STSC Cranes, Derricks, Hoists, and Rigging Safety 2

Question 1

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?

Accepted Answer

15 feet

Answer

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.

Question 2

What document must be on the crane at all times during operation?

Accepted Answer

Load charts and the equipment manual

Answer

Load charts and manufacturer's manuals must be in the cab and accessible to the operator at all times.

Question 3

A crane operator certification must be obtained from:

Accepted Answer

An accredited crane operator testing organization (e.g., NCCCO, NCCER)

Answer

OSHA 29 CFR 1926.1427 requires operators to be certified by an accredited crane operator testing organization.

Question 4

When rigging a load with multiple sling legs, the tension in each leg increases as the angle between the sling and the horizontal:

Accepted Answer

Decreases

Answer

As the sling angle from horizontal decreases (more horizontal), tension in each leg increases due to the de-rating effect.

Question 5

What must be done before lifting with any crane at the start of each shift?

Accepted Answer

Complete a pre-shift inspection by a competent person

Answer

OSHA requires a pre-shift inspection by a competent person before each shift of operation.

(STSC) Safety Trained Supervisor Construction Practice Test

(STSC) Safety Trained Supervisor Construction Practice Test

STSC Cranes, Derricks, Hoists, and Rigging Safety 2