Many power tools must have a three-wire cord plugged into a grounded receptacle or be double insulated. Some are powered by a low voltage transformer. Which equipment does this describe?

Many power tools must have a three-wire cord plugged into a grounded receptacle or be double insulated. Some are powered by a low voltage transformer. Which equipment does this describe?

• A. Power Tools
• B. Extension Cords
• C. Heaters
• D. Lighting Fixtures

Answer: (A)

Electrical safety design for portable equipment uses grounding, double insulation, or low-voltage supplies to reduce shock risk. A three-wire cord with a grounding pin provides a safe path to earth if a fault occurs, protecting the user when the tool has exposed conductive parts. If a tool is double insulated, it is built with two layers of insulation and no exposed metal that could become energized, so grounding isn’t needed. Some tools are designed to run on low voltage from a transformer to further minimize shock risk. Taken together, these safety approaches describe power tools.

Electrical safety design for portable equipment uses grounding, double insulation, or low-voltage supplies to reduce shock risk. A three-wire cord with a grounding pin provides a safe path to earth if a fault occurs, protecting the user when the tool has exposed conductive parts. If a tool is double insulated, it is built with two layers of insulation and no exposed metal that could become energized, so grounding isn’t needed. Some tools are designed to run on low voltage from a transformer to further minimize shock risk. Taken together, these safety approaches describe power tools.