How can calculate HT side VCB? For example I have 1250 KVA
load what will be HT side VCB Amp.range and what size XLPE
cable I use for HT side.

Answer Posted / owais

dear first u do calculate you load in watt and then u do
find amp with the help of voltage in the end u have total
amp and your breaker 20% extra

Is This Answer Correct ?    13 Yes 6 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

1411


How to know of any cable size if there are not written on cabl?

1440


is that any software calculator to calculate the size of cable

1864


please send me RRB electrical engineer previous year questions for Sr. Section Engineer

1485


Differentiate between kirchhoff’s first law and kirchhoff’s second law?

611






how many Classification of fire extinguisher

1668


The Q-facr o of a coil given as wL/R. what will be shape of Q versus frequency graph.

1550


if 12v battery get discharged for 2 months after if we put charge it will charge again?how much time it will take to charge?

1525


Draw the equivalent circuit of crystal oscillator?

759


How to calculate the fuse rating depend upon the DC circuit?

2386


what is formula for calculate thermal overload in new numiricalrelay( not in bimetal relay)?

1786


A generating system will have a total capacity of 300 MW. Find the probable forced outage when the capacity is supplied by two 150 MW units. The operating probability of all units is P=0.98 and forced outage probability rate Q =0.02 .

2139


A mass of 1200g is accelerated at 200 cm/s2by a force. The value of the force required is:(a) 2.4N(b) 2400N(c) 240 kN(d) 0.24N

2124


we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.

1488


Why is the starting current high in dc motor?

611