Which precaution should NOT be followed when working with electrical systems?

Using non-rated equipment represents a significant safety hazard when working with electrical systems. This equipment may not be designed to handle electrical loads safely or comply with safety standards, leading to potential shock or fire risks. Rated equipment is specifically tested and approved for electrical work, ensuring that it can safely withstand the voltages and conditions encountered during operation.

In contrast, ensuring that all tools are insulated, verifying that power is off before starting work, and staying clear of wet areas are critical precautions. Insulated tools help protect against accidental electrical contact, turning off the power prevents inadvertent electrical shocks, and avoiding wet areas reduces the risk of conductive pathways that could lead to electrocution. Each of these precautions is fundamental to maintaining a safe working environment when dealing with electrical systems.