OSHA 10-Hour Construction ReviewTools - Hand and PowerEasy
A worker is operating a portable circular saw. According to OSHA standards, what type of guard is required for the lower portion of the blade?
- AA transparent guard that allows full visibility of the blade during cutting.
- BAn automatic self-returning guard that covers the blade when not in use.
- CA manually-operated guard that must be held open by the operator.
- DA fixed guard that can be manually retracted for cutting.
Show answer & explanationAnswer & explanation
Correct answer: B. An automatic self-returning guard that covers the blade when not in use.
OSHA requires that the lower guard of a portable circular saw must automatically and instantly return to the covering position when the saw is withdrawn from the work, providing continuous protection.
Why the other options are wrong
- A. While visibility is helpful, the primary requirement is for the guard to be automatic and self-returning, not just transparent.
- C. A manually-operated guard held open by the operator is unsafe as it requires constant attention and can be released accidentally.
- D. A fixed guard that must be manually retracted defeats the purpose of automatic protection.
Portable Circular Saw Lower Guard
The lower blade guard on a portable circular saw must be an automatic, self-returning type that covers the blade when the tool is not cutting, ensuring protection against accidental contact.
- Guard must be automatic and self-returning.
- Covers blade when saw is withdrawn from work.
- Prevents accidental contact with blade.
Memory trick: Blade goes in, guard goes out, safety's what it's all about.