Class E vs Class G Hard Hat: Electrical Protection Explained

Class E vs Class G Hard Hat: ANSI/ISEA Z89.1-2014 Electrical Protection Classes Explained

ANSI/ISEA Z89.1-2014 defines three electrical protection classes for hard hats: Class E (Electrical), Class G (General), and Class C (Conductive). The classification determines the voltage level at which the hat's shell is dielectric proof-tested and the maximum allowable leakage current. Class E is the highest-rated class, suitable for high-voltage electrical environments. Class G covers lower-voltage general industrial hazards. Class C provides no electrical insulation whatsoever and must never be used in environments with electrical exposure. This guide explains each class, who needs each one, and how to confirm which class your hard hat provides.

Electrical Class Comparison Table

Class E Hard Hats: 20,000-Volt Protection for High-Voltage Environments

Class E (Electrical) hard hats are dielectric proof-tested to 20,000V AC with leakage current not exceeding 9 mA. This is the highest electrical insulation class in ANSI Z89.1-2014. Class E is required for workers exposed to overhead high-voltage power lines, high-voltage switchgear, transmission line construction, and any environment where contact with energized conductors operating above 2,200V is possible.

Class E hard hats are manufactured with non-conductive shells (polyethylene or phenolic resin) and non-conductive suspensions. Metal components — such as metal ratchet parts or metal accessory attachments — must not be used with Class E hats in electrical environments, as they create conductive pathways that defeat the electrical insulation. Class E hats must also not have ventilation holes, which would compromise the dielectric performance of the shell.

Typical Class E users: electrical utility linemen, transmission line workers, high-voltage substation maintenance technicians, electrical contractors working near energized overhead lines, and arc flash PPE programs where NFPA 70E specifies Class E head protection.

Shop Class E hard hats at WC Safety including the MSA V-Gard Class E and MSA Skullgard Class E.

Class G Hard Hats: 2,200-Volt Protection for General Industry

Class G (General) hard hats are proof-tested to 2,200V AC with leakage not exceeding 3 mA. Despite the lower voltage rating, Class G hats provide meaningful electrical insulation against incidental contact with lower-voltage circuits common in general construction and manufacturing. The vast majority of OSHA-regulated construction and industrial worksites use Class G hard hats as the baseline.

Like Class E hats, Class G shells must be non-conductive and must not have ventilation holes. Class G hats are appropriate when workers may encounter electrical hazards below 2,200V AC — typical of standard commercial building electrical systems (120V, 240V, 480V) where incidental contact is possible but direct work on high-voltage equipment is not the primary task.

Typical Class G users: general construction workers, ironworkers, carpenters, laborers, HVAC technicians, plumbers, and general industry workers in environments with standard commercial voltage equipment.

Class C Hard Hats: No Electrical Protection

Class C (Conductive) hard hats have not been tested for dielectric performance and provide no electrical insulation. Class C hats are typically aluminum or other conductive materials, or vented plastic shells where the ventilation holes breach the dielectric integrity. Class C hats must never be used in environments where contact with energized electrical components is possible. Their use is appropriate only in purely mechanical hazard environments where the worker is never exposed to electrical hazards and needs lightweight ventilation — such as some mining and heat-stress applications.

OSHA does not prohibit Class C hats per se, but OSHA 29 CFR 1910.132 requires that PPE match identified hazards. Using a Class C hat where electrical hazards are present would be a clear violation of 1910.132 and 1910.135.

How to Identify Your Hard Hat's Electrical Class

ANSI/ISEA Z89.1-2014 requires every compliant hard hat to be permanently marked inside the shell with the Class designation (E, G, or C) along with the Type, manufacturer, and standard edition. Always verify the marking before using a hard hat in an electrical environment. Do not assume a hard hat provides electrical protection without confirming the marking. The Class E marking confirms the hat was tested to 20,000V — this is a manufacturing test, not a guarantee the hat continues to meet that rating after damage or aging.

Electrical Class and Hard Hat Type Are Independent

The electrical Class (E, G, C) and the impact Type (I, II) are two independent attributes. You can select a Type II Class E hat for environments requiring both lateral impact protection and high-voltage electrical insulation. Both attributes must match your hazard assessment. See the Type I vs Type II guide for impact type selection.

NFPA 70E and Arc Flash Head Protection

NFPA 70E (2021 edition) requires arc-rated head protection as part of PPE Category 1 and above. Arc-rated hard hat liners or arc-rated face shields are used in conjunction with Class E hard hats in arc flash PPE ensembles. The hard hat itself must be Class E (non-conductive, non-vented) for use near energized electrical equipment. See our NFPA 70E arc flash safety guide for full PPE category requirements.

Maintenance and Inspection for Electrical-Rated Hats

Electrical insulation can degrade with age, UV exposure, chemical contact, and physical damage. Inspect Class E and G hats before each use specifically for: cracks or holes that breach the shell; signs of UV degradation (chalky, brittle surface); chemical staining or degradation; and metal accessory attachments that create conductive paths. Replace any Class E or G hat that shows shell damage. Never drill holes, add metal attachments, or paint Class E or G hats — all of these actions compromise electrical insulation.

Class E vs Class G: Which Should You Choose?

The decision is straightforward: if your work or your workers' proximity to energized conductors involves voltages above 2,200V AC — particularly overhead transmission lines, high-voltage substations, and high-voltage switchgear — specify Class E. For all other electrical hazard environments involving standard commercial voltages (120V to 480V), Class G provides appropriate insulation. When in doubt, Class E is the safer choice — it costs minimally more and provides maximum electrical insulation.

Related Products at WC Safety

• Class E hard hats — MSA V-Gard and Skullgard
• Class G hard hats — full selection
• Hard hat accessories: face shields, liners, brackets
• Complete head protection at WC Safety
• Full PPE catalog

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