An toànCâu 329 / 360
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.Toxic gases, then flammable, then oxygen
b.Flammable, then oxygen, then toxic
c.Order does not matter as long as all three are tested
d.Oxygen first, then flammable gases/vapors, then toxic gases
Giải thích
Under Title 8 §5157, atmospheric testing must follow the sequence oxygen first, then flammable gases and vapors, then toxic gases and vapors. Oxygen is tested first because most combustible-gas sensors need adequate oxygen to read accurately. Testing in this order ensures each reading is valid before entry, and testing must continue or be monitored during occupancy.
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
- 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?
- 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 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?
- During a permit-required confined space entry into a sewer, Cal/OSHA requires an attendant. What is the attendant's primary role?
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