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| Term | Description |
|---|---|
| Unilay | More than one layer of helically laid wires where the direction and length of lay are consistent for each layer |
| UV Resistance | The ability of a material to resist ultra violet (UV) light, or sunlight |
| Valley | Any void between the insulated conductors of a cable or between a cable and its core. See Interstices. |
| Velocity of Propagation (VP) | The speed a signal travels down a length of cable as compared to the speed in free air and is directly dependent upon the dielectrical material properties |
| VHF | Abbreviation for Very High Frequency (30 to 300 MHz) |
| Video Pair Cable | A transmission cable containing low-loss pairs with an impedance of 125 ohms; used for TV pick ups, closed circuit TV, telephone carrier circuits, etc. |
| Volt | A unit of electrical pressure. One volt is the amount of pressure that will create one ampere of current in one ohm of resistance. |
| Voltage | Electrical potential or electromotive force expressed in volts |
| Voltage rating | The highest voltage that may be continuously applied to a wire in conformance with standards or specifications |
| Voltage Standing Wave Ration (VSWR) | The ratio of the maximum effective voltage to the minimum effective voltage; measured along the length of a mis-matched radio frequency transmission line |
| Volume Resistivity(Specific Insulation Resistance) | The electrical resistance between opposite faces of a 1 cm. cube of insulation material; commonly expressed in ohms-cm |
| Vulcanization | An irreversible process in which a rubber or polymeric compound becomes thermoset through changes to its chemical structure (for example, cross-linking) |
| VW-1 | A flammability rating established by Underwriters Laboratories for wires and cables that pass a specifically designed vertical flame test; formerly designated FR-1 |
| Wall thickness | The thickness of applied insulation or jacket |
| Water Absorption | The percentage of water weight absorbed by a material after a given immersion period |
| Watt | A unit of electrical power. One watt is equivalent to the power represented by one ampere of current under a pressure of one volt in a DC circuit |
| Wavelength | The distance of a repetitive electrical pulse or waveform between two successive points; measured in the direction of propagation |
| WEEE | The abbreviation for Waste Electrical & Electronic Equipment. This makes the manufacturer responsible for disposal of products that have reached the end of life status. |
| Wicking | The longitudinal flow of liquid in a wire or cable due to capillary action |
| Wind Turbine Tray Cable | UL (Underwriter's Laboratories)Standard 2277; National Electrical Code (NEC) Article 336 of NFPA 70 |
| Wire | A single conductor, typically includes a covering of insulation |
| Wire Gauge | A measure of the diameter of sizes of wires. The sizes are expressed by numbers. |
| Working Voltage | See definition of "Voltage Rating" |
| XLP | Crosslinked polyethylene |
| Yield Strength | The minimum stress at which a material will start to physically deform without further increase in load |
| Z-Fold | A type of fold that is a combination of metal-to-metal contact with the addition of an isolation fold |
| Zytel | DuPont's trade name for nylon resins |
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