What proof test voltage must a hardhat pass when new and clean?

A hardhat must pass a proof test voltage of 20kV when it is new and clean. This testing requirement is established to ensure that the hardhat can effectively provide adequate protection against electrical hazards that a lineman may encounter while working on or near high voltage power lines.

The proof test is a critical assessment designed to validate the insulation properties of the hardhat. The specified voltage level tests the integrity of the material and construction of the hardhat, ensuring it can withstand electrical stress. Passing this test means the hardhat can serve its intended purpose of protecting the wearer's head from both impact and electric shock.

Understanding the testing standards helps in choosing appropriate personal protective equipment (PPE) for lineman tasks, as safety is of utmost importance in this line of work. This knowledge also underlines the significance of regularly inspecting and replacing hardhats as they age or incur damage, maintaining compliance with safety regulations.