Which prong is always the ground prong in a receptacle?

The ground prong in a receptacle system is recognized for its distinct design that prioritizes safety in electrical connections. The round or odd prong serves this purpose because it is shaped differently from the other prongs, typically being round and placed in a specific position in the receptacle. This unique shape ensures that devices can only be plugged in one way, preventing the reverse connection that could pose a risk of electrical shock.

The configuration of receptacles is designed to ensure that the ground connection is made before the line connections, thereby enhancing the safety of electrical appliances. The other prongs, primarily designed to carry current, do not have a special shape and can fit into the receptacle in a way that may allow for improper connections if not designed with safety in mind. This design feature further highlights the role of the ground prong in protecting users from potential electrical hazards.