SafetyCâu 657 / 700
A ladder is stamped 'Type IA.' What MAXIMUM working load (duty rating) does this designation indicate?
a.250 pounds
b.300 pounds
c.225 pounds
d.375 pounds
Giải thích
Correct: Type IA is an extra-heavy-duty industrial ladder rated to 300 pounds. Type I (heavy duty) is 250 lb, Type II (medium) is 225 lb, and Type IAA (special heavy duty) is 375 lb. Selecting a ladder means matching its duty rating to the combined weight of the worker plus tools and materials.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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