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APPENDIX
For current information see: 1209
Appendix
Glossary
Rubber insulated cable
Cable with rubber sheathing. For example, H05 RR/RN, H07 RR/RN
at Lapp (previously: NMHöu/NSHöu).
S
S-FTP
The structure of shielded foil and braid twisted pair (S-FTP) cables
is made up of a foil screen over all pairs, over which an additional
screen of tin plated copper braiding is placed.
Same direction of lay
See → Stranding
Sample test, screening
Testing of production lengths or production parts in relation to produc-
tion quantity.
Screened cable
Cables with screen in outer layer, over the cores or in double sheath.
The screen can be made from braiding, foil or solid metal. With the foil
version, a drain wire from the filler strand is used. Identified with a “C”,
and with “CY” for additional PVC sheathing if copper braiding used.
Self-extinguishing
Property of a (synthetic) material to extinguish itself when a flame is
removed from the material.
SEMCO
Swedish testing body, similar to the VDE.
Semi-conductor
Materials whose electrical conductivity depends on various influences,
e. g. current direction, temperature, incidence of light. By mixing with
conductive materials (carbon, graphite), insulating materials (PVC) can
be modified to give semiconductor properties.
Semiconductor bandgap
Energetic distance between the valence band and the conduction band
of a semiconductor.
Separating layer
Foils positioned between the individual layers on the cable core to
prevent harmful influences.
Separator
Polyethylene terephthalate foils are used in the cable industry as insu-
lating foils. They have excellent dielectric and mechanical properties.
They are used as separating foils in PVC insulated cables.
SEV
Abbreviation for Schweizerischer Elektrotechnischer Verein [Swiss
Electrical Engineering Association], testing body similar to the VDE.
Sheath print
The customer receives information about the printing of cable sheaths
regarding design, testing- and operation- related markings, colour
codes, customer-specific markings and manufacturer markings. The
prints are created using laser and ink-jet printers or print wheels. They
are, however, of inferior quality to the embossed letters as they wear
away relatively quickly or can be rubbed off.
Sheathed cable
Designation for NYM and other sheathed cables.
Shielding
A cover made of conductive material that is placed over an individual
core, a group of cores or all cores in a cable. Screening is used
to protect the cable against penetration by electrical and/or magnetic
fields and to prevent electrical interference from escaping from
a cable. Screening takes various forms: a copper wire braid or → cov-
ering, copper or aluminium foil wrapping or enclosed tubular copper or
aluminium bodies. For the screening, the covering density is defined in
percent, relative to the area located below the braiding.
Shipping reels
The correct choice of shipping reel is a crucial factor in the quality of
a cable from winding to installation. The reel size and thus the winding
volume is determined by the diameter and length of the material to be
wound and the mass of the cable. The delivery agreement between the
manufacturer and the customer is determined by the diameter and
mass from the production design and the product length. It is critical
that the bending radius of the cable, which determines the size of the
reel core, is maintained.
Shore
Hardness of the cable sheath. The definition is: The resistance to pene-
tration by another body, which is measured without exception before
the occurrence of damage. Shore A test is used for soft plastics, Shore
D test for harder plastics.
SIA
Swiss format for invitations to tender.
Signal cable
Signal cables are used to control the accuracy and precision of electric
motors. (For example, ÖLFLEX ® connecting and control cables, ÖLFLEX®
SERVO, UNITRONIC ® data cables at Lapp).
Single conductor
Conductor which, unlike a strand, consists of just a single wire. A rigid
wire is suitable for fixed installation.
Single wire
See → Cable, single-wire.
Single-mode fibre
Waveguide in which only a single mode can be propagated at the oper-
ating wavelength.
Single–wired conductor
A single-wire conductor consists of just one wire.
Skin effect
The higher the frequency of the effective or interference signal, the more
the high frequency current is pushed towards the surface. The skin
effect is the property of an alternating or high frequency current in
a conductor to move towards the surface due to field line induction
processes. This limits the penetration depth of an external electromag-
netic field into the object and thus its effectiveness inside.
Slave
Subscriber in a network that can only communicate in data exchange
when addressed by the master (see → ASI).
SNA
Abbreviation for System Network Architecture. Network architecture
concept that enables data to be transmitted between different types of
computer.