To operate power tools safely according to CSA guidelines, they must be?

Operating power tools safely according to CSA (Canadian Standards Association) guidelines primarily requires that the tools be either grounded or insulated. Grounding provides a direct path for electrical current to safely dissipate in case of a fault, which helps prevent electric shocks. Insulation, on the other hand, means that the tools are designed so that electrical components are protected from accidental contact, further reducing the risk of electric shocks.

This measure is particularly critical when dealing with tools that operate on electricity because it significantly enhances user safety, especially in environments where moisture or conductive materials might be present. Thus, ensuring that power tools are properly grounded or insulated is essential for compliance with safety standards and the prevention of electrical hazards.