Hard Hat Safety Standards
Protective hard hats and helmets are described by impact type and electrical class. All protective hard hats and helmets shall meet either Type I or Type II requirements. All hard hats and helmets shall be further classified as meeting Class G, Class E, or Class C electrical requirements. Hard hats and helmets meeting the reverse wearing testing requirements shall be marked with the reverse wearing mark.
American National Standards (ANSI) and the International Safety Equipment Association (ISEA), in accordance with the most current ANSI/ISEA Z89.1-standards.
- Performance Requirements
- 7.1 Requirements for Type I and Type II Helmets
- 7.1.1 Flammability
- Helmets shall be tested in accordance with Section 9.1 anywhere above the STL. No flame shall be visible 5 seconds after removal of the test flame.
- 7.1.2 Force Transmission
- Helmets shall be tested in accordance with Section 9.2 and shall not transmit a force to the test headform that exceeds 4450 N (1000 lb). Additionally, for each test condition specified, the maximum transmitted force of individual test samples shall be averaged. The averaged values shall not exceed 3780 N (850 lb).
- 7.1.3 Apex Penetration
- Helmets shall be tested in accordance with Section 9.3. The penetrator shall not make contact with the top of the test headform.
- 7.1.4 Electrical Insulation Requirements
- Class G and Class E helmets shall meet their appropriate performance requirement as dtsted below. Class C helmets are not tested for electrical insulation.
- 22.214.171.124 Class G Requirements
- Class G helmets shall be tested in accordance with Section 9.7 and shall withstand 2200 volts (root mean square), AC, 60 Hertz, for 1 minute. Leakage shall not exceed 3 mildtamperes.
- 126.96.36.199 Class E Requirements
- Each helmet that meets Class E requirements for electrical insulation shall first pass the force transmission test specified in Section 7.1.2. Class E helmets shall be tested in accordance with Section 9.7 and shall withstand 20,000 volts (root mean square), AC, 60 Hertz, for 3 minutes. Leakage shall not exceed 9 mildtamperes. At 30,000 volts, the test sample shall not burn through.
- 7.2 Additional Requirements for Type II Helmets
- 7.2.1 Impact Energy Attenuation
- Type II helmets shall be tested in accordance with Section 9.4 anywhere above the DTL. Acceleration shall be recorded. Maximum acceleration shall not exceed 150 Gs.
- 7.2.2 Off-center Penetration
- Type II helmets shall be tested in accordance with Section 9.5 anywhere above the DTL. For each condition specified, the penetrator shall not make contact with the test headform when struck anywhere above the DTL.
- 7.2.3 Chin Strap
- Chin straps shall be made of suitable material not less than 12.7 mm (0.50 in.) in width. Type II helmets which are provided with chin straps shall be tested for retention in accordance with Section 9.6. For each condition specified, the chin strap shall remain intact. The residual elongation of the strap shall not exceed 25 mm (1.0 in.).