An toànCâu 454 / 521
A straight or extension ladder used to reach an upper landing must extend at least how far above the landing surface?
a.6 inches above the landing
b.1 foot above the landing
c.2 feet above the landing
d.3 feet above the landing
Giải thích
A ladder used for access to a landing must extend at least 3 feet above the landing (or be provided with grab rails) so the worker has a secure handhold when stepping on and off. 6 inches, 1 foot, or 2 feet does not give a safe handhold at the transition point.
Trích dẫn luật: Cal/OSHA Title 8 §3276Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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