Safety requirements for scaffolding in Standards - 29 CFR 16
To be continued:
"Tubular welded frame scaffolds."
1910.28(d)(1)
Metal tubular frame scaffolds, including accessories such as braces, brackets, trusses, screw legs, ladders, etc., shall be designed and proved to safely support four times the maximum intended load.
1910.28(d)(2)
Spacing of panels or frames shall be consistent with the loads imposed.
1910.28(d)(3)
Scaffolds shall be properly braced by cross bracing or diagonal braces, or both, for securing vertical members together laterally, and the cross braces shall be of such length as will automatically square and aline vertical members so that the erected scaffold is always plumb, square, and rigid. All brace connections shall be made secure.
1910.28(d)(4)
Scaffold legs shall be set on adjustable bases or plain bases placed on mud sills or other foundations adequate to support the maximum intended load.
1910.28(d)(5)
The frames shall be placed one on top of the other with coupling or stacking pins to provide proper vertical alinement of the legs.
1910.28(d)(6)
Where uplift may occur, panels shall be locked together vertically by pins or other equivalent suitable means.
1910.28(d)(7)
Guardrails not less than 2 x 4 inches or the equivalent and not less than 36 inches or more than 42 inches high, with a mid-rail, when required, of 1- x 4-inch lumber or equivalent, and toeboards, shall be installed at all open sides on all scaffolds more than 10 feet above the ground or floor. Toeboards shall be a minimum of 4 inches in height. Wire mesh shall be installed in accordance with paragraph (a)(17) of this section.
1910.28(d)(8)
All tubular metal scaffolds shall be constructed and erected to support four times the maximum intended loads.
1910.28(d)(9)
To prevent movement, the scaffold shall be secured to the building or structure at intervals not to exceed 30 feet horizontally and 26 feet vertically.
1910.28(d)(10)
Maximum permissible spans of planking shall be in conformity with paragraph (a)(9) of this section.