A hose is connected to a faucet and left submerged in a mop bucket of dirty water. What hazard does this create?
a.A gain for water conservation, since the bucket refills itself from the line that feeds the hose
b.A cross-connection that could allow backflow of contaminated water into the potable supply
c.A cosmetic housekeeping problem with no effect on the safety of the building's water supply
d.No hazard at all, because the pressure in the supply line pushes water outward and cannot reverse
Giải thích
A hose submerged in dirty water creates a cross-connection: if supply pressure drops, back-siphonage pulls the contaminated water backwards into the potable plumbing. Line pressure is not a guarantee, because a main break, a fire-hose draw, or heavy simultaneous demand is exactly what drops it, and nothing flows from the bucket back into the line while pressure holds, which is why the hazard is easy to miss. Hoses must never be left in standing water, and the connection needs a backflow preventer or an air gap.
Trích dẫn luật: FDA Food Code §5-402.11Luyện miễn phí toàn bộ 500 câu hỏi — không cần đăng ký.
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