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General rules of electrical installation design

Tài liệu tham khảo về các kĩ thuật điện | Chapter A General rules of electrical installation design Contents 1 Methodology A2 2 Rules and statutory regulations A4 2.1 Definition of voltage ranges A4 2.2 Regulations A5 2.3 Standards A5 2.4 Quality and safety of an electrical installation A6 2.5 Initial testing of an installation A6 2.6 Periodic check-testing of an installation A7 2.7 Conformity with standards and specifications of equipment used in the installation A7 2.8 Environment A8 3 Installed power loads - Characteristics A10 3.1 Induction motors A10 3.2 Resistive-type heating appliances and incandescent lamps conventional or halogen A12 4 Power loading of an installation A15 4.1 Installed power kW A15 4.2 Installed apparent power kVA A15 4.3 Estimation of actual maximum kVA demand A16 4.4 Example of application of factors ku and ks A17 4.5 Diversity factor A18 4.6 Choice of transformer rating A19 4.7 Choice of power-supply sources A20 Schneider Electric - all rights reserved Schneider Electric - Electrical installation guide 2010 IEG_chap_A-2010.indb 1 04 12 2009 17 1 A - General rules of electrical installation design 1 Methodology A2 For the best results in electrical installation design it is recommended to read all the chapters of this guide in the order in which they are presented. Listing of power demands A - General rules of electrical installation design The study of a proposed electrical installation requires an adequate understanding of all governing rules and regulations. The total power demand can be calculated from the data relative to the location and power of each load together with the knowledge of the operating modes steady state demand starting conditions non simultaneous operation etc. From these data the power required from the supply source and where appropriate the number of sources necessary for an adequate supply to the installation are readily obtained. Local information regarding tariff structures is also required to allow the best choice of connection arrangement to the .