An toànCâu 327 / 360
A worker asks why a 5-foot trench needs protection when the walls 'look solid.' What fact best explains the danger of an unsupported trench wall?
a.Soil is very light, so a collapse is easy to climb out of
b.A cubic yard of soil can weigh over 2,000 to 3,000 pounds, enough to crush or suffocate a buried worker
c.Cave-ins only happen in trenches deeper than 15 feet
d.Soil never collapses if it has not rained recently
Giải thích
Soil is deceptively heavy; a single cubic yard can weigh as much as a small car (over 2,000 to 3,000 pounds). A worker buried even to the waist cannot self-rescue and can suffer crushing injuries or asphyxiation before help arrives. That weight is why §1541.1 protective systems exist, and why walls that 'look solid' are still deadly.
Trích dẫn luật: Cal/OSHA Title 8 §1541.1Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Cal/OSHA recognizes several methods of protecting workers from trench cave-ins. Which of the following is a recognized protective method?
- A trench that was safe yesterday saw heavy overnight rain. How often does Cal/OSHA require a competent person to inspect an excavation where workers will be exposed?
- Before a plumbing contractor begins excavating for a new sewer lateral, California law requires a step to avoid striking buried utilities. What must the contractor do?
- A plumber must enter a municipal sewer manhole to clear a blockage. Under Cal/OSHA §5157, why is this classified as a permit-required confined space?
- Before entering a sewer vault, a plumber lowers a multi-gas meter to test the atmosphere. In what order must the atmosphere be tested?
- A plumber's gas meter reads the oxygen level inside a sewer vault. What is the acceptable oxygen range for safe entry under Cal/OSHA?
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