CSS - Certified Safety Supervisor Ergonomics and Confined Space Safety Questions and Answers Flashcards
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Under OSHA 29 CFR 1910.146, what defines a 'permit-required confined space'?
Answer: A space that contains or has potential for a hazardous atmosphere, engulfment, or other recognized serious safety hazard
A permit-required confined space has limited entry/exit and contains or could contain a serious health or safety hazard such as a hazardous atmosphere or engulfment potential.
What is the minimum oxygen concentration considered acceptable in a confined space atmosphere per OSHA standards?
Answer: 19.5%
OSHA defines oxygen-deficient atmospheres as those with less than 19.5% oxygen; concentrations below this level require supplied-air respirators.
Which ergonomic risk factor is most associated with cumulative trauma disorders (CTDs) of the upper extremities?
Answer: High repetition combined with forceful exertions
Cumulative trauma disorders are most strongly associated with the combination of high repetition and forceful exertions acting on tendons, muscles, and joints.
The Waters equation (NIOSH Lifting Equation) calculates which value to guide safe manual lifting?
Answer: Recommended Weight Limit (RWL)
The NIOSH Lifting Equation outputs a Recommended Weight Limit (RWL) that, when compared to the actual load, produces the Lifting Index.
What is the role of an 'attendant' in a confined space entry operation under 29 CFR 1910.146?
Answer: To remain outside, track authorized entrants, and initiate rescue if needed
The attendant remains outside the permit space, maintains communication with entrants, monitors for hazards, and initiates rescue procedures without entering.
Which condition would trigger non-entry rescue rather than entry rescue for a confined space?
Answer: Entrant becomes incapacitated in an IDLH atmosphere without a rescue team on site
Non-entry rescue using retrieval systems is required when the atmosphere is IDLH and a trained entry rescue team is unavailable, to prevent rescuer casualties.