How to calculate cable sizes in sq.mm. with using motor KW?
Any formula there?
Answer Posted / sagir siddiqui
First of all you need to verified full load current of motor,
How can you calculate:
Ex: 1 Motor - 20HP 3ph. 415V 50Hz, 80% efficiency
Cal: A= HPx746/(sqrt3xVoltxPFxefficiency)
=20x746/1.732x415x0.8x0.8
=32.43Amp.
We all know that a motor has 1.5 times starting current,
Then 32.43x1.5 = 48.65Amp
Now you can see in the current currying capacity of cable from manufacturer cable's list.
3.5 x 35 sqmm xlpe cable is sufficient for full load.
Is This Answer Correct ? | 347 Yes | 171 No |
Post New Answer View All Answers
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING) I O (current operating)?
i had aplied Hindustan Petroleum corporation limited for the post of maintenance technician -Electrical,i want model questions,if anybody have please send it or please advice?
What is the use of mc( moving coil) in dc voltmeter and dc ammter and what is the use of ( moving iron)in ac voltmeter nd ac ammeter
Good day everyone,currently in our premise we using 30kw slip ring motor with resistance bank which we use as forward and reverse at conveyor bar handling. So,my question is how do we calculate the resistance bank which is suit the motor. Kindly,assist me... thank you
how to select rating of HT Panel
WTA used cb?
application s to shunt coil
could you measure current in parallel?
What is the reason of polyphase induction motor tripping suddenly on high current during running at 70% laod? Motor IR , winding resistance & inductance balance. Motor no load current is balance and ok as per mgfr. data.
what is upper impedance and lower impedance of a distance relay
In EDO ACBs what is a purpose of closing coil and motor, what is the operation of these devices are they inetconnected. means if we give supply to motor and by BCS we charge Closing coil,what exact is operation is and how it charge a spring of ACB. Sir if anybody has an wiring diagram please send me the link to operate and EDO breaker.
Both generator parallel condition shared load equally but one genrator taking ampere more than the other what are all the causes to make like this
while doing high voltage test on 11kv/433 distribution transformer why we only give 28 kv on hv side and 3kv on lv side for power transformers what is the value what factors it depends
what is your majour contributions in your present job
define the active power?