What is cable size for 3 110kw 3 phase induction motor 100 meter run for cable 400v?

Answer 1

first calculate the full load amps of the motor by using formula,

line amps = KW * 1000 / (line volts*1.732*P.F)

Of the mentioned motor the amps will be 96 amps at the P.F 0.8. The motor will have star delta starter so the cable size would be 2 runs of 3c x 70 sq mm AL if laid in air.

Answer 2

For an Induction motor, it is recommended that the cable size should be able to bear high motor starting current. For a 75KW, the motor should be run with a special control method: an auto transformer method or Star/Delta method so as to reduce the earlier mentioned high starting current.

Working with a star/delta control method, the motor starts in Star and Runs in Delta.

Star arrangement delivers about 58% of the motor voltage and allows line current to pass into the coils of the motor so that you will require 2x50mm square copper cables per phase to power a 75KW induction motor.

Answer 3

It depends on the type of conductor, the configuration of the cores, the type of insulation, the method of installation, and whether or not the cable is armoured! Work out the load current, remembering the 0.75 kW is the output power, not the input power, power! And then check out the Tables in BS 7671:2008Requirements for Electrical Installations.

Answer 4

electric cable for 112KW MOTOR 3 phase 385volts 50 hz at 2900 rpm

Answer 5

this motor almost draws 198 amps at 0.8 pf

so 150sqmm Al cable or 135 sqmm Copper cable are recommended

Answer 6

The current can be estimated at 120 amps, for which the cable size for a short run like 10m is 35 mm-sqd.

Answer 7

A 1/0 MCM copper conductor will limit the voltage drop to 1% or less when supplying 129 amps for 33 feet on a 415 volt system.

Answer 8

4 x 25 mm2 cable