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Why Do Gloves Come in Different Classes?

Electrical insulating gloves are manufactured in different voltage classes to provide the appropriate level of protection for the electrical hazards a worker may encounter. Not all electrical work involves the same voltage exposure, so gloves must be matched to the maximum voltage risk of the task to ensure proper safety and compliance.

The Purpose of Glove Classes

Electrical systems operate across a wide range of voltages—from low-voltage control circuits to high-voltage transmission equipment. Because of this, a single glove type cannot safely cover every application. Glove classes exist to:

  • Provide insulation appropriate to the voltage exposure
  • Reduce risk of electrical shock and arc incidents
  • Ensure compliance with ASTM and OSHA requirements
  • Help workers quickly identify the correct protection level in the field

Each class is designed and tested to withstand specific electrical stresses, allowing technicians to choose the proper glove for the job.

Voltage Determines the Class You Need

The primary factor in selecting a glove class is the maximum voltage you could be exposed to during your work. Once that voltage risk is identified, you can select a glove class rated to safely protect against it.

Every class of electrical glove is permanently marked and color-coded, making it easy to verify the protection level before use.

Standard Electrical Glove Classes (ASTM D120)

Below is a general overview of ASTM D120 glove classes and their typical use ratings:

Why Not Just Use the Highest Class?

While it may seem safer to always wear the highest-rated glove, that approach isn’t always practical. Higher-class gloves are thicker and less flexible, which can reduce dexterity and increase fatigue during detailed tasks. Choosing the correct class balances protection and performance—providing enough insulation while still allowing precise work.