Technical Foundation
What Is a Electrical Glove?
Rubber insulating gloves are classified under ASTM D120 by their maximum use voltage and proof-test voltage: Class 00 gloves are rated for use up to 500V AC, Class 0 up to 1000V, Class 1 up to 7,500V, Class 2 up to 17,000V, Class 3 up to 26,500V, and Class 4 up to 36,000V — each class is proof-tested at a significantly higher voltage than its rated maximum use voltage to provide a safety margin. Gloves must always be selected to exceed the actual system voltage being worked on, and OSHA and NFPA 70E require gloves be electrically tested (not just visually inspected) at regular intervals to confirm continued insulating integrity.
Rubber insulating gloves are designed to be worn with an outer leather protector glove in most applications, since the rubber alone provides electrical insulation but very little resistance to cuts, punctures or abrasion that could compromise the insulating barrier — the leather protector is sized specifically to fit over the rubber glove without bunching, which would create a pinch point risking damage to the insulating layer underneath. Gloves must also be visually inspected and air-tested before each use to check for pinholes, cuts or other damage not visible without stretching the material.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| ASTM Voltage Class | Class 00 (500V) through Class 4 (36,000V) | Must exceed the actual system voltage being worked on, with the code-required margin |
| Proof-Test Voltage | Significantly higher than max use voltage per class | Confirms the glove withstands well beyond its rated working voltage before failure |
| Glove Material | Natural rubber, or rubber blends for ozone/chemical resistance | Certain environments (ozone exposure, chemical contact) require a specific rubber formulation |
| Leather Protectors | Required outer glove over rubber insulating glove | Protects the insulating rubber from cuts and abrasion that could create a failure point |
| Retest Interval | Periodic electrical retest required (typically every 6 months) | Ensures continued insulating integrity is verified, not just assumed from visual inspection |
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Applications
Where Electrical Gloves Get Used
Electrical gloves are specified by matching the ASTM voltage class to the actual system voltage being worked on, per OSHA and NFPA 70E requirements.
Electrical Utility Line Work
Class 2-4 high-voltage gloves protecting linemen working on and near energized transmission and distribution lines.
Industrial Electrical Maintenance
Class 0-2 gloves for maintenance electricians working on energized panels and switchgear under arc-flash protocols.
Substation & Switchgear Operations
High-voltage-rated gloves for switching operations and maintenance in electrical substations.
Telecommunications & Low Voltage Work
Class 00 gloves providing insulation for technicians working near low-voltage electrical systems.
Construction Electrical Installation
Class 0-1 gloves for electricians performing energized troubleshooting and testing during installation.
Renewable Energy Installation & Service
Insulating gloves rated for DC and AC voltages present in solar and wind electrical systems.
FAQ
Electrical Gloves Questions, Answered
How do I know which glove class I need for my voltage system?
Select a glove class whose maximum use voltage rating exceeds your actual system voltage, following your facility's electrical safety program and NFPA 70E guidance — as a general reference, Class 0 covers up to 1000V, Class 2 up to 17,000V, and Class 4 up to 36,000V, but always confirm the specific class required against your documented system voltage and applicable safety standard rather than estimating.
Why do I need leather protector gloves over my rubber insulating gloves?
Rubber insulating gloves provide the electrical insulation but have very little resistance to cuts, punctures, or abrasion, any of which can create a pinhole that compromises the insulating barrier without being visually obvious. Leather protectors worn over the rubber gloves shield them from this mechanical damage and are required in most work rules — a glove without proper protectors is often not compliant even if the rubber alone is correctly rated.
How often do electrical gloves need to be retested?
OSHA and industry standards generally require rubber insulating gloves be electrically retested at a set interval (commonly every 6 months) by a qualified testing lab or facility, in addition to a visual and air inspection before every single use. A glove that hasn't been retested within its required interval should be taken out of service regardless of its visual condition.
What should I check before each use of electrical gloves?
Before every use, visually inspect the glove for cuts, punctures, cracks, or embedded material, and perform an air test — rolling or squeezing the glove to trap air inside and checking for leaks that indicate a pinhole not visible by eye alone. Also confirm the glove's test date sticker or tag shows it's within its current certification period.
Can electrical gloves be used near ozone-producing equipment?
Standard natural rubber gloves can degrade faster when exposed to ozone (produced by some high-voltage equipment and switching operations), so gloves specifically rated for ozone resistance should be specified for regular work in these environments — check the glove's specification sheet for an ozone resistance rating if this exposure is part of the job.
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