Mich. Admin. Code R. 408.42907

Current through Vol. 24-21, December 1, 2024

Section R. 408.42907 - Definitions

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.

Mich. Admin. Code R. 408.42907

2009 AACS