Under Cal/OSHA fall protection requirements, at what height must guardrails be installed around floor openings in construction?
Correct Answer
D) Any height
Cal/OSHA requires guardrails around floor openings regardless of height to prevent falls into the opening.
Why This Is the Correct Answer
Cal/OSHA requires guardrails around floor openings at any height — there is no minimum height threshold. Unlike general fall protection requirements (which often trigger at 6 feet), floor openings present a unique hazard because a worker can fall into the opening regardless of how shallow it is. The 'any height' rule reflects the principle that an opening in the floor is dangerous at any depth.
Why the Other Options Are Wrong
Option A: 6 feet
6 feet is the federal OSHA general fall protection trigger for construction workers, but it applies to falls from elevated surfaces, not floor openings. For floor openings specifically, Cal/OSHA requires protection at any height.
Option B: 10 feet
10 feet has no basis as a guardrail threshold for floor openings in Cal/OSHA regulations. This number may appear in other contexts (e.g., excavation requirements) but does not apply here.
Option C: 4 feet
4 feet is the general industry (non-construction) OSHA fall protection threshold. In construction, federal OSHA uses 6 feet, and Cal/OSHA uses 'any height' for floor openings specifically.
Memory Technique
Floor opening = zero tolerance. 'Any hole in the floor needs a rail' — no height exception. Think of it as a different category from ledge/edge fall protection. A 1-inch deep hole is still a tripping hazard; a 2-foot deep hole can still injure. Any height = guardrail required.
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