Rubber insulating gloves are categorized by voltage class, which defines their maximum safe use in alternating current (AC) or direct current (DC) applications. Choosing the correct class of glove is essential to ensure adequate protection based on the voltages you may encounter in your work environment.
These classes are standardized by international regulations such as ASTM D120 (U.S.) and IEC 60903 (International), and each class is clearly marked on the glove cuff for easy identification.
Voltage Class Overview
| Class | Maximum Use Voltage (AC) | Maximum Use Voltage (DC) | Proof Test Voltage (AC) | Typical Applications |
|---|---|---|---|---|
| 00 | 500 V | 750 V | 2,500 V | Meter reading, control panels, low-voltage circuits |
| 0 | 1,000 V | 1,500 V | 5,000 V | Commercial installations, service work |
| 1 | 7,500 V | 11,250 V | 10,000 V | Substations, cable maintenance |
| 2 | 17,000 V | 25,500 V | 20,000 V | Power lines, transformer stations |
| 3 | 26,500 V | 39,750 V | 30,000 V | Industrial switching stations, overhead work |
| 4 | 36,000 V | 54,000 V | 40,000 V | High-voltage transmission, rail electrification |
Maximum Use Voltage is the highest voltage at which the glove may be used with a safety margin.
Proof Test Voltage is the level at which each glove is tested during quality control.
Class 00 and Class 0 gloves are suitable for low-voltage systems and routine electrical tasks.
Class 1 through Class 4 gloves are required for medium to high-voltage work and are typically used by utility crews, substation operators, and linemen.
Important Selection Note
Always select a glove with a voltage rating higher than the expected exposure, considering possible transients or overvoltages. For example, when working on a 600V system, a Class 0 glove (rated for 1,000V) would be appropriate. Never use gloves at their limit—always build in a safety buffer.
Understanding voltage classes is critical in glove selection. Choosing a glove with the correct rating ensures protection not only from standard voltage but also from unexpected surges, contributing to a safer and more compliant worksite.