What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

0 Answers  

---

60 watt bulb and 1500watt iron which device has more resistance & why

5 Answers   RMSI,

---

Why servomotor and induction motor are in different shape

1 Answers  

---

what is the difference between ac drives and dc drives?

1 Answers  

---

What is Bolted fault?

0 Answers  

---

what are the components of a start and stop motor control?

2 Answers  

---

what is interlocing and what is the purpose of this?

4 Answers   L&T,

---

why the field winding in dc motor is not short circuited eventhough dc supply is applied across the winding

0 Answers   Torrent Pharma,

---

which is the slowest motor? and wt is speed ?

1 Answers  

---

Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

---

What are n circles?

0 Answers  

---

What will happen if we give 220v supply on both sides to the bulb

7 Answers   Exide, Sumeet Industries, Toshiba,

---