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Electrical Thumb rules

Special Thanks to http://electrical-engineering-portal.com/ Electrical Thumb Rules-(Part 1). Cable Capacity: For Cu Wire Current Capacity (Up to 30 Sq.mm) = 6X Size of Wire in Sq.mm Ex. For 2.5 Sq.mm=6×2.5=15 Amp, For 1 Sq.mm=6×1=6 Amp, For 1.5 Sq.mm=6×1.5=9 Amp For Cable Current Capacity = 4X Size of Cable in Sq.mm ,Ex. For 2.5 Sq.mm=4×2.5=9 Amp. Nomenclature for cable Rating = Uo/U where Uo=Phase-Ground Voltage, U=Phase-Phase Voltage, Um=Highest Permissible Voltage Current Capacity of Equipments: 1 Phase Motor draws Current=7Amp per HP. 3 Phase Motor draws Current=1.25Amp per HP. Full Load Current of 3 Phase Motor=HPx1.5 Full Load Current of 1 Phase Motor=HPx6 No Load Current of 3 Phase Motor =30% of FLC KW Rating of Motor=HPx0.75 Full Load Current of equipment =1.39xKVA (for 3 Phase 415Volt) Full Load Current of equipment =1.74xKw (for 3 Phase 415Volt) Earthing Resistance: Earthing Resistance for Single Pit=5Ω ,Earthing Grid=0.5Ω As per ...
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Electrical

ELECTRICAL ENGINEERING ELECTRICAL ENGINEERING Electrical engineering   is a field of   engineering   that generally deals with the study and application of   electricity ,   electronics   and   electromagnetism . The field first became an identifiable occupation in the late nineteenth century after commercialization of the electric   telegraph   and electrical power supply. It now covers a range of subtopics including   power ,   electronics ,   control systems ,   signal processing   and   telecommunications . Electrical engineering may include   electronic engineering . Where a distinction is made, usually outside of the United States, electrical engineering is considered to deal with the problems associated with large-scale electrical systems such as   power transmission   and   motor control , whereas electronic engineering deals with the study of small-scale elect...