1926.500(b) Definitions 1926.501(b)(2) Leading Edges 1926.501(b)(3)  Hoist Areas 1926.501(b)(4)  Holes 1926.502(b) GuardrailSystems 1926.502 (b)(1), (2) &(14) Top edge height shall be 42” +/- 3” from walking/working level, and able to withstand 200 lbs. of force. Midrails shall be installed at a height midway between top edge and walking/working level, and able to withstand 150 lbs. of force. 1926.502 (b)(13) Guardrails at points of access shall be provided with gates or offset to that a person cannot walk directly into the hole. 1926.502(c) Safety Net Systems 1926.501(c)(8)&(9)  Safety Net Systems Minimum breaking strength for border rope webbing is 5,000 lbs. Connections shall be as strong as net components. Connections shall be spaced not more than 6 inches apart. 1926.502(d) Personal FallArrest Systems 1926.502(d)(12) & (15)  Anchorage Velocity    v = (2gh) v = Velocity, assuming no initial velocity g = Gravitational Constant of 32.2 ft/s h = Height of fall in feet Momentum Of Fall   M = mv M = Momentum in foot- pounds/second  m = Mass in pounds  v  = Velocity, assuming no initial velocity  Skull Fracture     2Eg       m      50 x 2 x 32.2             12      16.3 ft/sec E = Kinetic Energy g = Gravitational Constant m = Weight of an average human     head 1926.502(d)(16) & (17) Harnesses Limit maximum arresting force to 1,800 pounds. Rigged so that an employee cannot free fall more than 6 feet. Attachment point located in center of back near shoulder level. 1926.502(f) Warning LineSystems 1926.502(g) Controlled Access Zones 1926.502(g)(1)  Controlled Access Zones - Leading Edge  Extends parallel along the unprotected or leading edge. Control line connected to guardrail system or wall. Line situated not less than 6 feet nor more than 25 feet from edge. 1926.502(g)(1)  Controlled Access Zones - Leading Edge (cont’d)  Consists of ropes, wires, and tape with a minimum breaking strength of 200 lbs. and is  marked with high visibility materials at not more than 6 foot intervals. Stanchions rigged so that the lowest point is not less than 39 inches nor more than 45 inches. Control line erected not less than 6 feet nor more than 60 feet, or half the length of the member being erected, whichever is less, from the leading edge. Lines erected not less than 10 ft. nor more than 15 ft. from the working edge. Lines extended to enclose all employees performing overhand bricklaying and related work. Lines erected at each end to enclose zone. Only employees engaged in work permitted in zone. 1926.502(h) Safety Monitoring Systems 1926.502(i) Covers 1926.502 (i) Covers Capable of supporting twice the maximum axle load. Capable of supporting twice employee, equipment, and material weight. Secured to prevent accidental displacement. Color coded or marked with the word “HOLE” or “COVER”. 1926.502(j) Protection From Falling Objects 1926.502(j)(1),(2) & (3)  Toeboards Erected a sufficient distance to protect employees below. Able to withstand a force of 50 lbs. outward and downward. Minimum height of 3 and 1/2 inches with no more th

高处作业美国职业安全与健康管理局OSHA 29 CFR 1926.ppt