Safety第 102 / 110 题
During sewer confined-space work, the attendant outside must maintain what capability?
a.Enter to help immediately without equipment
b.Continuous communication with entrants and the ability to summon rescue without entering
c.Leave to get tools as needed
d.Perform the plumbing work
解析
The attendant remains outside, keeps continuous communication with the entrants, monitors conditions, and summons trained rescue if needed, but does not enter the space to attempt rescue alone. Untrained would-be rescuers are a leading cause of confined-space fatalities. Non-entry retrieval systems allow rescue from outside.
法律依据: 29 CFR 1910.146免费刷完整 110 道题库 — 无需注册。
同考点相关题目
- A master plumber must braze medical gas copper, which is hot work. What fire-safety precaution is required before starting?
- A plumber replaces piping in a building constructed before 1978 and disturbs old painted surfaces and solder. What two legacy hazards require specific precautions?
- A 2,000 lb cast-iron section is lifted by a two-leg sling with each leg at 60 degrees from horizontal. Each leg carries (load / 2) / sin(60 degrees), with sin(60) about 0.866. What is the tension in each sling leg?
- A trench 10 ft deep in Type B soil is sloped at 1 to 1 (horizontal to vertical) on both sides. If the trench bottom is 3 ft wide, how wide is the excavation at the top?
- A trench 90 ft long and 6 ft deep requires egress so no worker travels more than 25 ft laterally to a ladder. A ladder placed mid-run protects 25 ft in each direction, or 50 ft total. What is the minimum number of ladders required?
- Before servicing a sewage ejector pump, the plumber must control hazardous energy. What procedure prevents the pump from starting during service?