Before backfill begins, what setup ratio describes a non-self-supporting ladder?
Correct Answer
A) 1 ft out for every 4 ft of working length
1 ft out for every 4 ft of working length is the controlling requirement.1053(b)(5)(i). Other choices: the distractors are related-looking contract or field terms, but they do not match the cited requirement for review item 67.
Why This Is the Correct Answer
1 ft out for every 4 ft of working length is the controlling requirement.1053(b)(5)(i).
Why the Other Options Are Wrong
Option B: Apply the 1 ft out value that belongs to every 2 ft
The trap in B is 1 ft out for every 2 ft. That selection is wrong because 1 ft out for every 2 ft is not the OSHA ladder setup, extension, or access dimension cited here.
Option C: Select 1 ft out as if this were every 6 ft
Choice C gives 1 ft out for every 6 ft. Its specific error: 1 ft out for every 6 ft is not the OSHA ladder setup, extension, or access dimension cited here.
Option D: Apply vertical with no angle to the ladder angle condition
Choice D (Vertical with no angle) is rejected because it leaves out the controlling Ladder angle result.
Memory Technique
File ladder angle under a panel space: condition first, number or duty second, answer 1 ft out for every 4 ft of working length.
Reference Hint
Open 29 CFR 1926 OSHA Construction Standards; use 29 CFR 1926.1053(b)(5)(i) to confirm that 1 ft out for every 4 ft of working length is the controlling requirement.1053(b)(5)(i).
More NASCLA Questions
Bid instructions require bid security with each sealed bid. Which purpose should the estimator associate with that requirement?
A wood deck surface has 320 sf of coverage. Boards have a 5-1/2 in. actual face width, and the order includes an 8 percent cutting allowance. What linear footage is closest?
Using the dimensions shown for the stabilized construction entrance, what is the plan area?
A reroof area requires 14,720 sf of rigid insulation. Boards are 4 ft by 8 ft, and the order includes 5 percent waste. How many boards are needed?
Two addenda revise the drawings before bid day. What must a responsive bidder normally do with those addenda?
A utility trench is 180 ft long, 3 ft wide, and 7 ft deep with vertical sides inside a trench shield. What excavation volume is required?
A 120 ft long Type C trench is cut with a 4 ft bottom width and a 6 ft depth. If side slopes are 1-1/2 horizontal to 1 vertical, what excavation volume is closest?
A storm pipe run needs 240 ft of bedding, 4 ft wide and 6 in. thick. Including a 10 percent ordering allowance, how many cubic yards of bedding aggregate are needed?
A mass excavation produces 1,180 loose cubic yards of material for off-site disposal. End-dump trucks can haul 18 loose cubic yards per trip. What truck count is required?
An asphalt-shingle roof has a slope of 3:12. Under the IBC low-slope asphalt-shingle provisions, what underlayment arrangement is required?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass