What is the proof test voltage for Class 4 gloves?

• A. 60,000 volts
• B. 32,000 volts
• C. 28,000 volts
• D. 40,000 volts

Answer: (D)

The test that gloves undergo uses a high, standardized voltage to verify the material hasn’t developed defects that could puncture insulation under real use. For Class 4 gloves, the established proof test voltage is 40,000 volts. This value provides a safety margin above the glove’s working voltage, ensuring any hidden flaws don’t go unnoticed before the glove is used on live lines. In practice, the glove is inflated and placed in the tester, then the test voltage is applied to check for current leakage or arcing; if the glove holds the voltage without breakdown, it passes.