What term is used for an electrical product that prevents a ground fault from causing electric shock?

The term "double-insulated" refers to an electrical product that is designed with an additional layer of insulation to protect users from electric shock in the event of a ground fault. This kind of safety feature means that even if a fault occurs and the internal wiring becomes live, the outer casing remains insulated, thereby reducing the risk of electric shock.

Double insulation typically implies that the device does not require a grounding connection to function safely, as it is manufactured with impedance to direct contact with live parts. This is particularly important in tools and appliances that may not be used in an environment where they can easily be grounded, such as certain handheld devices. The design effectively ensures user safety without relying on grounding as a protective measure.

In contrast, the other terms represent different concepts related to electrical safety and product categories but do not specify the safety feature that directly prevents ground faults from leading to electric shocks. For example, some may refer to insulation types or the configuration of plugs, but none encapsulate the specific protective mechanism that double insulation provides.