Technician A says that it is not safe to use conventional tools when working on high-voltage systems. Technician B says that high-voltage pliers have insulation to prevent electric shock from spark plug wires. Who is right?

Technician A is correct to state that it is not safe to use conventional tools when working on high-voltage systems. Conventional tools lack the necessary insulation to protect against the high voltages that can be present in automotive electrical systems, particularly in hybrid and electric vehicles. Using uninsulated tools can expose the technician to severe electrical hazards and risks of electric shock.

Technician B is also accurate in emphasizing that high-voltage pliers come with insulation designed specifically to safeguard against electric shock, making them suitable for handling components like spark plug wires in high-voltage applications. This dedicated insulation allows technicians to work securely on these systems without the risk typically associated with conventional tools.

Together, both technicians provide valid information regarding the use of tools in high-voltage environments, supporting the assertion that specialized insulated tools are essential for safety while conventional tools pose a significant risk.