What is a “Submersible” rubber cable and how deep can it go?

Standard H07RN-F can handle occasional immersion. However, for permanent use in wastewater pumps or boreholes, specialized Submersible Rubber Cables (often rated as H07RN-8-F) are used. These are tested for continuous submersion at depths typically ranging from 10 to 100 meters, featuring enhanced longitudinal water-blocking properties.