Which enclosure type is suitable for indoor use where splashing water may occur?

The correct answer is Type 4. Type 4 enclosures are specifically designed to provide a high level of protection against water and dust. They are suitable for both indoor and outdoor applications and can withstand splashing water, making them ideal for environments where moisture is present.

In various indoor settings, such as manufacturing facilities or workshops, equipment may be exposed to water splashes, which necessitates a robust enclosure to prevent moisture ingress. Type 4 enclosures achieve this through their design, which includes gaskets and seals that prevent water from entering, ensuring that the internal components remain safe and operational.

It's important to recognize that while Type 1 enclosures offer protection against dust and light splashes, they do not provide the same level of water resistance as Type 4. Type 2 enclosures are generally designed for indoor use but do not have the same watertight characteristics. Type 3 enclosures provide some protection against falling water and windblown dust but may not effectively prevent water splashes.

Thus, Type 4 is the most suitable choice for safeguarding electronic equipment in an indoor setting where splashing water may occur, ensuring reliability and longevity of the equipment housed within.