What does 'raintight' mean in relation to electrical equipment?

The term 'raintight' specifically refers to electrical equipment that is designed to prevent the ingress of water in the form of rain. This means that the equipment is constructed in such a way that it can withstand direct exposure to heavy rain without allowing water to penetrate into its internal components.

This feature is essential for outdoor installations or in environments where electrical equipment may be exposed to wet conditions. Ensuring that electrical equipment is raintight helps to prevent moisture-related issues such as short circuits, corrosion, and ultimately equipment failure, which could pose safety risks.

While protection against humidity, dust ingress, and electrical surges are all important aspects of electrical safety and equipment longevity, they do not specifically align with the definition of 'raintight.' Thus, recognizing the precise meaning of 'raintight' as it pertains to heavy rain exposure clarifies why this is the correct interpretation of the term.