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 Go to Content ↑ Current Capacity of Equipment 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) Go to Content ↑ Earthing Resistance Earthing Resistance for Single Pit = 5Ω, Earthing Grid = 0.5Ω As per NEC 1985 Earthing Resistance should be < 5Ω. Voltage between Neutral and Earth
Posted on: Tue, 10 Sep 2013 18:40:53 +0000
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