OPTICAL TRANSMITTER - Unit for converting electrical signals into optical signals.
OSHA - Abbreviation for Occupational Safety and Health Act.
OUTGASSING - The dissipation of gas from a dielectric evidencing decomposition.
OVERCOAT - Individual strands of tin copper wire stranded together and then covered with a tin coating.
OVERHEAD LINE - Synonymous with open wire. A conductor that is not surrounded by insulation and is supported separately above ground.
OVERLOAD - Any load delivered at the output of an electrical device, circuit, machine, or other apparatus that exceeds the rated output of the equipment.
OXIDIZE - To change (a compound) by increasing the proportion of the electronegative part or charge (an element or ion) from a lower to a higher positive valence; remove one or more electrons from an atom, ion, or molecule.
OXYGEN BOMB TEST - To determine aging effect, heat, tensile strength, and elongation of wire. The wire is placed in a bomb at 70° C, under 300 psi using pure oxygen gas for a period of 48 to 96 hours.
OXYGEN INDEX - Percentage of oxygen necessary to support combustion of a specified material.
OZ - Abbreviation for ounce.
OZONE - Form of oxygen produced by discharge of electricity into air. Chemical symbol O2.
