An toànCâu 358 / 360
A plumber sets a straight (extension) ladder to reach a roof to service a vent. How should the ladder be positioned for safe use?
a.At about a 4-to-1 pitch (1 foot out for every 4 feet of height) and extending at least 3 feet above the landing
b.Nearly vertical against the wall to save space
c.At a 1-to-1 angle for easy climbing
d.Leaning at any angle as long as someone holds it
Giải thích
Cal/OSHA ladder rules call for a non-self-supporting ladder to be set at about a 4:1 ratio, one foot of base out for every four feet of working height, and to extend at least 3 feet above the upper landing so the user has a handhold when stepping off. Too steep risks tipping backward; too shallow risks the base sliding out. The ladder must also be on firm, level footing and secured.
Trích dẫn luật: Cal/OSHA Title 8 §1675Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A plumber is replacing old galvanized and brass fixtures in a home built in the 1950s and notices old lead-based solder and possible lead pipe. What awareness does Cal/OSHA require?
- A plumber must cut into old cement pipe that may be asbestos-cement (transite). What is the correct precaution regarding asbestos?
- During a remodel, a plumber suspects material to be removed contains asbestos. Beyond wetting and work practices, what broader requirement often applies to asbestos removal in California?
- A plumbing crew works all day at a remote new-construction site with no permanent facilities. What sanitation must the employer provide under Cal/OSHA?
- A plumber must work at an elevated edge where guardrails are not feasible and uses a personal fall arrest system. What are the essential components of that system?
- A plumber must move a heavy cast-iron water heater and lengths of pipe across a jobsite. What is the safest material-handling practice?
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