Answer / govardhana rao.p

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

Answer / sabu

in case 50amps 230v single phase load we can use 16mm aluminium and 10mm copper

Answer / zafar

the answer is not correct the correct figure is 25mmsq

Answer / bipin naik

The current will be 27 A for single phase supply(230v)

Answer / fathi

2x10 sqmm Cu/XLPE/PVC 600/1000 v

Answer / engr.muhammad younas khan

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.

ENGR.MUHAMMAD YOUNAS KHAN
M.SC.ENGG.MIEE(UK)
WAZIRABAD CITY,PUNJAB, PAKISTAN
DATE:- 24/3/2014

Answer / selvakumar

230 meter cable

Answer / lorp soophan

S=(2.l.i.cosg)/V%

Answer / vinay katoch

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

Answer / gurunadharaov

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)

apti mainly on logical reasoning, verbal and non-verbal ability (70 percent) and remaining technical. I was in ee but technical had mech ques like on turbines and welding.

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