Answer / shailender gupta

Ans is right but required
calculation.is
p= root(3) VI COS phi.
find out current i.e I after
putting the value of V , p cosphi
and you will get required
current and multiply with 1.75
acc. to IEC fir safty purpose for
equipment

Answer / sanjeev singh

ACB generally refers to Air Circuit Breaker used for the protection of devices from overloadings or short circuit currents has its range upto 1600A.
MCCB generally refers to Moulded Case Circuit Breaker has its range from 15A to 1600 and generally start at 14kAIC but go up to 100kAIC for applications with high fault current capacity.

So essentially, an ACB is used as almost the last line of defense during a fault. ACB are designed to be field maintainable, unlike MCCBs which are not.

Answer / e.r k.k dash

Suppose there is 750 kva transformer.then acb can choosen by following foamula=kva*1.35=amp
750*1.35=1012.50 amp
So next higher range is chossen.that is 1250 4 pole with high breaking capacity.

HOW WOULD YOU PRESENT THE POWER FACTOR PRACTICALLY ON A GRAPH

4 Answers   Bhel,

---

why we not using 230kv directly why we are stepping down and then stepping up

2 Answers   Siemens,

---

difference b/w semiconductor and dielectric

2 Answers  

---

what is a diffrence between MCCB, RCCB, MCB, & ELCB ? what is rated current e.g. on motor name plate indicated that is rated curent? what is full load current? If we run D.C. motor with mechanical coupling and we measure voltage on terminal it shows voltage or not ? same in AC also possible ?

5 Answers   Reliance,

---

What is the reason behind current flow(20 A) in amain earth cable of an SMDB? Is cuurent flow(45A etc) through a neutral cable acceptable?

0 Answers  

---

In an ideal transformer no load primary current I0 A lags behind V1 by 90 degree B is in the phase with V1 C leads V1 by 90 degree D lags V1 by 45 degree

1 Answers  

---

how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

0 Answers  

---

Is there is any hazard to insulation of 3hp motor 5 KV megger is used for it?

1 Answers  

---

HOW TO CALCULATE AMPs OF CURRENT TRANSFORMER IN HT Panel

0 Answers   MAB,

---

what is reactive power and active power

4 Answers  

---

What is ferrite affects and what is disadvantage of ferrite affects.

1 Answers  

---

design a 3 bit synchronous and asynchronous counter using T- flipflop

0 Answers  

---