Answer / rajith

sudden rise of current

While connecting the flood light plug on to the 415 V distribution panel,there was spark and the cable got burnt. Three ignitors of the flood light also burnt of. The lamps are of 400 W (total 6 lamps) connected through 1.5 mm2 cable. The plug was immediately removed from the circuit. There was a 30 mA RCD connected and a 250 A MCCB; however both did not trip. What could be the possible reasons for the circuit devices not to trip?Can someone assist please. Additional info if needed can be provided.

2 Answers  

---

If the line voltage is reduced to 75% of its rated value then by what percentage current will reduce ?? 75% 25% 50% no change and why ?

0 Answers  

---

why would the rotor rotate at sub synchronous speed against the direction of rotating flux when d rotor of 3 phase IM is connected to 3 phase balanced supply and the stator windings are shortcircuited ??

0 Answers  

---

why the rating of dc generator is in kw where as rating of alternator is in kva?

3 Answers  

---

What is meant by operating sequence of VCB : 0–0.3sec.–CO– 3min.-CO

2 Answers  

---

is it possible to turn on the single phase star delta on delay timer using 24 v dc ?

0 Answers   L&T,

---

what will be happened when a single phase motor is supplied by the dc supply

3 Answers  

---

How much UG cable size should i use so as to accomodate a ground + 2floors house. A 1.5ton AC & geysers(2) in each floor with lightings

2 Answers  

---

WHAT IS SHORT CIRCUIT STRENGTH OF 100 AMPS MCCB?

0 Answers   ACC,

---

What is the technical reason for adopting color coding of three phase system as RYB.

11 Answers   ABB, ERDA,

---

examples of resistive inductive and capacitive load

1 Answers  

---

What is basic impulse insulation level? And how it is calculated for sub- station?

2 Answers  

---