CPSI Entrapment and Protrusion Hazard Testing 2 — Questions and Answers
Question 1: According to ASTM F1487, what is the minimum opening size that begins the head entrapment hazard zone?
- 3.5 inches (88.9 mm) (Correct answer)
- 4.0 inches (101.6 mm)
- 5.0 inches (127.0 mm)
- 9.0 inches (228.6 mm)
Correct answer: 3.5 inches (88.9 mm)
Openings between 3.5 inches and 9 inches are considered the head entrapment zone because a child's head can enter but may not exit.
Question 2: What is the upper boundary of the head entrapment hazard zone per ASTM F1487?
- 7.0 inches (177.8 mm)
- 9.0 inches (228.6 mm) (Correct answer)
- 10.0 inches (254.0 mm)
- 12.0 inches (304.8 mm)
Correct answer: 9.0 inches (228.6 mm)
Openings 9 inches or larger allow a child's head to pass through completely without entrapment, so they are outside the hazard zone.
Question 3: Which ASTM standard is the primary reference for public playground equipment safety requirements including entrapment hazards?
- ASTM F1292
- ASTM F1951
- ASTM F1487 (Correct answer)
- ASTM F2373
Correct answer: ASTM F1487
ASTM F1487 is the Standard Consumer Safety Performance Specification for Playground Equipment for Public Use.
Question 4: When testing an angled opening for head entrapment, the probe must be inserted at what angle relative to the opening?
- At a 30-degree angle downward
- Perpendicular to the plane of the opening
- At a 45-degree angle
- In the most unfavorable angle that allows entry (Correct answer)
Correct answer: In the most unfavorable angle that allows entry
Inspectors must test openings at the most unfavorable angle to simulate a child's worst-case head-first entry scenario.
Question 5: An upper-body entrapment hazard exists when a child's torso can enter an opening but cannot:
- Slide down the structure
- Exit or withdraw from the opening (Correct answer)
- Touch the ground below
- Rotate 360 degrees inside
Correct answer: Exit or withdraw from the opening
Upper-body entrapment occurs when the torso enters but the child cannot reverse the entry due to body geometry differences between entry and exit.
Question 6: What is the minimum diameter of the head entrapment test probe (small headform) used in CPSC playground safety testing?
- 3.0 inches (76.2 mm)
- 3.5 inches (88.9 mm) (Correct answer)
- 4.0 inches (101.6 mm)
- 5.0 inches (127.0 mm)
Correct answer: 3.5 inches (88.9 mm)
The small headform probe is 3.5 inches in diameter, representing the smallest child head that might attempt to enter an opening.
Question 7: Which of the following opening shapes is MOST likely to create a head entrapment hazard even if initial measurements seem borderline?
- A perfectly circular opening of 9.5 inches diameter
- A V-shaped or wedge opening that narrows after the entry point (Correct answer)
- A square opening with all sides measuring 10 inches
- A rectangular opening wider than 9 inches on both dimensions
Correct answer: A V-shaped or wedge opening that narrows after the entry point
V-shaped or wedge openings are especially dangerous because entry is easy but the narrowing prevents the head from withdrawing.
CPSI Entrapment and Protrusion Hazard Testing 2
According to ASTM F1487, what is the minimum opening size that begins the head entrapment hazard zone?