Answer / jafar

for calculating cable size first we have to calculate load current
example 1 : 3KW POWER (1phase)
current i= 3*1000 /(230*0.8)
= 16.3A
for current carrying capacity of 1 sq mm copper is 2.4A
for current carrying capacity of 1 sq mm AL is 1.4A

now here if we use Cu then cable size is 16.3/2.4
= 6.79 is our calculated value
so we can choose near size of cable which is 10 sq mm

example 2 : 100W power (3 phase)
current i= 100*1000/(1.732*400*0.8)
= 180A

like that above
cable size is 180/2.4 = 75
so near size is 95 mm2

Answer / love kumar

for three phase copper cable is consider as 1sq mm ,3amp.
for aluminium cable 1sqmm -1amp

is there any device that works properly accept relay, it may be fuse but if i want fuse of 33kv 300 amp it is avaliable, pls give me details

0 Answers  

---

Consider three heater bank connected in 3 phase star with neutral.Each heater bank connected in each phase.So each phase get 230 volts supply.my question is,during balance condition, current flow in neutral or Not

0 Answers  

---

which transfofrmer oil break down voltage strength get will be more if oil sample taken from bottom of tank or oil sample taken from top of the transfomer tank.

2 Answers   NPCIL,

---

wath is skin effect?

9 Answers  

---

If one lamp connect between two phases it will glow or not?

9 Answers  

---

---

Please tell me if you are electrical engineer,and you are appointed for the maintainance of Electrical Power plant,then which parts of the plant deal with you.Also tell how these parts/components work.

1 Answers  

---

What's the part of OTCC in transformer?

7 Answers   Bhel, RRB,

---

In single core cable, Why non-magnetic material is used??

1 Answers  

---

need of capacitor used in plant

3 Answers  

---

Starting times for soft starter & power factor is thier any standard or datas available in manufactures list. Kindly suggest.

0 Answers  

---

What is the basic difference between AVR and stabilizer?

2 Answers   Gujarat Alkalies and Chemicals GACL,

---

1.Why we use choke?If we use for high starting voltage then different type choke gives different voltage. Is it correct?

2 Answers   Dalkia, Luminous,

---