An toànCâu 328 / 360
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?
a.Only because it is dark inside
b.Because it requires a locksmith to open
c.It has limited entry/exit and can contain a hazardous atmosphere such as toxic or oxygen-deficient gas
d.Because it is owned by the city rather than a private party
Giải thích
Under Title 8 §5157, a permit-required confined space is large enough to enter, has limited means of entry or exit, is not designed for continuous occupancy, and contains a recognized serious hazard such as a hazardous atmosphere or engulfment risk. Sewers and manholes commonly hold hydrogen sulfide, methane, and low oxygen, making them permit-required. A written permit, testing, and an attendant are required before entry.
Trích dẫn luật: Cal/OSHA Title 8 §5157Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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 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?
- 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?
- Testing a sewer manhole, the meter shows the flammable gas reading as a percentage of the Lower Explosive Limit (LEL). Below what LEL reading does Cal/OSHA generally consider the flammable atmosphere acceptable for entry?
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