Why is it important to ground electric power tools?

Grounding electric power tools is crucial to ensure safety from electrical shock. When tools are grounded, any electrical fault—such as a short circuit—can direct the excess current to the ground instead of through a person using the tool. This is particularly important because power tools often have metal components, which pose a risk if they accidentally become energized due to insulation failures or other electrical issues.

By connecting the tool's metal casing to a ground, the grounding system provides a safe path for the stray current, mitigating the risk of serious injury or even fatal electric shock to the user. This safety measure is a fundamental aspect of electrical safety standards and codes, helping ensure that tools are used safely in various environments, especially where moisture might increase the risk of shock.