What type of switch must hand-held power tools have?

Hand-held power tools are required to have a constant pressure switch for safety reasons. A constant pressure switch ensures that the tool will only operate when the user actively maintains pressure on the switch. This feature helps prevent accidental starts and minimizes the risk of injury, especially if the operator's grip slips or if the tool is dropped.

The design of a constant pressure switch means that as soon as the user releases the switch, the power to the tool is cut off, providing an added layer of safety. This is particularly crucial in hand-held tools, where the user has a more direct physical interaction with the equipment, making the potential for accidents higher compared to stationary machinery.

Other types of switches, such as a standard switch or toggle switch, may not provide the same level of safety since they can remain in the 'on' position even if the operator is no longer holding them. Thus, the requirement for a constant pressure switch aligns with safety regulations aimed at reducing the likelihood of accidents during the operation of hand-held power tools.