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APPENDIX
For current information see: 1197
Appendix
Glossary
Coaxial cable
Concentric pair of conductors consisting of an inner conductor and an
outer conductor, which completely surrounds the inner conductor.
Coaxial cables are suitable for low-attenuation and distortion free
transmission of high bandwidth signals. Because of their self-screening
construction, they are much less sensitive to external interference
(e. g. RG coaxial cable at Lapp). Coaxial cables are used in high fre-
quency telecommunications systems (cable TV, Ethernet applications)
for transmission of high frequency signals.
Colour code
For uniform marking of metallic cables and waveguides, various insti-
tutions including the EIA, DIN and IEC, have developed a standardised
colour coding system. The colour codes for metallic cores assign totally
different colours to the insulation of the pairs of cores for the individual
standards. In addition to these standards, which are not consistently
applied by manufacturers, colour codes specific to the manufacturer
are often used.
Colour print
Sheaths and insulation covers are usually printed with colour, using
a metallic disc whose lettering is engraved inversely on its periphery.
Using a scraper, the excess colour can be scraped away.
Communication
Interaction between two independent systems. Used for one-way
or two-way exchange of messages in the form of voice, text, images
or data.
Compensating cable
Compensating cables are used together with a thermal element for
temperature measurements. (Thermal elements such as Fe/CuNi
iron-constantan (blue); NiCr/Ni nickel- chromium-nickel (green); PtRh/
Pt platinum-rhodium-platinum (white). A thermal element consists of
two conductors made from different materials, between which there is
an electric potential depending on temperature. A compensating cable
transmits this potential from the thermal element to a cold junction.
There, based on the value of the potential, the temperature can be
assigned at the point of measurement.
Composite layer, composite sheath
The combination of an aluminium foil with the plastic/ polyethylene
sheath of a cable. The foil covers the core of the cable lengthways and
overlapping, while the plastic part is placed on the outside. The outer
sheath extruded onto it forms a homogeneous connection with the foil
due to the effect of temperature, resulting in an interconnected “lami-
nated” aluminium foil sheath. Used in outdoor telecommunications
cables.
Compound
A material compound of polymer plastics with filler. Polymers are often
compounded with colours, processing aids, fibres and other fillers.
Concentric conductor
The concentric conductor (e. g. NYCWY) may be used as a PE or PEN
wire and can also act as the screening.
Conditioning
Division of production length of cables into storage or delivery lengths.
Standard forms include coils with lengths of 50, 100 and 250 m and
drums with 250, 500 and 1,000 m, depending on weight.
Conductance
The electrical conductivity is the inverse of the electrical resistance.
Conductor
Single-conductor cables are single- or multi-wire cables, used mainly
for fixed laying with rubber or plastic insulation (ground wire). A non-
insulated wire of a material whose high number of free electrons makes
it suitable for carrying electric current (particularly copper and alumin-
ium). Component allowing a connection that is easy to break and
reestablish between two light waveguides. The insertion loss from
a connector is normally higher than that from a splice. In signal and
power engineering, connectors are used for connecting cables with
different numbers of poles and in a variety of different designs.
Because of the associated ease of service compared to fixed cable
connections, connectors are being used in an increasing number of
applications. (e. g. EPIC® at Lapp). Plugs are components that enable
electrical conductors to be connected and are designed to create
detachable electrical connections with an appropriate counterpart.
Plugs may not be inserted or removed during proper use (under elec-
trical voltage). A distinction is made between free and fixed plugs
according to the mounting. The plug is made up of the plug housing
and the contact elements. (e. g. EPIC® brand from Contact at Lapp).
Central component for star-shaped passive light waveguide networks. It
connects numerous transmitters and receivers and distributes the
signal light output supplied by a connected transmitter evenly to all
connected receivers.
Contact voltage
Part of an error voltage which may be contacted by members of the
general public.
Control cable
The Lapp ÖLFLEX® brand is synonymous with connecting and control
cables. The key features of control cables are: Bare or tin plated fine
copper wire conductors, PVC insulation, stranding of cores with back
twist, special PVC compound outer sheath. Different ÖLFLEX ® designs
include:
a) Different coloured cores,
b) Numbered cables. ÖLFLEX ® cables have the following properties:
Flexible, largely resistant to all kinds of oils, alkalis and acids.
ÖLFLEX® are used in the following areas: As control cables in
machine tool manufacture and general engineering, plant construc-
tion, in all kinds of industrial plants, in measurement and control
engineering, process engineering, data processing etc. ÖLFLEX®
control cables are highly recommended for these applications due to
their excellent flexibility, the good general chemical resistance, the
clear core coding and the problem-free compatibility with multi-pole
machine connectors.
Copolymere
Mixture which polymerises from two or three monomers to form
a chain.
Copper
The best material for producing electrical conductors. Excellent con-
ductivity of heat and electricity. In addition, copper (Cu) has very good
ductility and good strength properties.
Copper base
The monetary value used to value the copper contained in cables in the
price.
Copper weight
It expresses the mass of the copper contained in the cables.
Copper-clad aluminium wire
This wire is made up of an aluminium core and a copper sheath.