Home modification electrical

In homes, fuel cells may one day replace the batteries currently used to provide electrical power for cell phones, DVD players, and laptop computers. Fuel cell design is still in the prototype phase, although there is much interest in their development. We already know they can work, but modifications must still be made before they become reasonably priced and part of our everyday lives. 

At home, our motors are single phase. At the plant, the motors are usually three phase. There is an important difference between a single- and a three-phase motor. The three-phase motor can also be used as an electric power generator. The single-phase motor we use at home, without modification, cannot be used to generate electric power. The difference is important in that I once used this fact to avoid tripping off a critical process pump, as related in the following story. 

Poly(ether-ester) (PEE) copolymers obtained by modification of poly(ethyl-ene terephthalate) with up to 20 wt% of poly(ethylene ether) glycol was first described by Coleman [8]. Subsequently, the DuPont Co. developed poly(ether-ester) elastomers, which were commercially introduced in 1972 under the trade name Hytrel [4,9]. The polyester thermoplastic elastomers are nowadays produced by several companies. Apart from DuPont, these are DSM, The Netherlands (Arnitel ), General Electric, USA (homed ), Hoechst Celanese, USA (Retiflex ), Toyobo, Japan (Pelprene ), Elana, Poland (Elitel ) [2,10]. The synthesis, chemical structure, physical properties, and some new applications of polyester TPE are discussed in this chapter (about the development of TPE, see also Chapter 1, while details on some commercial TPE products can be found in Chapter 17). 

As an example of the lack of understanding, a potentially serious incident occurred recently that helps to drive this message home. A 90,000-square-foot warehouse had just opened and some electrical modifications were needed. The warehouse manager called the electrical repair company to conq>lete the project. 

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