Archived 2016 Lapp Group International Catalog

Appendix Glossary

ÖLFLEX ® ACCESSORIES FLEXIMARK ® SILVYN ® SKINTOP ® EPIC ® HITRONIC ® ETHERLINE ® UNITRONIC ® APPENDIX Transmission function A light waveguide acts as a low-pass filter for the signals to be trans- mitted. While only continuous wave attenuation is important for low signal frequencies (see also → Attenuation), higher signal frequencies are also attenuated as a result of the dispersion in the light waveguide. The transmission function of a light waveguide makes this a complex issue; however the phase distortion is normally so low that it is suffi- cient to specify the figure for the function. Transmitter, optical Assembly for converting electrical signals into optical signals. It con- sists of a transmission diode with connecting fibre, plug and driver amplifier and other electronic circuits. Particularly in laser diodes, a photodiode with control amplifier is required for monitoring and stabi- lising the radiated power. In many cases, a temperature sensor and a Peltier cooler are also required to stabilise the operating temperature. Where possible, the main components of the transmitter are normally combined into a compact sub-unit known as the transmission module. Triaxial cable Three-conductor cable that is made up of three connected axes. It consists of one conductor in the centre, the second conductor con- centric around the first and the third conductor is isolated from the first two, normally by insulation, a braid and an outer sheath. Trimming Cables are reeled at standard lengths of, for example, 50 m, 100 m and 500 m on cable drums or coils (single cores) and placed in storage. Should a customer require a length shorter than the standard length, the cable is cut to size. The customer is then charged for this adjust- ment. TTP Time Triggered Protocol systems in data technology communicate continu- ously at predefined time intervals. The bandwidth is 5 Mbit/s asynchro- nous and 25 Mbit/s synchronous (see also CAN bus system). Tube cable Coaxial carrier frequency cable with copper inner conductor, PE discs as spacers, a tube-shaped bend copper tape as the outer conductor and a lead or aluminium sheath. They are used as long-distance cables for transmission of TV signals and communications. Twist protection Protection of light waveguide connectors against twisting. Without this protection, the end faces of the light waveguide would be next to one another and become scratched, significantly increasing attenuation. Type test Test to be performed periodically that includes all parameters that can influence the result. This test must be performed again if advance- ments or new developments have been made or the material, technol- ogy or design has been changed. The frequency of type tests is set out in legislation, contracts or operationally. U UL Abbreviation for Underwriters Laboratories. American testing body, similar to the VDE in Germany. UL Approbation for cable glands Approval is particularly required if the machinery or system in which the cable gland has been used is to be exported to the USA. Approval

is granted after a test complying with UL 514B and is confirmed by a certificate. The number of this certificate is known as the “file num- ber” (e. g. E 79903). UL listing mark for listed cables & wires Cables intended for use as fixed wiring in buildings used for residential, commercial or industrial purposes. Listed cables not only have to meet individual UL product standards, but must also comply with the rele- vant articles of the National Electrical Code (NEC). Listed cables and wires can be used both for factory wiring of electrical equipment, devices, appliances and machines as well as for field wiring of industrial machinery and systems in accordance with NFPA 79. Approval marking on the product: (UL) = UL Listing mark. UL recognition mark for AWM cables and wires Appliance wiring material or “AWM” comprises cables intended solely for use in factory-wired electrical equipment, devices, appliances, con- trol cabinets and industrial machinery as part of a “listed assembly”. AWM is not intended for field wiring purposes. Cables with UL AWM style labelling must be used for the applications stipulated by the indi- vidual style designation. Ultraviolet radiation This invisible radiation is the section of the electromagnetic spectrum that is next to the visible range (UV radiation). Underground cable Cables are often designated according to their usage conditions. Under- ground telecommunication cables include outdoor cables designed to be routed underground. Unit conductor of power cables Unit conductors are solely used as large conductors, from approx. 400 square millimetres. In order to reduce the large amount of heat required during welding, the bundles are separated into subconductors during assembly and rejoined again in a new stranding procedure. Unit cores of fiberoptic cables Several coated fibre optic cables lightly undulating and loose in small plastic pipes which are filled with Vaseline or swelling powder. Unit of wires Bare wire bundles are the initial product for copper strands. They are also used as copper strands in wire screens (non-insulated product). V Vagrancy currents Currents that do not flow through the electrical mains (L1, L2, L3, N) are referred to as vagrancy currents. VDE Abbreviation for Verband Deutscher Elektrotechniker e.V., [German Electrical Engineering Federation], VDE testing and certification insti- tute – VDE testing body. VDE Approbation for cable glands Approval is granted after a test complying with DIN/EN 50262 and is confirmed by an approval certificate, UTE Abbreviation for Union Technique de l’Electricité (France).

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