CSS - Certified Safety Supervisor Ergonomics and Confined Space Safety Questions and Answers Flashcards
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What is the lower explosive limit (LEL) threshold at which a confined space atmosphere is considered hazardous under OSHA standards?
Answer: 5% LEL
OSHA considers an atmosphere flammable and hazardous when combustible gas concentration reaches or exceeds 10% of the LEL; entry requires controls below this level.
Which body region is most frequently affected by ergonomic hazards in office and computer workstation environments?
Answer: Neck and upper extremities
Office workers most commonly experience ergonomic injuries in the neck and upper extremities (shoulders, wrists, hands) due to sustained postures and repetitive keyboard/mouse use.
When a confined space rescue team cannot safely enter to rescue a downed worker, what retrieval system component enables non-entry rescue?
Answer: Mechanical retrieval system with a retrieval line attached to the entrant's harness
A mechanical retrieval system attached to the entrant's full-body harness allows attendants to raise the incapacitated worker out of the space without entry.
Which ergonomic assessment tool uses a scoring system based on posture, load/force, and activity to quantify musculoskeletal risk?
Answer: RULA (Rapid Upper Limb Assessment)
RULA evaluates upper body postures, force, and muscle use frequency to produce a risk score that guides ergonomic intervention priority.
Under 29 CFR 1910.146, how long must a completed confined space entry permit be retained after the work it covers is completed?
Answer: At least 1 year
OSHA requires employers to retain cancelled or completed confined space entry permits for at least one year to facilitate review of the permit program.
A Safety Supervisor discovers workers are routinely skipping pre-entry atmospheric testing in a permit-required confined space. What is the first corrective action?
Answer: Stop work immediately, re-train personnel, and enforce the written permit procedures
Skipping atmospheric testing is an immediate life-safety violation; work must stop, personnel must be retrained, and procedures must be enforced before re-entry is permitted.