General
Nominal voltage	300/500 V
Test voltage	2000 V
Installation temperature range	+5 °C - +70 °C
Temperature range after installation	-30 °C - +70 °C
Operation temperature	+70 °C
Bending radius	15 x cable diameter
Flame retardancy	according to VDE 0472 T. 804, test type B (=IEC 332-1)
Conductor	Copper bare, solid
Insulation	PVC according to VDE 0207
Sheath colour	Red
Colour coding	according to VDE 0293-308

The H05V-U 0.75RT is a PVC-insulated wiring cable from manufacturer Norbert Kordes, designed for internal wiring of devices as well as for protected installations in and on luminaires, in conduits, on and under plaster. The cable is specifically intended for use in doorbell and signaling systems. It features a single-core, bare copper conductor and PVC insulation in accordance with VDE 0207, with the sheath color defined according to VDE 0293-308. The red color corresponds to the standardization for specific application areas in electrical installations.

Applications
This cable is suitable for use in enclosed devices, such as household appliances, lighting units, or signaling systems. It is appropriate for installations in conduits, in pipes, or under plaster, provided that the installation is carried out only in protected areas. Its use is limited to systems that do not require higher electrical loads, particularly for doorbell and signaling systems, where the rated voltage of 300/500 V is sufficient.

Functions and Features in Detail
The cable consists of a single-core, bare copper conductor, ensuring a stable electrical connection. The PVC insulation provides sufficient protection against electrical discharges and mechanical stress. The red sheath color is standardized according to VDE 0293-308, enabling clear identification and assignment in installation environments. The cable is not flexible but rigid, making it suitable for use in fixed installations.

Technical Explanation
The rated voltage of 300/500 V means the cable is designed for voltages up to 500 V between conductor and earth and up to 300 V between two conductors. The test voltage of 2000 V serves as a safety check and ensures the insulation remains stable even under increased voltage. The maximum operating temperature is +70 °C, and the cable may be installed during installation at temperatures ranging from +5 °C to +70 °C. After installation, the ambient temperature may briefly drop to -30 °C without damaging the cable. The minimum bending radius is 15 times the cable diameter, which must be considered during installation to avoid cracks in the insulation. The flame retardancy according to VDE 0472 T. 804, test method B (equivalent to IEC 332-1), ensures that the cable is only limitedly flammable and does not propagate flames when exposed to fire.

Compatibility and Accessories
The cable is designed for use in standard installations, particularly in combination with other components for doorbell and signaling systems. It can be used in conjunction with suitable connectors, terminals, or switches designed for the same voltage class. Use in open or unprotected areas is not intended, as the cable is not designed for external influences such as moisture or mechanical stress.

Installation and Mounting
Installation must be carried out within the specified temperature range. The cable may only be installed in protected areas, for example in conduits, pipes, or under plaster. The minimum bending radius of 15 times the cable diameter must be observed to ensure the integrity of the insulation. Installation is performed without additional protective measures, as the PVC insulation already provides the required mechanical and electrical safety.

Operational Advantages
The H05V-U 0.75RT offers a reliable electrical cable with good insulation quality and sufficient mechanical strength for its intended applications. The flame retardancy according to VDE 0472 T. 804, test method B, increases operational safety. The clear color coding according to VDE 0293-308 facilitates identification and maintenance of the installation. The cable is particularly suitable for use in signaling and doorbell systems, where a stable but not excessively stressed connection is required.