Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

Standard Operating Procedure Page 11 of 15 Fall Protection

5.6 WARNING LINE SYSTEMS

Warning line systems and their use shall comply with the following provisions:

• The warning line shall be erected around all sides of the roof work area. • When mechanical equipment is not being used, the warning line shall be erected not less than 6 feet (1.8 m) from the roof edge. • When mechanical equipment is being used, the warning line shall be erected not less than 6 feet (1.8 m) from the roof edge which is parallel to the direction of mechanical equipment operation, and not less than 10 feet (3.1m) from the roof edge which is perpendicular to the direction of mechanical equipment operation. • Points of access, materials handling areas, storage areas, and hoisting areas shall be connected to the work area by an access path formed by two warning lines. • When the path to a point of access is not in use, a rope, wire, chain, or other barricade, equivalent in strength and height to the warning line, shall be placed across the path at the point where the path intersects the warning line erected around the work area, or the path shall be offset such that a person cannot walk directly into the work area. • Warning lines shall consist of ropes, wires, or chains, and supporting stanchions erected as follows: • The rope, wire, or chain shall be flagged at not more than 6-foot (1.8 m) intervals with high-visibility material; • The rope, wire, or chain shall be rigged and supported in such a way that its lowest point (including sag) is no less than 34 inches (.9 m) fiom the walking/working surface and its highest point is no more than 39 inches (1.0 m) from the walking/working surface; • After being erected, with the rope, wire, or chain attached, stanchions shall be capable of resisting, without tipping over, a force of at least 16 pounds (71 N) applied horizontally against the stanchion, 30 inches (0.8 m) above the walking/woTking surface, perpendicular to the warning line, and in the direction of the floor, roof, or platform edge; • The rope, wire, or chain shall have a minimum tensile strength of 500 poimds (2.22 kN), and after being attach^ to the stanchions, shall be capable of supporting, without brewing, the loads applied to the stanchions described above; and • The line shall be attached at each stanchion in such a way that pulling on one section of the line between stanchions will not result in slack being taken up in adjacent sections before the stanchion tips over. • No employee shall be allowed in the area between a roof edge and a warning line unless the employee is performing roofing work in that area. • Mechanical equipment on roofs shall be used or stored only in areas where employees are protected by a warning line system, guardrail system, or personal fall arrest system.

5.7 CONTROLLED ACCESS ZONES

Controlled access zones and their use shall conform to the following provisions.

When used to control access to areas where leading edge and other operations are taking place, the controlled access zone shall be defined by a control line or by any other means that restricts access. When control lines are used, they shall be erected not less than 6 feet (1.8 m) nor more than 25 feet (7.7 m) from the unprotected or leading edge, except when erecting precast concrete members.

When erecting precast concrete members, the control line shall be erected not less than 6 feet (1.8 m) nor more than 60 feet (18 m) or half the length of the member being erected, whichever is less, from the leading edge. The control line shall extend along the entire length of the unprotected or leading edge and shall be approximately parallel to the unprotected or leading edge. The control line shall be connected on each side to a guardrail system or wall.

When used to control access to areas where overhand bricklaying and related work are taking place:

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