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WES71ERN PUMP Petroleum & Lubrication Equipment Specialists Rope grab means a deceleration device which travels on a lifeline and automatically, by friction , engages the lifeline and locks so as to arrest the fall of an employee . A rope grab usually employs the principle of inertial locking , cam/level locking , or both . Roof means the exterior surface on the top of a building . This does not include floors or formwork which , because a building has not been completed , temporarily become the top surface of a building . Roofing work means the hoisting , storage , application , and removal of roofing materials and equipment, including related insulation , sheet metal , and vapor barrier work , but not including the construction of the roof deck. Safety Monitoring System means a safety system in which a competent person is responsible for recognizing and warning employees of fall hazards . Self-retracting lifeline/lanyard means a deceleration device containing a drum-wound line which can be slowly extracted from , or retracted onto , the drum under slight tension during normal employee movement, and which , after onset of a fall , automatically locks the drum and arrests the fall . Snaphook means a connector comprised of a hook-shaped member with a normally closed keeper, or similar arrangement, which may be opened to permit the hook to receive an object and , when released , automatically closes to retain the object. Snaphooks are generally one of two types . Steep roof means a roof having a slope greater than 4 in 12 (vertical to horizontal) . Toe board means a low protective barrier that will prevent the fall of materials and equipment to lower levels and provide protection from falls for personnel . Unprotected sides and edges means any side or edge (except at entrances to points of access) of a walking/working surface , e . g . , floor, roof, ramp , or runway where there is no wall or guardrail system at least 39 inches ( 1 . 0 m) high . Walking/working surface means any surface , whether horizontal or vertical on which an employee walks or works , including , but not limited to , floors , roofs , ramps , bridges , runways , formwork and concrete reinforcing steel but not including ladders , vehicles , or trailers , on which employees must be located in order to perform their job duties. Warning Line System means a barrier erected on a roof to warn employees that they are 3235 " F" Street, San Diego , CA 92102-3315 * 619-239-9988 Fax 619-239-9925 www.we ste rn pu m p. coin California Contractor's License #673853 California Certified Small Business #33547