A metal deck crew establishes a controlled decking zone while installing initial deck panels 24 ft above the lower level. What is the maximum CDZ size from any leading edge?
Correct Answer
C) 90 ft wide by 90 ft deep
OSHA 1926.760(c)(3) limits a controlled decking zone to not more than 90 ft wide and 90 ft deep from any leading edge. Other choices either shrink the permitted CDZ unnecessarily or exceed the OSHA maximum.
Why This Is the Correct Answer
OSHA 1926.760(c)(3) limits a controlled decking zone to not more than 90 ft wide and 90 ft deep from any leading edge. Other choices either shrink the permitted CDZ unnecessarily or exceed the OSHA maximum.
Why the Other Options Are Wrong
Option A: 30 ft wide by 30 ft deep
The trap in A is 30 ft wide by 30 ft deep. That selection is wrong because 30 ft wide by 30 ft deep is a different published number than the cited Controlled decking zone value; 29 CFR 1926.760(c)(3) supports 90 ft wide by 90 ft deep; A controlled decking zone is limited to 90 ft wide by 90 ft deep from a leading edge.
Option B: 60 ft wide by 60 ft deep
Choice B gives 60 ft wide by 60 ft deep. Its specific error: 60 ft wide by 60 ft deep is a different published number than the cited Controlled decking zone value; 29 CFR 1926.760(c)(3) supports 90 ft wide by 90 ft deep.
Option D: 150 ft wide by 150 ft deep
In metals work, 150 ft wide by 150 ft deep is the wrong selection for Controlled decking zone: 150 ft wide by 150 ft deep is a different published number than the cited Controlled decking zone value; 29 CFR 1926.760(c)(3) supports 90 ft wide by 90 ft deep.
Memory Technique
Make controlled decking zone a tabbed card: cite the exact condition, then choose 90 ft wide by 90 ft deep.
Reference Hint
Open 29 CFR Part 1926, Subpart R - Steel Erection; use 29 CFR 1926.760(c)(3) to confirm that OSHA 1926.760(c)(3) limits a controlled decking zone to not more than 90 ft wide and 90 ft deep from any leading edge.
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