Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new

 Categories >> Engineering >> Electrical Engineering

 Civil Engineering Interview Questions (3129) Mechanical Engineering Interview Questions (3300) Electrical Engineering Interview Questions (13439) Electronics Communications Interview Questions (2385) Chemical Engineering Interview Questions (420) Aeronautical Engineering Interview Questions (77) Bio Engineering Interview Questions (17) Metallurgy Interview Questions (80) Industrial Engineering Interview Questions (165) Instrumentation Interview Questions (2401) Automobile Engineering Interview Questions (107) Mechatronics Engineering Interview Questions (38) Marine Engineering Interview Questions (45) Power Plant Engineering Interview Questions (80) Engineering AllOther Interview Questions (1203)
Question
`formula for cable size calculation for current?`
Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By

# 1
Calculations are same as above but for 50A load

We can use the bellow cables

Aluminium: 50 x 3.5 Core

Cu : 16 x 4 Core

 Is This Answer Correct ? 105 Yes 60 No
Govardhana Rao.p

# 2
in case 50amps 230v single phase load we can use 16mm aluminium and 10mm copper
 Is This Answer Correct ? 24 Yes 5 No
Sabu

# 3
the answer is not correct the correct figure is 25mmsq
 Is This Answer Correct ? 35 Yes 19 No
Zafar

# 4
The current will be 27 A for single phase supply(230v)
 Is This Answer Correct ? 2 Yes 0 No
Bipin Naik

# 5
SINGLE PHASE FORMULA FOR CABLE SIZING.

REQUIRED DATA:-
I :- AMPERES
L :- LENGTH OF CABLE.
K :- CONDUCTIVITY OF COPPER(58)
:- CONDUCTIVITY OF ALUMINUM (36)
Vd:- VOLTAGE DROP.

GIVEN DATA:
I:- 50 AMPERES.
L:- 100 METERS.
Vd:- 3% ACCEPTABLE OF 230 VOLTS

FORMULA:-
AREA (mm2)= 2*I*L/(K*Vd)
= 2*50*100/(58*6.9)
= 24.98 mm2
= ALMOST 25 mm2
FOR THREE PHASE:
AREA(mm2) = 1.732*50*100/(58*12)
= 12.44 mm2
= ALMOST 15 mm2
3% voltage drop of 400 volts =12 volts.

ABOVE EXPLAINED FOR IS PROPERLT CORRECT.USE AND ENJOY.

M.SC.ENGG.MIEE(UK)
DATE:- 24/3/2014

 Is This Answer Correct ? 1 Yes 1 No

# 6
2x10 sqmm Cu/XLPE/PVC 600/1000 v
 Is This Answer Correct ? 15 Yes 16 No
Fathi

# 7
230 meter cable
 Is This Answer Correct ? 0 Yes 2 No
Selvakumar

# 8
S=(2.l.i.cosg)/V%
 Is This Answer Correct ? 0 Yes 4 No
Lorp Soophan

# 9
formula is same but for 50 amp load we can use 3.5c
25mmseq.all.and 10mm seq.cu.

 Is This Answer Correct ? 18 Yes 28 No
Vinay Katoch

# 10
by the formula p=v*i*cos@
assume the load as 5kw and operating at 230v and also
assume the load as inductive (so the power factor is 0.5
pf lag)

now by formula
5000=230*i*0.5
i=50A
NOW CABLE SIZE MUST BE > LOAD
SO CABLE SIZE IZ 65SQMM(ITZ DSSEPEND ON AL/CU CABLE)

 Is This Answer Correct ? 116 Yes 136 No

  Question Asked @ Answers Other Electrical Engineering Interview Questions Hi i want to know that in generation station what we are generate either voltage or current 1 What do you mean by linear and bilateral network? Disa 18 why transformer does not obey ohms low? AITM 3 What do you mean by pf of a generator? Power factor purely depends on the load (wether inductive, reactive or unity) then what does the pf mentioned on the generator nameplate means? 3 last week we did the REF relay test by closing single pole (R phase) of CB and apply 380V at the primary of delta transformer. we get 33A at the primary of the R phase star end. but we get 380A at both R an B in delta side. how and why? Siemens 1 Difference between copper earthing & aluminium earthing? 2 What is GNR ? How much value of ground neutral resistance? 9 What is full form of ELECTRICAL? Maruti-Suzuki 2 the circuit having same properties in either direction is known as....... 2 i need to connect fact device(any one from following upsc,sssc,svc,statcom and tcsc)in 14 bus system....by using MATLAB psat software....if i connect these fact devices,i will get some error as "virtual error"...i cnt rectify this error.if anybody know that how to work in psat,pls help me to rectify this error.... or send mail me to, viki0607@yahoo.co.in 1 what is the difference between starter and control panel..? 4 why cannot we use a freuency more than 400hz is used in aircrafts? 1 For more Electrical Engineering Interview Questions Click Here