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S. Heavy
duty, rubber-insulated portable cord. Stranded copper
conductors with separator and individual rubber insulation.
Two or more color coded conductors cabled with filler,
wrapped with separator and rubber jacketed overall. 600V.
SDN. Small diameter multi-conductor control
cable with neoprene jacket and nylon sheath over polyethylene
insulation.
Secondary Insulation. A high resistance
dielectric material which is placed over primary insulation
to protect it from abrasion.
Selenium Cure. Process used to cure neoprene
and rubber jacketed wires and cables.
Self Extinguishing. The characteristic
of a material whose flame is extinguished after the igniting
flame is removed.
Semi-Conducting Tape. A tape of such
resistance that when applied between two elements of a
cable, the adjacent surfaces of the two elements will
maintain substantially the same potential.
Semiconductor. A material that has a
resistance characteristic between that of insulators and
conductors.
Semi-Rigid PVC. A hard semi-flexible
polyvinylchloride compound with low plasticizer content.
Separator. A layer of insulating material
such as textile, paper, polyester, etc. Used to improve
stripping qualities, flexibility, mechanical or electrical
protection to the components.
Serve. A filament or group of filaments
such as fibers or wires, wound around a central core.
Sheath. The outer covering or jacket
of a multiconductor cable.
Shield. A metallic layer placed around
a conductor or group of conductors to prevent electrostatic
interference between the enclosed wires and external fields.
Shield Coverage. The physical area of
a cable that is actually covered by the shielding material
and is expressed in percent.
Shield Effectiveness. The relative ability
of a shield to screen out undesirable signals.
Shield Percentage. The physical area
of a circuit or cable actually covered by shielding material,
expressed in percent.
Shock Test. A test to determine the ability
of a cable to withstand a violent physical concussion
such as might occur during handling or use.
Shore Hardness. An instrument measure
of the surface hardness of an insulating or jacket material.
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.
Sintering. Fusion of a spirally applied
tape wrap jacket by the use of high heat to a homogeneous
continuum. Usually employed for fluorocarbon, nonextrudable
materials.
Skin Effect. The tendency of alternating
current, as its frequency increases, to travel only on
the surface of a conductor.
Solid Conductor. A single unit not divided
into parts.
Spacing. Distance between the closest
edges to 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 (in cables having flat conductors),
or the distance between the centers of the first and last
conductors (in cables having round conductors), expressed
in inches or centimeters.
Spark Test. A test designed to locate
imperfections (usually pin-holes) 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.
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.
Stranding Wave. The stationary pattern
of waves produced by two waves of the same frequency traveling
in opposite directions on the same transmission line.
The existence of voltage and current maxima and minima
along a transmission line is a result of reflected energy
from an impedance mismatch.
Standing Wave Ratio (SWR). A 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.
Strand. A single uninsulated wire.
Stranded Conductor. A conductor composed
of individual groups of wires twisted together to form
an entire unit.
Strip Force. The force required to remove
a small section of insulating material from the conductor
it covers.
Suggested Working Voltage. AC voltage
that can be applied between adjacent conductors.
Surface Resistivity. The resistance of
a material between two opposite sides of a unit square
of its surface. It is usually expressed in ohms.
Surge. A temporary and relatively large
increase in the voltage or current in an electric circuit
or cable. Also called transient.
Sweep Test. A method to determine the
frequency response of a cable by generating an RG voltage
whose frequency is varied at a rapid constant rate over
a given range.
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