Electrical wire and cable

Jptt Kokai Tokkyo Koho 79 00,094 (1979), E. Kosokawa and co-workers (to Showa Electric Wire and Cable Co., Ltd). 

Advantages of the electron beam processor are its abiUty to penetrate thick and highly pigmented coatings. It is used to cross-link reactive unsaturated polymers, nonreactive thermoplastic polymers, iasulation, and wire-cable covetings (4,9,16) (see Insulation, electric-wire and cable COVERDIGS). 

Japan Electric Wire and Cable Maker s Association reduction by 25%... 

In office buildings it is very common to have plenums, i.e. spaces above rooms where the air handling system is located, together with electrical wires and cables, as well as abundant wood and other construction materials. These concealed spaces are usually ca. 1 m (3 ft) high and are invisible from the room below. 

Method of Test for Fire and Smoke Characteristics of Electrical Wire and Cables, 1990. Standard Method of Test for Heat and Visible Smoke Release Rates for Materials and Products, 1990. 

Electrical wire and cable insulation and jacketing, wire wraps, motor lead wires, compact wire and cables, airframe wiring, extruded coatings... 

Electronics and electrical (wires and cables, shrinkable tubing, displays, conformal coatings, adhesives, and battery separators)... 

Examples of fluoroplastics include polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), ethylene—chlorotrifluoroethylene (ECTFE), ethylene—tetrafluoroethylene (ETFE), poly(vinylidene fluoride) (PVDF), etc (see Fluorine compounds, organic). These polymers have outstanding electrical properties, such as low power loss and dielectric constant, coupled with very good flame resistance and low smoke emission during fire. Therefore, in spite of their relatively high price, they are used extensively in telecommunication wires, especially for production of plenum cables. Plenum areas provide a convenient, economical way to run electrical wires and cables and to interconnect them throughout nonresidential buildings (14). Development of special flame-retardant low smoke compounds, some based on PVC, have provided lower cost competition to the fluoroplastics for indoors application such as plenum cable, Riser Cables, etc. 

Because copper is a very good conductor of electricity, it is used for electrical wiring and cables (Figure 5.16). Pure copper is also used in the manufacture of cooking utensils owing to its high thermal conductivity, a property of its metallic structure (Chapter 3, p. 55). 

It is important to point out that the abovementioned regulations do not include any requirements in the United States for construction products (building products) or electrical wires and cables (or their optical fiber equivalents), other than in some transportation vehicles. As explained earlier, these requirements are contained in codes, which may be adopted into regulation. Most other developed countries have government-mandated regulation for such products. 

CSA FT4, Vertical Cable Tray Test in CSA 22.2, Test Methods for Electrical Wires and Cables (C22.2 No. 0.3), Canadian Standards Association, Rexdale, Ont., Canada. 

The crosslinking efficiency of benzophenone could be due to the formation of a more active radical site and/or to a more efficient sensitization of hydroperoxide decomposition. The insulating electrical wire and cable made of EPR were irradiated with 200 Mrad y-ray [78] for vulcanisation purposes. The changes in... 

Flame retarding plasticizer used in cellulose, polyester and polyurethane. Mainly used in the manufacture of electrical (wire and cable) and automotive plastic parts. May also be used for die preparation of vinyl sheets, fabric coating, plastisols and organosols, adhesives, vinyl packing materials, and conveyor belts. 

A number of manufactured products comprising thermoplastics (polyethylene, polyvinylchloride, polyamides,. ..) or elastomers (natural rubber, nitrile rubber, ethylene propylene rubber, silicones) are processed by cross-linking to improve their performances in insulated electric wires and cables, multilayered films for cooking pouches, shape memory tubes, pressure resistant water pipes, expandable foams, automotive parts exposed to motor... 

Hydrolysis is an important environmental fate process. Hydrolysis rate is characterized by a half-life of 17.5 and 11.9 days at pH 7 and 9, respectively. TOTM is not readily biodegradable. Bioconcentration factors are measured up to 2.7 which is considered low if released into surface water. TOTM is expected to absorb to suspended solids and the sediment. Because of the major use in electric wire and cable TOTM is fixed in the matrix and no substantial exposure is expected. 

Electric wires and cables used in nuclear power plant are exposed by low dose rate irradiation during the life time of the plant. In addition, loss of coolant accident (LOCA) that is a design basis accident brings about the degradation by heat and radiation on the electric wire and cables. The dose varies from plant to plant. IEEE std.323-1974 (/) estimated the dose 0.5 MGy for the period of the life time and 1.5 MGy for LOCA as one of the example. The standard estimated 40years and one year, for the lifetime of plant and duration of LOCA respectively. 

The time accelerated aging method for electric wires and cables requires a high dose rate irradiation, but the exposure to polymer in air results only the oxidation of surface when the dose rate is higher. I previously reported the methodology study of time accelerated irradiation of elastomer (2). The study showed two appropriate methods, one was irradiation in pressurized oxygen at room temperature the other was irradiation at 70°C in air. The article studied the effect of higher dose (up to 10 MGy) irradiation on ethylene-propylene-diene elastomer (EPDM) by using the time accelerated method. Irradiation at 70°C in air was chosen as the time accelerated irradiation condition because of the experimental convenience. 

USE Rubbar substitutes, electric wire and cable-coverings, pliable thin sheeting, film finishes for textiles, non-flammable upholstery, raincoats, tubing, belting, gaskets, shoe soles. 

Worldwide, the largest use of copper (-9.75x10 tons) is in electrical wire and cable and other electronic applications (MARCO, 1989). Metal copper is also used in water piping, stills, roofing material, and kitchenware for chemicals and pharmaceutical equipment as a pigment and as a precipitant of selenium (Fabian 1986). Copper metal has contraceptive properties, and an intrauterine copper device (lUD) was developed for humans (Zipper et al. 1968) a typical lUD may add 80 p,Cu per day to the woman s body (Kjaer et al. 1993). 

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