What is the smallest size locking and grounding type receptacle that may be used to provide shore power for boats?

The minimum size locking and grounding type receptacle that may be used to provide shore power for boats is 30A. This specification is important for ensuring that the electrical systems of boats can safely handle the power requirements while minimizing the risk of overload and ensuring secure connections.

A 30A receptacle not only meets the necessary voltage and current requirements typically needed by recreational boats and smaller vessels but also contributes to safer operations in a maritime environment. Using a receptacle that is too small could lead to overheating or failure, risking both the vessel and individuals involved.

In contrast, receptacles rated at lower capacities, such as 20A, are inadequate for most boat power supply needs, while receptacles rated at higher capacities, such as 40A or 50A, are more than what is typically necessary for smaller vessels, though they may be used in specific situations for larger boats or more extensive power requirements. However, the 30A receptacle remains the standard minimum for establishing shore power hookups for smaller to medium-sized boats in compliance with electrical code requirements.