An toànCâu 1257 / 1605
The top edge of a standard guardrail top rail must be approximately what height above the walking/working surface?
a.60 inches
b.30 inches
c.21 inches
d.42 inches (plus or minus 3 inches)
Giải thích
1926.502(b)(1) sets the guardrail top edge at 42 inches, plus or minus 3 inches, above the walking/working level. A midrail is installed when there is no wall/parapet at least 21 inches high.
Trích dẫn luật: 29 CFR 1926.502(b)(1)Luyện miễn phí toàn bộ 1605 câu hỏi — không cần đăng ký.
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