Term | Description |
---|---|
Semi-Rigid PVC | A hard semi-flexible polyvinyl chloride compound with low plasticizer content |
Semiconductor | A material that has a resistance characteristic between that of insulators and conductors |
Separator | A layer of insulating material such as textile, paper, polyester, etc. Used to improve stripping qualities and flexibility and to provide mechanical or electrical protection to the underlying components. |
Serve | A filament or group of filaments such as fibers or wires that are wound around a central core |
Served Wired Armor | Spiral wrap of soft galvanized steel wires wrapped around a cable to afford mechanical protection and increase the cable pulling tension characteristics |
Sheath | The outer covering or jacket of a cable |
Shield | A metallic layer placed around a conductor or group of conductors to prevent electrostatic interference between the enclosed wire and external fields |
Shield Coverage | The physical area of a cable that is optically covered by the shielding material (expressed in percent) |
Shield Effectiveness | The relative ability of a shield to screen out undesirable signals |
Shock Test | A test to determine the ability of a cable to withstand a violent physical concussion that might occur during handling or use |
Signal | A current used to convey information, either digital, analog, audio or video |
Signal Cable | A cable designed to carry current of usually less than one ampere per conductor |
Silicone | Any class of synthetic materials which are polymers with a chemical structure based on chains of silicon and oxygen atoms, with organic groups attached to the silicon atoms. Used as both insulation and jacket, with operating temperature range of -65°C to 200°C. |
Silver Coated Copper | A type of copper that is used in high frequency applications where the higher conductivity of silver is desired |
Sintering | Fusion of a spirally applied tape wrap jacket by the use of high heat to a homogeneous continuum; usually employed for fluorocarbon, non-extrudable materials |
Skin Effect | The tendency of alternating current, as its frequency increases, to travel only on the surface of a conductor |
SNM | A cable designed for use in hazardous locations consisting of insulated conductors in an extruded nonmetallic jacket which is then covered with an overlapping spiral metal tape & wire shield |
Solid Conductor | A conductor consisting of a single strand of wire |
Solid PE | Polyethylene available in several forms: linear low-density polyethylene (LLDP), low density polyethylene (LDP), medium density polyethylene (MDP), high-density polyethylene (HDP) |
Spacing | Distance between the closest edges of two adjacent conductors |
Span | In flat cables, the distance from the reference edge of the first conductor to the reference edge of the last conductor, or the distance between the centers of the first & last conductor expressed in inches or centimeters |
Spark Test | A test designed to locate imperfections (usually pinholes in the insulation of a wire or cable by application of a voltage for a very short period of time while the wire is being drawn through the electrode field) |
Specific Gravity | The ratio of the density (mass per unit volume) of a material to that of water |
Specific Inductive Capacity (S.I.C.) | See definition for "Dielectric Constant" |
Spiral Shields | A type of shield made up of single strands of wires spirally wrapped around a conductor or cable core, more flexible and easier to terminate than woven braid. Typically has a nominal coverage of 95% to 98%. |
Spiral Wrap | The helical wrap of a material over a core |
Stability Factor | The difference between the percentage power factor at 80 volts/mil and at 40 volts/mil measured on wire immersed in water at 75C for a specified time |
Standing Wave | The stationary pattern of waves produced by two waves of the same frequency traveling in opposite directions on the same transmission line |
Standing Wave Ratio (SWR) | The ratio of the maximum amplitude to the minimum amplitude of a standing wave (stated in current or voltage amplitudes) |
Static Condition | Used to denote the environmental conditions of an installed cable rather than the conditions existing during cable installation |
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