What are OFNP, OFNR, OFNG and OFCG? Understanding Fiber Optic Cable Fire Ratings

Just like copper cables, NEC (National Electrical Code) demands indoor fiber optic cables be marked with their fire and smoking cigarettes ratings. NEC demands all indoor fiber cables be marked properly and mounted adequately for its supposed use.

In accordance to NEC, a building’s inside of space is divided into three varieties of sections: plenums, risers and standard intent locations.

:: What is a Plenum space?

A Plenum space is a creating place employed for air stream or air distribution process. In most properties, the space higher than a drop ceiling or underneath a raised flooring is employed as the air return (supply of air) for the air conditioning. Those drop ceiling and raised floors are also wherever fiber cables are generally mounted. If individuals cables ended up burning, they would give off toxic fumes and the fumes would be fed to the relaxation of the creating by the air conditioner. As a consequence, men and women could be hurt even even though they are a extended way from the fire.

:: What is a Riser space?

A Riser space is a flooring opening, shaft or duct that operates vertically by way of one particular or additional floors

:: What is Common Purpose space?

All other space that is not plenum or riser and on the very same flooring is a standard intent space.

:: Fiber Optic Cable Hearth and Smoking cigarettes Rating Markings

OFNP Cables:

OFNP stands for Optical Fiber Nonconductive Plenum. OFNP cables have fire-resistance and reduced smoke creation properties. They can be mounted in ducts, plenums and other spaces employed for creating airflow. This is the optimum fire ranking fiber cable and no other cable varieties can be employed as substitutes.

OFCP Cables:

OFCP stands for Optical Fiber Conductive Plenum. OFCP cables have the very same fire and smoking cigarettes ranking as OFNP cables but they have a conducting armor or central energy member which is generally steel. OFCP cables have to be adequately grounded at equally ends. As a consequence, OFCP cables can not be mounted in the very same cable tray or conduit as energy cables.

OFNR Cables:

OFNR stands for Optical Fiber Nonconductive Riser. OFNR cables are employed in Riser locations which are creating vertical shafts or operates from one particular flooring to a different flooring. OFNR cables can not be mounted in plenum locations considering the fact that they do not have the demanded fire and smoking cigarettes ranking as Plenum rated cables. OFNP plenum cables can be employed as substitutes for OFNR cables.

OFCR Cables:

OFCR stands for Optical Fiber Conductive Riser. OFCR cables have the very same fire ranking properties as OFNR cables but they have conducting armor or central energy member which is generally steel. OFCR cables should really also be adequately grounded at equally ends. OFCP cables can be employed as substitutes for OFCR cables. OFCR cables can not be mounted in the very same cable trays or conduits as energy cables.

OFNG Cables:

OFNG stands for Optical Fiber Nonconductive Common-Purpose. They are usually employed in horizontal cabling, single flooring purposes. OFNG cables can not be employed in plenums or risers. OFNP and OFNR cables equally can be employed as substitutes for OFNG cables.

OFCG Cables:

OFCG stands for Optical Fiber Conductive Common-Purpose. They have the very same fire properties as OFNG cables but they have conducting armor or central energy members which is usually steel. OFCG cables should really be adequately grounded at equally ends. They should really not be mounted in the very same cable tray or conduits as energy cables.



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