Appendix 9C: Design Calculations for Electrical Design

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Chapter 9 Electrical Design SPU Design Standards and Guidelines November 2020 i Appendix 9C Design Calculations for Electrical Design Chapter 9 Electrical Design Appendix 9C Design Calculations for Electrical Design ii SPU Design Standards and Guidelines November 2020 Contents 1. Introduction ........................................ ........................................ ................. 1 2. Software ........................................ ........................................ ....................... 1 3. Calculation Matrix ........................................ ........................................ ...... 2 4. Basic Requirements for Electrical Calculations ....................................... 4 5. Basic Electrical Engineering Formulas ........................................ ............. 4 List of Symbols.

Real Power W = V x I x pf Phase Angle θ = arctan(W/VARS) Power Factor pf = W/(V x I) = W/VA Voltage Drop V ( ) d =2× I ×R×cosθ+I ×X ×sinθ where : Vd = voltage drop in circuit sinθ = load reactive factor X = reactance 5.4 ALTERNATING CURRENT (AC), THREE-PHASE V denotes line to line voltage. Basic Formulas Apparent Power kVA =(V I× 3)

  Phases, Power, Three