Safety and OSHA Regulations Flashcards

Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), which scenario requires a WRITTEN energy control procedure rather than allowing a simplified procedure?

Answer: Equipment with multiple energy sources where isolation requires more than one lockout device

OSHA 1910.147 allows a simplified procedure only for equipment with a single, easily identified energy source that can be completely de-energized and locked out with a single device. Equipment with multiple energy sources — electrical, pneumatic, hydraulic, thermal, gravitational — requires a documented written energy control procedure because the sequence of isolation and verification steps must be precisely specified to prevent partial de-energization errors.

A maintenance technician is performing a group lockout on a large conveyor system. After all authorized employees have applied their individual locks, one worker finishes early and removes their personal lock while others are still working. Under 29 CFR 1910.147, what is the CORRECT action for the supervisor?

Answer: Re-apply a supervisor lock in place of the removed lock until all workers are clear

OSHA's group lockout provisions require that each authorized employee maintain personal protection throughout their exposure. When an employee removes their lock prematurely, the employer's group lockout procedure must ensure continued protection — typically through a supervisor or primary authorized employee holding a group hasp lock that cannot be removed until all individual locks are accounted for. Simply allowing the removal violates the one-person/one-lock principle and exposes remaining workers. The correct response is to restore the level of protection through the designated group control mechanism.

OSHA's Hazard Communication Standard (29 CFR 1910.1200) requires Safety Data Sheets to follow the GHS 16-section format. A supervisor claims that Section 8 (Exposure Controls/PPE) is sufficient to determine safe handling procedures without consulting other sections. Which SDS section would MOST CRITICALLY be omitted that could lead to an incompatible storage incident?

Answer: Section 7 — Handling and Storage

Section 7 (Handling and Storage) contains critical information about incompatible materials, temperature limits, segregation requirements, and conditions to avoid — all of which are essential for preventing reactive, flammable, or toxic incidents during storage. While Section 8 covers PPE and exposure limits for workers handling the substance, it does not address chemical incompatibilities or storage conditions that could cause spontaneous reactions, fires, or explosions. Omitting Section 7 is the most direct path to an incompatible storage incident.

Under OSHA's Confined Space standard (29 CFR 1910.146), an atmospheric testing sequence must be followed in a specific order before entry. What is the CORRECT order for testing a permit-required confined space?

Answer: Oxygen → Flammability → Toxic contaminants

OSHA 1910.146 and industry best practice specify testing in the order: (1) Oxygen first, because most combustible gas meters are oxygen-compensated and read inaccurately in oxygen-deficient (23.5%) atmospheres, making flammability readings unreliable if oxygen is tested later; (2) Flammability (LEL/UEL) second, since an explosive atmosphere must be ruled out before introducing any ignition sources including the sensor itself; (3) Toxic contaminants last, as these require more precise instrument calibration and the first two tests establish whether the environment is safe enough for the detector to function correctly.

A facility experiences a recordable injury where an employee fractures a finger operating a press brake. The OSHA 300 Log entry is made. Three months later, the injury is reclassified by the physician as a sprain with no days away from work. Under 29 CFR 1904, what is the CORRECT recordkeeping action?

Answer: Update the existing entry to reflect the revised diagnosis and recalculate any totals

Under 29 CFR 1904.7 and OSHA's recordkeeping rules, when new information changes the classification of an injury — such as a reclassification from fracture to sprain or a change in days-away-from-work count — the employer must update the OSHA 300 Log entry. The correct approach is to update the existing entry (not delete it, which would constitute falsification, and not leave it unchanged, which would be inaccurate). Line-through with a note is the appropriate method for paper logs when correcting an error, but a reclassification based on medical judgment requires updating the case classification fields and recalculating affected column totals.

Under OSHA's Machine Guarding standard (29 CFR 1910.212), a point-of-operation guard on a mechanical power press is found to have a gap that allows a 6mm diameter rod to pass through and reach the danger zone. The employer argues the guard is compliant because it stops fingers. What OSHA-referenced measurement standard does this gap VIOLATE?

Answer: The Safe Distance Formula, which calculates guard opening size based on distance from the hazard

OSHA 1910.217 and ANSI B11.1 reference the Safe Distance Formula (also called the Opening Size vs. Distance table), which specifies that the allowable opening in a guard depends on how far the opening is from the hazard point — smaller openings are permitted only when the guard is close to the danger zone, and larger openings require the guard to be further away. A 6mm gap near a point of operation likely violates this formula because at short guard-to-hazard distances, even small openings can allow finger insertion far enough to reach the danger zone. The employer's argument that it stops fingers ignores the formula's geometric basis for calculating reach-through distance.