Answer / abid

Normally for the circuit breaker calculation we multiply our motor's current into 125% for example if a motor 5HP operates in 8amps we multiply8*125%(10) so the breaker size will be 8+10 18amps or 20 amps.
and for the cable size we multiply breakers amp*1.5
=27
so for 5hp 3ph motor suitable breaker is 20amps
and the suitable cable 4sqmm

Answer / naresh

1sqmm will withstand upto 4amps.

(i.e) 1sqmm = 4amps

Answer / sibu

One has to consider the distance of the motor and power supply sources too. In short if the motor distance is let say 400 meters from the power supply then voltage drop will be more and in that case u need to consider bigger size cable then what u find in calculation

Answer / k.l.lim

ex 10kw 3 phase ac motor,
10kw x 1.74 = 17.4 amp
MCB using 25 amp/30 amp 3 pole(C)
Motor using star-delta/overload setting 0.58 = 10.1 amp
cable size = 6x2.5mm2/1c pvc copper cable

if using soft starter
MCB using 25amp/30amp 3 pole MCB(C)
cable size = 3x4mm2/1c pvc copper cable

cable size :calculate include starter overload setting
(right or wrong,thank's)L

Answer / pedro

what's wrong with you guys. You dont even know how to spell
correctly. Please improve on that. Its not only about idea
but also on how you convey it. Damn!

Answer / raja

THE ABOVE SAID IS WRONG , ITS A THUMB RULE I USE TO FALLOW
1 sqmm = 5A & endangering amps withstand is 8A for alu
(sqmm * 1.87A)for cu sqmm *2

Answer / ibrahim

for cooper 2.5 mm for 1 amp
for aluminum 1.5 mm for 1 amp

Answer / hemant

Normally copper has more conductivity than aluminium. So it
is actually reverse. 1.5 mmsqr for copper and 2.5 mm sqr
for alu

Air refrigeration cycle works on the

0 Answers   Caterpillar,

what are the main parts of UPS what is the function of that?

23 Answers   Apollo, HCL, Liebert, Royal Furnishers, Tech Mahindra,

why surge suppressor in vaccum circuit breaker and it is only in motor feeder why not in tranformer feeder?no surge suppresor in ocb in motor feeder?

1 Answers   IOCL,

What will happened if the neutral of the (star connected secondry) Xformer disconnected? (if its Above KVA rated one)

0 Answers   Equate,

what is the difference between earthed cables and unearthed cables

2 Answers   Bhel,

why ht motor connection in star

10 Answers   Suzlon,

Resistor switching is used in which type Circuit Breaker ? a) oil filled CB b) Air blast CB c) Gas filled CB

11 Answers   Engineers India Limited, wbsedcl,

Is 3 phase induction motor can work as a generator?? if so why & how??

2 Answers   Jindal,

what is relation between HP & BHP

3 Answers   Usha Martin,

what is meant by the phrase 'static load' in case of shorting in a generator excitation system?

0 Answers  

what is the function of capacitor duty contactor in an capacitor panel???

0 Answers  

What is mean by spike arrester(Voltage Operated)

0 Answers   Siemens,