Core TradesCâu 55 / 700
Under Cal/OSHA rules, a trench that workers enter must be protected by shoring, sloping, or a shield system once its depth reaches at least:
a.5 feet
b.3 feet
c.8 feet
d.10 feet
Giải thích
Trenches 5 feet or deeper generally require a protective system unless made entirely in stable rock, because the risk of a fatal cave-in rises sharply with depth. 3 feet is below the trigger, and 8 or 10 feet overstate the threshold.
Trích dẫn luật: Cal/OSHA Title 8 (Excavations)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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