Which enclosure type would be suitable for indoor use that is subject to splashing water?

The selection of enclosure type B is appropriate because it is designated as being "Watertight" and suitable for indoor applications where it may be subject to splashing or dripping water. Enclosure type 4, which is the correct choice in contexts involving water exposure, indicates that it is intended to protect against water splashing from any direction. This makes it suitable for environments like kitchens or laboratories where water can accidentally come into contact with electrical equipment.

Enclosure type B is designed specifically for situations where moisture, splashes, or occasional water exposure is a concern, providing appropriate protection against water ingress. Having a robust design and materials, these enclosures can withstand the impact of splashing water while ensuring that the electrical components within remain safe and operable.

In contrast, enclosure types that do not meet these criteria would not offer the necessary protection. For instance, other enclosure types may not have the sealing or structural integrity needed for wet environments.