What is the definition of rainproof in electrical installations?

Rainproof in electrical installations refers specifically to the design aspect that ensures rain cannot interfere with the functioning of electrical apparatus during test conditions. This definition emphasizes the operational reliability of equipment exposed to rain, signifying that the involved components must be capable of maintaining their performance even when subjected to water exposure.

The focus on test conditions illustrates that the criteria for rainproofing assess the operational integrity of an electrical system or device while it is being evaluated, not just its physical durability. This distinction is important because it implies the need for both protective measures and functional checks to ensure that the equipment meets safety and operational standards.

Other options suggest related concepts, such as construction methods for corrosion prevention or sealing against moisture, but they do not encapsulate the specific definition of rainproof as it pertains to the operational capability of electrical equipment in rainy environments. The understanding of this term is crucial for ensuring that electrical installations are safe, reliable, and compliant with standards designed to protect against water ingress.