An toànCâu 445 / 521
An excavation or trench that is how deep generally requires a protective system (sloping, shoring, or shielding) unless it is entirely in stable rock?
a.5 feet or deeper
b.10 feet or deeper
c.2 feet or deeper
d.20 feet or deeper
Giải thích
Trenches 5 feet deep or more must have a protective system (sloping/benching, shoring, or a trench shield) unless made entirely in stable rock. The 2-foot answer is too shallow, and waiting until 10 or 20 feet would leave workers unprotected in the depth range where fatal cave-ins commonly occur.
Trích dẫn luật: Cal/OSHA Title 8 §1541.1Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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