Just like copper cables, NEC (Countrywide Electrical Code) involves indoor fiber optic cables be marked with their hearth and cigarette smoking scores. NEC involves all indoor fiber cables be marked the right way and mounted correctly for its intended use.
In accordance to NEC, a building’s within space is divided into three types of sections: plenums, risers and general function areas.
:: What is a Plenum space?
A Plenum space is a setting up place applied for air move or air distribution system. In most structures, the space above a fall ceiling or beneath a raised flooring is applied as the air return (supply of air) for the air conditioning. These fall ceiling and raised flooring are also in which fiber cables are typically mounted. If all those cables have been burning, they would give off harmful fumes and the fumes would be fed to the rest of the setting up by the air conditioner. As a consequence, people today could be hurt even while they are a very long way from the hearth.
:: What is a Riser space?
A Riser space is a flooring opening, shaft or duct that operates vertically via a single or much more flooring
:: What is Normal Intent space?
All other space that is not plenum or riser and on the same flooring is a general function space.
:: Fiber Optic Cable Fireplace and Cigarette smoking Score Markings
OFNP stands for Optical Fiber Nonconductive Plenum. OFNP cables have hearth-resistance and minimal smoke production features. They can be mounted in ducts, plenums and other areas applied for setting up airflow. This is the best hearth ranking fiber cable and no other cable types can be applied as substitutes.
OFCP stands for Optical Fiber Conductive Plenum. OFCP cables have the same hearth and cigarette smoking ranking as OFNP cables but they have a conducting armor or central energy member which is commonly steel. OFCP cables have to be correctly grounded at each ends. As a consequence, OFCP cables can not be mounted in the same cable tray or conduit as ability cables.
OFNR stands for Optical Fiber Nonconductive Riser. OFNR cables are applied in Riser areas which are setting up vertical shafts or operates from a single flooring to another flooring. OFNR cables can not be mounted in plenum areas since they do not have the necessary hearth and cigarette smoking ranking as Plenum rated cables. OFNP plenum cables can be applied as substitutes for OFNR cables.
OFCR stands for Optical Fiber Conductive Riser. OFCR cables have the same hearth ranking features as OFNR cables but they have conducting armor or central energy member which is commonly steel. OFCR cables ought to also be correctly grounded at each ends. OFCP cables can be applied as substitutes for OFCR cables. OFCR cables can not be mounted in the same cable trays or conduits as ability cables.
OFNG stands for Optical Fiber Nonconductive Normal-Intent. They are usually applied in horizontal cabling, one flooring apps. OFNG cables can not be applied in plenums or risers. OFNP and OFNR cables each can be applied as substitutes for OFNG cables.
OFCG stands for Optical Fiber Conductive Normal-Intent. They have the same hearth features as OFNG cables but they have conducting armor or central energy users which is usually steel. OFCG cables ought to be correctly grounded at each ends. They ought to not be mounted in the same cable tray or conduits as ability cables.
Source by Colin Yao