What type of receptacle is required under the sink for dishwashers?

The requirement for a grounding-type receptacle under the sink for dishwashers is grounded in safety standards. Dishwashers are considered to be devices that may be subjected to moisture, as they are located near sinks and often encounter water. A grounding-type receptacle provides a path for electrical fault currents to safely return to the ground, reducing the risk of electric shock in case of a short circuit or malfunction.

Using a grounding-type receptacle ensures that any stray electrical currents have a safe outlet, thereby enhancing safety for anyone operating the appliance. This is particularly crucial in areas susceptible to water exposure, as it helps to protect the user from accidental electrocution.

In contrast, while GFCI receptacles, tamper-resistant receptacles, and standard duplex receptacles may be used in various applications, they do not specifically address the grounding needs that are critical when installing dishwashers under sinks. Therefore, the grounding-type receptacle is the most appropriate choice to ensure compliance with safety codes and protect against electrical hazards in this specific context.