropes, pulleys, hooks, and all
					 accompanying hardware for lifting, lowering, suspending, and fastening
					 loads.
(33) "Side plates" means the
					 side plates of sheaves or double plate attachment points that support the
					 sheave.
(34) "Similar structures"
					 means any structure that holds equipment relevant to the communication
					 industry.
(35) "Slings" means a
					 looped wire rope, strap, or chain for supporting, cradling, or lifting an
					 object.
(36) "Static brakes" means
					 brakes used once the motion of the drum has come to a complete stop to prevent
					 creeping or slippage. Static brakes are not necessarily separate from the
					 primary braking system or may be redundant in application. A locking device on
					 a primary braking system may be used.
(37) "Tag line and/or trolley line" means a
					 method or system of applying a force to control a load and having the ability
					 to create a space between the load and structure or gin pole.
(38) "Teardown inspection" means the complete
					 disassembly, cleaning, inspection, and replacement of all worn, cracked,
					 corroded or distorted parts such as pins, bearings, shafts, gears, brake
					 rotors, brake plates, drum, and base that may affect the operation of the winch
					 assembly.
(39) "Trial lift" means
					 testing a specified load weight from ground level to the location of where
					 personnel or equipment are to be hoisted.
(40) "Two blocking" means an unsafe condition
					 that occurs on a system when the overhaul ball, hook block, or headache ball on
					 the load line comes in contact with the main load sheave.
(41) "Winch assemblies" means a device with a
					 cylindrical drum with end flanges, shaft, shaft support, gears, and brakes used
					 to lift or lower items.