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Term Description
OFC/OFNDesignation of Fiber Optic cable which meets Steiner Tunnel test
OFCR/OFNRDesignation of Riser Fiber Optic cable which meets Riser flame test
OhmUnit of resistance such that a constant current of one ampere produces a force of one volt
OSHAAbbreviation for Occupation Safety and Health Act. Specifically the Williams-Steiger law passed in 1970 covering all factors relating to safety in places of employment
Overall DiameterFinished diameter over wire or cable
OvercoatIndividual strands of tin copper wire stranded together and then covered with a tin coating
OverlapThe amount the trailing edge laps over the leading edge of a tape wrap
Oxygen IndexPercentage of oxygen necessary to support combustion of a specified material
OzoneA highly active form of oxygen produced by the passage of electric discharges or sparks through air or oxygen