STSC Personal Protective Equipment in Construction 1 — Questions and Answers

Question 1: Under OSHA 29 CFR 1926.100, what ANSI standard governs the selection of hard hats (head protection) for construction workers?

ANSI Z87.1
ANSI Z89.1 (Correct answer)
ANSI Z41
ANSI Z359.1

Correct answer: ANSI Z89.1

OSHA 1926.100(a) requires head protection to meet ANSI Z89.1 (American National Standard for Industrial Head Protection). This standard establishes performance requirements for hard hats based on class and type.

ANSI Z89.1 (Industrial Head Protection) classifies hard hats by: Type (Type I — top impact only; Type II — top and lateral impact protection) and Class (Class E — Electrical, rated to 20,000V; Class G — General, rated to 2,200V; Class C — Conductive, no electrical protection). For most construction, Type I Class E is the minimum — work near electrical hazards requires Class E. Hard hats must bear the ANSI Z89.1 marking, the class designation, and the manufacturer's name and date of manufacture. OSHA 1926.100 requires hard hats wherever workers are exposed to head injuries from falling objects, fixed objects, or electrical hazards.

Question 2: What does the ANSI Z87.1 standard designate, and what marking indicates that safety glasses provide impact protection?

Hearing protection — the 'NRR' marking indicates impact rating
Eye and face protection — the '+' symbol after the manufacturer mark indicates high impact rating (Correct answer)
Respiratory protection — P100 filter marking indicates impact protection
Foot protection — ASTM F2413 marking indicates impact resistance

Correct answer: Eye and face protection — the '+' symbol after the manufacturer mark indicates high impact rating

ANSI Z87.1 establishes performance requirements for eye and face protection. Safety glasses with a '+' marking (e.g., Z87+) meet the high-velocity impact test, providing greater impact protection than basic Z87 glasses.

ANSI/ISEA Z87.1 (Occupational and Educational Personal Eye and Face Protection Devices) classifies eye protection by: impact level (Z87 — basic impact; Z87+ — high impact tested), type (glasses, goggles, face shields), and additional properties (D3 — liquid splash, D4 — dust, D5 — fine dust, W1–W14 — welding shade). On construction sites, OSHA 1926.102 requires eye protection meeting ANSI Z87.1 for operations involving flying particles, molten metal, liquid chemicals, acid or caustic liquids, chemical gases, or radiant energy. High-impact (Z87+) lenses are required for operations with significant projectile risks.

Question 3: A construction worker must select hearing protection for an area where the 8-hour time-weighted average (TWA) noise level is 95 dB(A). What is the minimum Noise Reduction Rating (NRR) of the hearing protection device needed?

NRR 5 — any rated device is sufficient
NRR 25 or higher to reduce effective exposure to below 90 dB(A) using OSHA's derated calculation (Correct answer)
NRR 10 using OSHA's derating formula
NRR 30 with no derating required

Correct answer: NRR 25 or higher to reduce effective exposure to below 90 dB(A) using OSHA's derated calculation

OSHA requires that hearing protection reduce employee noise exposure to below the PEL. Using OSHA's derating formula [(NRR-7)/2], an NRR of at least 25 is needed to achieve a minimum 9 dB reduction and bring effective exposure below 90 dB(A).

OSHA's hearing protection calculation uses the formula: Effective Noise Reduction = (NRR - 7) ÷ 2. For an NRR 25 device: (25-7)/2 = 9 dB reduction. If ambient noise is 95 dB(A), effective exposure = 95 - 9 = 86 dB(A), which is below OSHA's 90 dB(A) PEL. For an NRR 17 device: (17-7)/2 = 5 dB reduction → 95-5 = 90 dB(A), which is at the PEL but not below it. NIOSH recommends additional derating (50% for earmuffs, 70% for formable earplugs, 50% for all other plugs) based on real-world fit effectiveness. For a 95 dB work environment, a hearing protection device with NRR of at least 25 is the minimum OSHA-acceptable choice using their calculation method.

Question 4: Under OSHA's foot protection standard (1926.96), what ASTM standard governs safety-toed footwear for construction workers?

ASTM F2413 — specifying impact and compression resistance for safety-toed footwear (Correct answer)
ASTM E119 — fire resistance testing
ASTM D2240 — material hardness testing
ASTM G155 — UV exposure testing

Correct answer: ASTM F2413 — specifying impact and compression resistance for safety-toed footwear

OSHA 1926.96 requires safety-toed footwear to meet ASTM F2413 (Standard Specification for Performance Requirements for Foot Protection), which sets minimum impact (75 ft-lb) and compression (2,500 lb) resistance for safety toes.

ASTM F2413 establishes performance requirements for safety-toed footwear, including: (1) Impact resistance (I/75 — toe must resist 75 foot-pounds of impact without crushing); (2) Compression resistance (C/75 — toe must resist 2,500 lbs of static load); (3) Optional features: EH (Electrical Hazard rated — 600V), SD (Static Dissipative), PR (Puncture Resistant), MT (Metatarsal Protection), CD (Conductive). OSHA 1926.96 requires safety-toed footwear for workers where foot injuries may result from falling or rolling objects, crushing or penetrating actions, and for workers working around electrical hazards. Footwear must be marked to show the applicable ASTM F2413 ratings.

Question 5: What is the key difference between an N95 filtering facepiece respirator and a P100 filtering facepiece respirator under NIOSH's 42 CFR Part 84?

N95 filters 99.97% of particles; P100 filters 95% of particles
N95 is not oil-resistant and filters 95% of particles; P100 is oil-proof and filters 99.97% of particles (Correct answer)
N95 provides full-face protection; P100 is a half-face respirator
There is no difference — both provide equal protection for construction use

Correct answer: N95 is not oil-resistant and filters 95% of particles; P100 is oil-proof and filters 99.97% of particles

NIOSH designations indicate: N = Not oil-resistant; R = oil-Resistant; P = oil-Proof (most oil-resistant). Numbers indicate filtration efficiency: 95 = 95%, 99 = 99%, 100 = 99.97%. P100 provides higher filtration efficiency and oil-proof characteristics.

NIOSH's 42 CFR Part 84 respirator classification system uses two designations: Oil Resistance (N = not resistant to oil aerosols; R = resistant to oil aerosols; P = strongly resistant/proof against oil aerosols) and Filter Efficiency (95 = 95% efficient; 99 = 99% efficient; 100 = 99.97% efficient against 0.3 micron NaCl test particles). An N95 is not oil-resistant and filters 95% of airborne particles. A P100 is oil-proof and filters 99.97% of particles — making it the highest rated disposable filter. For construction applications: N95 is sufficient for nuisance dust and crystalline silica (with assigned protection factor). P100 is required for oil-based mists, welding fumes requiring higher protection, and applications requiring maximum filtration.

Question 6: An employer requires workers to wear cut-resistant gloves when using a utility knife. Which ANSI/ISEA standard defines cut resistance ratings for hand protection?

ANSI/ISEA 138 — Impact Protection
ANSI/ISEA 105 — Hand Protection (Correct answer)
ANSI Z359.1 — Fall Protection
ASTM F1790 — Thermal Resistance

Correct answer: ANSI/ISEA 105 — Hand Protection

ANSI/ISEA 105 (American National Standard for Hand Protection Selection Criteria) defines the testing and classification system for cut resistance, puncture resistance, and other performance properties of work gloves.

ANSI/ISEA 105 establishes the testing and classification system for work gloves. Under the current version (2016), cut resistance is rated A1 through A9 using the ASTM F2992 test method (TDM test), where A1 is the minimum cut resistance and A9 is the maximum. For construction applications requiring cut protection: utility knife work typically requires A2–A4; sheet metal handling may require A6–A9. The standard also rates: puncture resistance (0–5), needle puncture resistance (0–5), and heat/flame resistance. OSHA 1926.28 requires employers to select hand protection appropriate to the specific hazards — ANSI/ISEA 105 provides the selection framework.

STSC Personal Protective Equipment in Construction 1

Under OSHA 29 CFR 1926.100, what ANSI standard governs the selection of hard hats (head protection) for construction workers?