Answer / goutam ghosh

Busbar size for a rated current can be calculated from
CURRENT DENSITY. Current density for copper is 160
amps/sqcm.(1000 Amp/sqinch.)and for Aluminium the same is
130 Amp/sqcm.(800Amp/sqinch.).Say for 200 amps reated
current Aluminium busbar of cross section 30mm X 5mm or
Copper busbar having cross section 25mm X 5mm should be
used according to nearest availability at market.

How do apply electrical 'c'license......pls advice

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why the voltage level in transmission line are in multiple of 11kV, 22kV, 33 kV etc..( i.e., 220 V )?

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How much allowable difference current between on three phases Dear sir, We have a 1870 KW HT motor, 11 Kv supply,FLA-120A,2870 rpm,2-pole squirrel cage induction Motor.And stator is connected in star connection with Liquid resistance stater to limit the starting current.It has coupled with Centrifugal air compressor.My question is it is loading 73% of FLA taking R-phase 86.7 A, Y-phase-85.4A,B-phase- 78.3A.why the B phase current is that much of difference.Is it allowable, or any one tell me how much allowable current.If any method to calculate.

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