What are the OSHA regulations for scaffold width, vertical tie distance, and foundation requirements?

here are the answers to your questions:

16. Above the first tie, scaffolds that are 3 feet (0.91m) wide and narrower can have a maximum vertical distance between ties of: [1926.451 (c) (1)(ii)]

    • According to OSHA 1926.451(c)(1)(ii), for scaffolds 3 feet (0.91 m) wide or less, ties should be repeated vertically every 20 feet (6.1 m).
    • The correct option is c).
    • c. 20 feet (6.1m)

17. Above the first tie, scaffolds that are wider than 3 feet (0.91m) can have a maximum vertical distance between ties of: [1926.451 (c) (1)(ii)]

    • OSHA 1926.451(c)(1)(ii) states that for scaffolds wider than 3 feet (0.91 m), ties should be repeated vertically every 26 feet (7.9 m).
    • The correct option is d).
    • d. 26 feet (7.92m)

18. When eccentric loads such as cantilevered platforms are applied or transmitted to a scaffold, the tipping forces must be compensated for by adding: [1926.451 (c) (1)(iii)]

    • OSHA 1926.451(c)(1)(iii) requires that tipping forces from eccentric loads be compensated for by the use of ties, guys, braces, or outriggers.
    • The correct option is a).
    • a. ties, guys, braces, or outriggers

19. Scaffolds shall bear on adequate firm foundations such as: [1926.451 (c) (2)]

    • OSHA 1926.451(c)(2) requires scaffolds to be erected on a firm, level, and plumb foundation. While not explicitly listing "base plates set on mudsills" as the only example, this is a standard and correct method to achieve a firm foundation, unlike the other unstable options.
    • The correct option is c).
    • c. base plates set on mudsills

20. Footings that scaffolds rest on shall be: [1926.451 (c) (2)(i)]

    • OSHA 1926.451(c)(2)(i) states that footings shall be level, sound, rigid, and capable of supporting the loaded scaffold without settling or displacement. Options a and b together cover these requirements.
    • The correct option is d).
    • d. both a and b