Answer / k.prakashchandra

EFR is usually set at 20 % of OCR.The earth fault current
is V/ Z of the line + ER value of the support.But you can
not expect this calculated earth fault current.

iam interesting to design the control panel for 3 phase pump motors by controling single phase switches.iam plan to use fuse,contactor & relay for motor protection .how can i select the voltage & amps rating for fuse,contactor & relay plz guide me .if anybody clarify my doubt means it will more helpful for my future .

1 Answers  

---

How to select a cable size according to load

1 Answers   Red Bull,

---

IF i have switchgear with busbar current rating of 1000Amp 35kA then is it necessary to have outgoing breaker kA rating to be equal to busbar kA rating?

6 Answers   L&T,

---

what must be the mf for a meter with the following conditions. line ct ratio-100/1 line pt ratio- 220kv/110v meter pt ratio- 3X63.5V meter CT ratio- -/1 A

1 Answers  

---

why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?

0 Answers  

---

11kv alternator commissioning test?

2 Answers  

---

I have draw the 350A DC current, so what is the size of cable i can use? Give me the answer with formula

1 Answers  

---

want happens when a dc is given to a commutator

2 Answers  

---

What is transient Phenomenon?

0 Answers  

---

There are a Transformer and an induction machine. Those two have the same supply. For which device the load current will be maximum? And why?

4 Answers  

---

Can we use HRC Fuse inplace of Semiconductor fuse?

1 Answers  

---

Can someone explain how does an IDMT relay works.

1 Answers   AFM,

---