SafetyCâu 513 / 700
A portable straight ladder is used to access a roof. Cal/OSHA and safe practice require it to extend approximately how far above the upper landing?
a.It must be exactly flush with the roof edge
b.About 3 feet above the landing surface
c.About 6 inches above the landing
d.It does not need to extend above the landing at all
Giải thích
A portable ladder used to reach an upper landing should extend about 3 feet above the landing so a worker has a secure handhold when stepping on and off. Option b is correct. A flush or 6-inch extension (a, c) gives nothing to grab, and no extension (d) makes the transition unsafe. The ladder should also be set at about a 4-to-1 pitch.
Trích dẫn luật: Cal/OSHA Title 8, Construction Safety OrdersLuyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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