OFCR - Abbreviation for optical fiber conductive riser cable.
OFFGASSING - Percentage of a specified gas released during the combustion of an insulating or jacketing material.
OFHC - Abbreviation for oxygen free, high conductivity copper. It has no residual deoxidant, 99.95% minimum copper content and an average annealed conductivity of 100%.
OFN - Abbreviation for optical fiber non conductive general purpose cable.
OFNG - Abbreviation for optical fiber non conductive fire resistant general purpose cable.
OFNP - Abbreviation for optical fiber non conductive plenum cable.
OFNR - Abbreviation for optical fiber non conductive riser cable.
OHM - The unit of measure for electrical resistance, reactance, and impedance. A constant current of one ampere produces a force of one volt. Symbol Ù.
OHM (300) LEAD WIRE - Television lead-in wire. Leads signal in from the antenna to the set.
OHM’S LAW - The electric current,
I, flowing in a conductor or resistor is linearly proportional to the applied difference,
V, across it. From the definition of resistance,
R, Ohm’s law can be written:
V = IR (i.e.,Volts = Current x Resistance.)
OIL FILLED CABLE - Paper insulated, lead sheathed cable, into which high grade mineral oil is forced under pressure, saturating the insulation. The main object is to prevent moisture and gases from entering. It is also easier to detect flaws due to leakage, as the oil is kept under constant pressure at all times.
OIL FILLED PIPE CABLE - Basically the same as oil filled cable, but inside of rigid pipe instead of lead sheath. Sometimes it is a standard oil filled cable inserted into rigid pipe under pressure, both units being oil filled. Usually for much higher voltage where constant pressure is maintained at all times.
