I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers  

---

Why the high starting current does not harm the low capacity induction motor?

1 Answers  

---

what is the use of the circle diagram

2 Answers  

---

6. A DC AMMETER HAS R=0.1 OHM & CURRENT RANGE IS 0-100 A IF THE RANGE IS TO BE EXTENDED TO 0-500 A THEN METER REQUIRES SHUNT RESISTANCE OF ..........

2 Answers   SSC,

---

why ups rating in kva? and why ups are in parellel?.why isolation transformer is used in ups?

0 Answers  

---

---

1.What is the maximum transmission voltage in india & where it is located? 2.more information about indian power scenario.

4 Answers  

---

Discribe type of fault in DOL and stardelta startor.

0 Answers  

---

What is differance between alternator and generator?

4 Answers   IOCL,

---

what is the differents and advantages of Electro magnetics relay and static relay ? what is the numerical relay ? advatages?......

7 Answers   CAT, L&T, TCS,

---

How phase to phase voltage comes 440V.

0 Answers  

---

In three phase energymeter the spindle rotating backward why?

1 Answers  

---

How to detect voltage vector shifting in interconnection protection.

0 Answers  

---