Fiberglass hot sticks are tested to what degree, including retest requirements?

• A. 100,000 volts for 5 minutes and during retesting 75,000 volts for 1 minute
• B. 75,000 volts for 1 minute and during retesting 100,000 volts for 5 minutes
• C. 50,000 volts for 2 minutes and during retesting 25,000 volts for 1 minute
• D. 120,000 volts for 3 minutes and during retesting 60,000 volts for 2 minutes

Answer: (A)

Dielectric strength testing of fiberglass hot sticks uses a two-stage voltage withstand approach to ensure the insulation can handle extreme stress without breaking down. The initial test applies a high voltage well above normal operating levels—100,000 volts—for 5 minutes. This rigorous demand is intended to reveal any microcracks, pinholes, or moisture ingress that could lead to an insulation failure in the field. If the tool passes that stringent test, it then undergoes a retest at a lower voltage—75,000 volts for 1 minute—to confirm the insulation still holds up under a moderate stress after the heavy test and to detect any latent defects that might show up under repeated use. Other voltage/duration combinations don’t align with this established practice, which balances thorough verification with practical reuse.