Which construction type ensures that exposure to beating rain will not allow water to enter?

The correct choice is raintight, which refers to a construction type designed specifically to prevent water from entering during exposure to beating rain. This characteristic is crucial in ensuring that structures, equipment, and electrical installations can withstand adverse weather conditions without suffering from water damage.

Raintight constructions are typically equipped with features such as properly sealed joints, gaskets, and adequate drainage pathways that direct water away, thereby safeguarding the integrity of the system inside from moisture intrusion.

The other terms, while related to water resistance, convey different meanings. Waterproof generally implies complete resistance to water, while watertight suggests a high degree of impermeability to water under pressure, which might not be necessary for just protection against rain. Moisture-proof indicates a barrier against moisture but does not specifically address rain or the force associated with it. Thus, raintight is the most precise term for protection against beating rain ingress.