A perimeter column is being fabricated for a multistory steel frame. How far must it normally extend above the finished floor so perimeter safety cables can be installed before the next tier?
Correct Answer
D) 48 in.
OSHA 1926.756(e)(1) requires perimeter columns to extend a minimum of 48 in. above the finished floor to permit perimeter safety cables before erection of the next tier, except where constructibility does not allow. Other choices do not match the stated minimum.
Why This Is the Correct Answer
OSHA 1926.756(e)(1) requires perimeter columns to extend a minimum of 48 in. above the finished floor to permit perimeter safety cables before erection of the next tier, except where constructibility does not allow. Other choices do not match the stated minimum.
Why the Other Options Are Wrong
Option A: 24 in.
In metals work, 24 in. is the wrong selection for Perimeter columns: 24 in. is a different published number than the cited Perimeter columns value; 29 CFR 1926.756(e)(1) supports 48 in.
Option B: 30 in.
The trap in B is 30 in. That selection is wrong because 30 in. is a different published number than the cited Perimeter columns value; 29 CFR 1926.756(e)(1) supports 48 in.; Perimeter columns normally extend at least 48 in. above the finished floor.
Option C: 36 in.
Choice C gives 36 in. Its specific error: 36 in. is a different published number than the cited Perimeter columns value; 29 CFR 1926.756(e)(1) supports 48 in. The accepted answer is 48 in.
Memory Technique
Use a checkpoint memory cue for perimeter columns: the stem's condition unlocks 48 in.
Reference Hint
Open 29 CFR Part 1926, Subpart R - Steel Erection; use 29 CFR 1926.756(e)(1) to confirm that OSHA 1926.756(e)(1) requires perimeter columns to extend a minimum of 48 in.
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