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

Just like copper cables, NEC (National Electrical Code) necessitates indoor fiber optic cables be marked with their fireplace and smoking cigarettes scores. NEC demands all indoor fiber cables be marked effectively and mounted appropriately for its meant use.

In accordance to NEC, a building’s within place is divided into 3 types of sections: plenums, risers and general function places.

:: What is a Plenum place?

A Plenum region is a making space made use of for air stream or air distribution system. In most buildings, the space above a drop ceiling or less than a lifted flooring is used as the air return (resource of air) for the air conditioning. Those people drop ceiling and lifted flooring are also exactly where fiber cables are frequently put in. If these cables ended up burning, they would give off toxic fumes and the fumes would be fed to the relaxation of the setting up by the air conditioner. As a outcome, persons could be wounded even though they are a lengthy way from the fireplace.

:: What is a Riser place?

A Riser region is a ground opening, shaft or duct that operates vertically as a result of 1 or extra floors

:: What is Normal Reason place?

All other spot that is not plenum or riser and on the identical ground is a standard intent location.

:: Fiber Optic Cable Fireplace and Cigarette smoking Ranking Markings

OFNP Cables:

OFNP stands for Optical Fiber Nonconductive Plenum. OFNP cables have fireplace-resistance and small smoke production traits. They can be mounted in ducts, plenums and other areas employed for creating airflow. This is the best fireplace score fiber cable and no other cable kinds can be used as substitutes.

OFCP Cables:

OFCP stands for Optical Fiber Conductive Plenum. OFCP cables have the same fireplace and smoking score as OFNP cables but they have a conducting armor or central strength member which is generally metal. OFCP cables need to be effectively grounded at both equally ends. As a outcome, OFCP cables can not be set up in the very same cable tray or conduit as ability cables.

OFNR Cables:

OFNR stands for Optical Fiber Nonconductive Riser. OFNR cables are employed in Riser areas which are creating vertical shafts or runs from a person ground to an additional floor. OFNR cables can not be put in in plenum spots given that they do not have the necessary fire and smoking ranking as Plenum rated cables. OFNP plenum cables can be utilised as substitutes for OFNR cables.

OFCR Cables:

OFCR stands for Optical Fiber Conductive Riser. OFCR cables have the identical hearth score properties as OFNR cables but they have conducting armor or central strength member which is typically steel. OFCR cables really should also be correctly grounded at each ends. OFCP cables can be applied as substitutes for OFCR cables. OFCR cables can not be put in in the similar cable trays or conduits as energy cables.

OFNG Cables:

OFNG stands for Optical Fiber Nonconductive Typical-Intent. They are normally made use of in horizontal cabling, one flooring apps. OFNG cables can not be made use of in plenums or risers. OFNP and OFNR cables equally can be applied as substitutes for OFNG cables.

OFCG Cables:

OFCG stands for Optical Fiber Conductive Normal-Goal. They have the very same fireplace traits as OFNG cables but they have conducting armor or central strength customers which is ordinarily steel. OFCG cables must be appropriately grounded at both ends. They really should not be mounted in the exact same cable tray or conduits as ability cables.