OSHA's Head Protection standard, 29 CFR 1910.135, requires employers to make sure each affected employee wears a protective helmet when working in areas where there is a potential for head injury from falling objects. Where workers are near exposed electrical conductors that could contact the head, the helmet must also be designed to reduce electrical shock hazards.
Head injuries can cause permanent disability or death, and many happen in ordinary settings: tools dropped from mezzanines, materials falling from racking, or a worker standing up into a low beam. The right helmet, worn and maintained correctly, is the last line of defense against those hazards.
What Is the Head Protection Standard?
Section 1910.135 is part of OSHA's general industry PPE rules in 29 CFR 1910 Subpart I. It relies on the PPE general requirements in 1910.132 for hazard assessment, payment and training. Construction work is covered by 29 CFR 1926.100.
Helmets must comply with ANSI/ISEA Z89.1-2009, Z89.1-2003 or Z89.1-1997, or be demonstrated to be equally effective.
Who Must Comply?
Any employer whose hazard assessment finds a potential for head injury from falling objects, or from electrical contact, must provide protective helmets. Common examples include warehouses with high racking, manufacturing plants with overhead cranes or conveyors, utilities, maintenance work below other crews, and any area where work is performed overhead.
Key Requirements
Protection from falling objects
Under 1910.135(a)(1), employees working where there is a potential for injury to the head from falling objects must wear a protective helmet.
Protection from electrical hazards
Under 1910.135(a)(2), employees working near exposed electrical conductors that could contact the head must wear a helmet designed to reduce electrical shock hazard.
Consensus standard
Under 1910.135(b), helmets must meet one of the listed ANSI Z89.1 editions, or the employer must show the helmet is at least as effective.
ANSI Z89.1 Types and Classes
ANSI Z89.1 groups helmets by the impact they are tested for (type) and by electrical performance (class).
Types
- Type I: designed to reduce the force of impact from a blow to the top of the head.
- Type II: designed to reduce the force of impact from blows to the top and sides of the head. Type II helmets also have penetration resistance testing off-center.
Classes
- Class G (General): proof-tested at 2,200 volts. Intended to reduce the danger of contact with low-voltage conductors.
- Class E (Electrical): proof-tested at 20,000 volts. Intended to reduce the danger of contact with higher-voltage conductors.
- Class C (Conductive): no electrical protection. Often vented, and not for use near electrical hazards.
The type and class are marked inside the shell, along with the manufacturer, the date of manufacture and the ANSI edition. Some helmets also carry a reverse-donning mark, meaning they were tested to be worn backward, and markings for high-visibility or low-temperature performance.
Hard Hats vs. Safety Helmets
Traditional hard hats are usually Type I. Many employers now choose Type II safety helmets, often with chin straps, because they protect against side impacts and are more likely to stay on during a slip, trip or fall. In December 2023, OSHA published a safety and health information bulletin describing the benefits of modern safety helmets and announced it would replace traditional hard hats for its own field staff. The standard does not require Type II, but the hazard assessment should consider side impacts and falls.
Bump caps are not protective helmets. They are meant for minor bumps against fixed objects and do not meet ANSI Z89.1 for falling-object hazards.
Inspection, Care and Replacement
- Inspect the shell and suspension before each use for cracks, dents, gouges, chalky or faded areas and brittleness.
- Check that suspension straps and attachment points are intact and adjusted to fit.
- Remove any helmet from service after it takes an impact, even if no damage is visible.
- Follow the manufacturer's replacement intervals for shells and suspensions. Many manufacturers recommend replacing suspensions about every 12 months and shells every few years, sooner in heat, sunlight or chemical exposure.
- Do not drill holes, paint the shell, store helmets in rear windows, or add accessories that the manufacturer has not approved.
- Wear the helmet as designed. Only wear it backward if it carries a reverse-donning mark.
Employer Payment and Training
Employers must provide protective helmets at no cost to employees when required by the hazard assessment, and train workers on when helmets are required, how to wear and adjust them, their limits, and how to inspect and care for them. Written certification of PPE training is required under 1910.132(f).
Penalties and Enforcement
OSHA cites 1910.135 when workers are exposed to overhead or electrical hazards without suitable helmets, and often cites 1910.132 at the same time for missing hazard assessments or training. Penalties are adjusted annually for inflation. Common findings include visitors and contractors entering hard hat areas without helmets, damaged or expired helmets, Class C helmets used near energized equipment and bump caps worn where falling-object hazards exist.
Common Compliance Mistakes
- Not defining and posting hard hat areas.
- Using Class C or vented helmets near electrical hazards.
- Keeping helmets in service after an impact.
- Ignoring manufacture dates and replacement schedules.
- Allowing bump caps where materials can fall.
- Forgetting to cover visitors, drivers and contractors.
How to Comply: Step by Step
- Assess head hazards. Identify overhead work, falling-object exposures, low clearances and electrical hazards.
- Define hard hat areas. Mark where helmets are required and include visitors and contractors.
- Select type and class. Choose Type I or II and Class G, E or C based on the assessment.
- Provide and fit. Supply helmets at no cost and adjust suspensions to each worker.
- Train and certify. Cover use, limits, inspection and care, and document training.
- Inspect regularly. Add helmet checks to routine PPE and area inspections.
- Replace on schedule. Track manufacture dates and replace after impacts or per the manufacturer.
How SMS360 Helps
SMS360's Audits & Inspections module lets supervisors run PPE and area inspections on a phone, photograph damaged helmets and assign corrective actions. Safety Observations capture workers seen without head protection, and Training Management keeps PPE training records and certifications in one place.
Frequently Asked Questions
When does OSHA require a hard hat?
When there is a potential for head injury from falling objects, or when workers are near exposed electrical conductors that could contact the head. The employer's hazard assessment decides where helmets are needed.
What is the difference between Type I and Type II?
Type I helmets are tested for impacts to the top of the head. Type II helmets are tested for impacts to the top and sides.
Which class is needed for electrical work?
Class E helmets are proof-tested to 20,000 volts and are intended for higher-voltage exposures. Class G is tested to 2,200 volts. Class C offers no electrical protection.
How often should hard hats be replaced?
OSHA does not set a fixed interval. Follow the manufacturer's instructions, replace any helmet after an impact, and remove helmets with visible damage or degradation.
