What does the cable marking 'OFNR' refer to?

The marking 'OFNR' stands for "Optical Fiber Non-conductive Riser." This designation specifically indicates that the cable is designed for vertical spaces between floors in buildings (riser spaces) and has non-conductive characteristics. The non-conductive aspect is significant because it reduces the risk of electrical hazards in environments where different types of cables are likely to run close to one another.

In installations, using non-conductive cables is crucial for avoiding interference and ensuring safety, especially in multi-tenant buildings or structures with complex cable runs. Therefore, 'OFNR' cables are suitable for areas where there is a potential for water ingress or other environmental conditions that might affect conductive cables.

Understanding the application of 'OFNR' in the context of cable installations helps ensure compliance with local codes and safety standards for cabling systems.