I want formula to calculate cable size as per load given in
kw & amp.I searched many sites but didn't right answer.Plz
reply me asap.
- 41 Answers
- 411180 Views
- Armco, BEL, BGS, Biocon, BRB Cable, Crystalline Chemical Industries, DLF, Doshion, Electrical, Gold Roof, L&T, Lanco, MEIL, Oman Cables Industry SAOG, PK Services, Polycab, Sabic, SLV, System Electrical, Tata Motors, UEM, UMIC, Vega, Vertex, Voltas, I also Faced
- E-Mail Answers
Answer Posted / tushar jana
I dont understand why people are complicating the issue....
the answer is very simple.
Consider Cable selection for the 3ph motor of 1kW
Formula>> P= root(3) x V x I x Cos(Phi) x Eff
p= power... Say 1kW
V= voltage (415Volt)
I= Unknown
Cos(phi)= 0.85.. say
Eff= Efficiency..= 0.85... say
Now,calculating this, we get>> I= 1.9Amp.. say approx 2A
Now derate this current (bcoz, cable will be laid in duct
or undergroung,etc) consider derating factor as 0.7 (say)
Then current is 2A/0.7=2.85A... say 3A..
now see the cable catlogue of any company.. say polycab..
See which size of cable can carry 3A current and use it...
thats it..
Approx.. for 1kW motor, 3Cx 2.5 Sq.mm cable is sufficient
upto 275m length.
NOTE: This is rough method of calculation. If cable length
is more or motor size is more... then voltage drop
calculation is also to be done.
Contact- 9665065050
| Is This Answer Correct ? | 19 Yes | 4 No |
Post New Answer View All Answers
how to calculate the conductor size for certain KV transmission line and distribution line?
i have been tasked with a design of protection, metering and control(PMC) relay panel extension to accommodate all PMC relays.There is an already existing panel where this one will be built.What are the design aspects for this kind of project? thank you.
how many types are their in switchyard or substation(like D,I TYPE), what is differant between them
sir iam a 3rd yr eee student.no core company comes for recruitment to our college.my aim is to be placed in l and t.tell me the procedures.
whatis the commertial spec. of distribution boards ?
Please explain, how to test vector group of tranformer(Delta y1) . Thank
i want bhel placement paper for electrical if anybody having pl send to my id kavitha867@myway.com immediately
i am electrical and elctronics engg passed out in 2009 want to attend for reliance placements.plz send me apttitude ,technical and hr question answers to my mail plz. my mail id-kat.bindas@gmail.com
What are the causes of unbalanced current on 34.5kv feeder Ia=0.05,Ib= 0.25, Ic=0.15 and In=0.27 prior to tripping current are balance?
Why generation voltage in thermal power plant is between 11kv to 33kv?
number of I/O devices in siemense plc
Please define ohm’s law for a.c (alternating current)?
when we decide to use soft starter drive or vfd drive in mcc to operate apump?
Is neutral transformer can be called as control transformer?
transformer spections :: input voltage 0-110-230v; output volage 0-10-12-14v; amp=3A using CRNO CORE, capcaity=50VA primary turns = ? ; secondry turns =?
