Answer / appar

above mentioned is ok. we should take distance also in an
account bcoz if there is a long length cable voltage drop
is also increase for that we increase the sqmm of the
cable..

Answer / sreenu

Based on KW/HP value the current rating can be caluculated
and based on current rating of Mains & cable size can be
caluculated.

for example.
HP of the motor is :A HP
KW of load is :A HP/735.5*Efficiency(E).
Generally eddicieny of the motor can be asuumed 0.8 to 0.9
Current(C) is :A HP/735.5*E*(1.73*V* cosQ)
Cos Q generally asumed as 0.8 to 0.9

If the value of current is C, the current capacity of cable
reuired is Appx. 1.5*C.

Based on cable catalogue provided by the cable manufacturer
the size of the cable can be selected.

For eample. If you use al. cable, the size of cable is
bigger than copper cable.

Rating of mains: 1.5* C, but fuse arting is C only.

if a bird sits on the service wire it didn't get shock then why the human get shock when he touches it(assume that human is not on the ground and any object i.e. in space)?

5 Answers  

---

can alternators work at leading power factor?

2 Answers  

---

I am mechanical engineer,I need Training in Electrical & Electronics ( i.e. three days workshop training ) Where will I get the same Please suggest?

2 Answers  

---

what is volt drop formula?stm

1 Answers  

---

What is the current carring capacity of 0000SWG and 0SWG overhead solid bare copper conductor. If possible please provide reference for various sizes Vs current ratings

1 Answers  

---

transformer losses

1 Answers  

---

What is the difference between Isolator & Load Break Switch?

7 Answers   Infotech,

---

diameter of cable and core is doubled then the value of capacitance is

0 Answers  

---

how much percentage set in transformer diffrencial relay

1 Answers   Bajaj,

---

what is the function of 1 phase preventer?

3 Answers   ABB, Electrical,

---

is it possible to minimize the copper loss?

2 Answers   Coal India, TATA,

---

In any plant or substation main incommer voltage RY - 415 V,YB - 400 V, BR - 387 V(in commer feed from transformer 11 Kv /0.415 KV) why found voltage differance in each phase? plant have not self power plant it is depend on outsource grid

2 Answers  

---