Cable manufacture

Vertica.1 Axia.1 Deposition. The vertical axial deposition (VAD) process (18) was developed by a consortium of Japanese cable manufacturers and Nippon Telephone and Telegraph (NTT). This process also forms a cylindrical soot form. However, deposition is achieved end-on without use of a mandrel and subsequent formation of a central hole. Both the core and cladding are deposited simultaneously using more than one torch (Fig. 12). 

P. R. Dickinson, "Evolving Fire Retardant Matedals Issues A Cable Manufacturer s Perspective," Fire Technol (Nov. 1992). 

The selection process of power cables is almost the same as that of a bus system discussed in Section 28.3. For simplicity we consider only the basic data for selection which would suffice the majority of applications. For accurate calculations a similar approach will be essential as for the bus systems (Chapter 28). For site conditions and laying arrangements which may influence the basic rating of a cable, corresponding derating factors have also been provided. The information covered here will be useful to users to meet their cable requirements, although the data may vary marginally for different manufacturers. For more data on cables, not covered here, reference may be made to the cable manufacturers. 

This value can be determined from the data available on a per km basis in cable manufacturers catalogues and as provided in the previous tables. For the given a.c. resistance and inductive reactance it can be determined by ... 

This plays an important role and requires utmost care. While termination of LT PVC cables is easier with the help of a crimping tool, HT cables need a proper kit for jointing and end termination. The jointing material is also manufactured by the cable manufacturers. We are not providing details of these kits and their jointing procedures. These can be obtained from manufacturers catalogues. 

Resistance of the cable from the pipeline to the power source and from the power source to and along the anodes comprising the groundbed. This cable resistance must be determined from the standard tables supplied by the cable manufacturer. 

Continuous vulcanisation units are of a number of types. See also the section on Cable Manufacturing. 

The respondents who showed the most interest in life prediction were cable manufacturers, electrical distribution authorities, gas distribution authorities, nuclear power station designers and operators, and the aircraft industry. Interest was less, but nevertheless increasing, among the manufacturers of small electronic and electrical equipment and computers, many of whom use polymers principally for housings and similar components. 

To achieve this goal, MED restructured its operations, concentrating on manufacturing, work force, and internal group structures. The first step was to achieve a significant reduction of manufacturing capacity. To do this, the company reduced the scope of the activities that were handled internally. Many low-value-added steps - such as basic parts or cable manufacturing - were outsourced. 

An excess mortality of cirrhosis of the liver was observed in 9028 workers employed from 1940 to 1944 at a cable manufacturing plant with chlorinated naphthalene exposure. Cirrhosis deaths were similarly elevated in a subcohort of 460 individuals who had shown symptoms of chloracne. A cancer mortality study of this same subcohort found an excess of two rare causes of death, malignant neoplasm of the esophagus and benign and unspecified neoplasms. ... 

Ward EM, Ruder AM, Suruda A, Smith AB, Fessler-Flesch CA, Zahm SH Cancer mortality patterns among female and male workers employed in a cable manufacturing plant during World War II. JOM 36(8) 860-866, 1994... 

These high dielectric characteristics in combination with high heat resistance account for the wide application of silicone elastomers in the production of rubberised wires and cables. At present there are several types of cables manufactured from these materials ... 

Within that framework, the most effective constructions to meet existing requirements have been developed based on a variety of polymers including poly(vinyl chloride) (PVC), polyolefins, silicones, and fluoropolymers. Researchers are continually striving to develop more cost-effective compositions and cable constructions to enable replacement of more expensive materials with less expensive ones. In some cases, OEMs, cable manufacturers, and material suppliers are working to pass new standards that allow for substitution of new classes of materials or designs. 

Strong push by some fluoropolymer suppliers and fluoropolymer cable manufacturers for adoption of specific standards that promote use of fluoropolymers (e.g., proposed limited combustible Plenum rating in the United States)... 

Insulating material in capacitors and cable manufacturing. Halowax 1051 is a technical mixture, the octachloronaphthalene is the primary and target component. 

The Ki-value determination of PVC cable compounds The specific volume resistivity is the most important electrical property of an electrical grade PVC. It is measured on a heavily plasticised product, the cable compound, pressed to a 2 mm. thick sample sheet. Cable manufactures usually test the resistivity of these compounds on cable samples and express the results in a so-called Ki-value. The Ki-value is in fact a volume resistivity value (see below) but measured on a cable sample with tapwater as low potential measuring electrode. A series of Ki-value determinations was performed to investigate the different parameters influencing this quantity. 

The main variable during these type of measurements is the temperature. Figure 5.20 shows that the Ki-values of an ex-Dorlyl cable, decrease from 331 Mega-Ohm.km at 20°C to 1.2 Mega-Ohm.km at 80°C. It is hence not surprising that the measuring temperature of the Ki-value is specified by every cable manufacturer. 

When high voltage motors are being considered, it is usually found that the minimum conductor size of the cable is determined by the let-through fault withstand capability rather than the full-load or starting current. Cable manufacturers provide graphical data for fault withstand capabilities of their cables, which are based on practical tests. These aspects are also associated with the protection system used for the motor, e.g. a contactor-fuse combination, a circuit breaker, the protective relay characteristics (thermal, inverse time with or without instantaneous or earth fault elements). 

Some terms are used loosely in various engineering disciplines e.g. plastic, rubber. However, they have particular connotations in electrical engineering, especially in the field of cable manufacturing. 

After his release from the Gulag, Altshuller had three regular jobs. He worked in a cable manufacturing plant, as a journalist, and at the... 

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