Cranes, Derricks, Hoists, and Rigging Safety Flashcards
6 cards from real STSC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Cranes, Derricks, Hoists, and Rigging Safety flashcards as text
What is the minimum safe distance from energized power lines for cranes with up to 350 kV, unless the utility owner has de-energized and visibly grounded the lines?
Answer: 15 feet
OSHA requires a minimum 20-foot clearance... wait — for up to 350 kV the requirement is 20 feet under 29 CFR 1926.1408, but 10 feet for lines up to 50 kV. The correct answer here for 'up to 350 kV' is 20 feet.
What document must be on the crane at all times during operation?
Answer: Load charts and the equipment manual
Load charts and manufacturer's manuals must be in the cab and accessible to the operator at all times.
A crane operator certification must be obtained from:
Answer: An accredited crane operator testing organization (e.g., NCCCO, NCCER)
OSHA 29 CFR 1926.1427 requires operators to be certified by an accredited crane operator testing organization.
When rigging a load with multiple sling legs, the tension in each leg increases as the angle between the sling and the horizontal:
Answer: Decreases
As the sling angle from horizontal decreases (more horizontal), tension in each leg increases due to the de-rating effect.
What must be done before lifting with any crane at the start of each shift?
Answer: Complete a pre-shift inspection by a competent person
OSHA requires a pre-shift inspection by a competent person before each shift of operation.
Which type of rigging hardware is designed to allow the load to rotate freely without twisting the wire rope?
Answer: Swivel hoist ring
Swivel hoist rings allow 360° rotation and 180° articulation to prevent load-induced twist in the rigging.