Answer Posted / abdool

3pahse power is P(in KiloWatt)=I.V.PF.(root 3).....
I=1.74 x P(KW)
EXAMPLE:
so, assume 3ph 400V 15KW motor, In=1.74x15=26.1 A,
& 15KW=20HP.....so 2xIn=Breaker rating= 52.2A
...choose 63A MCB

Cable size normally 20-25% higher than breaker to avoid
cable heat/burn accident in overcurrent fault. so, 1.25xIn=
62.64A so choose 80A Cable rating of 25mm2.

hi I have done 3 yrs diploma in electrical engg after 10+2. I have 16 years of work experience into design proposals sales and engg application development in LV/MV swithcgear and sub station automation field. I want to apply for immigration to new zealand but I am not sure whether I qualify or not since I dont have a degree. Can anyone advice? Thanks Riz

2291

---

what is apparent poewr, reactive power, & active power?

2360

---

what is the profesional board for electrical engineer what is thepast and during construction for electrical engineering

2083

---

May I know how much values to be set for earth fault, over current and short circuit values at 11kv side? I have 11kv van 1250amps rating. Present it's taking load 80amps?

1504

---

Lt motor sfu flashing reasons?

1800

---

errection check list for transformer maintenance

2611

---

What is the most important precaution in any experiment with d.c. Shunt motor?

1272

---

Please brief what is sinewave

2162

---

How to measure the Harmonic Distortion of UPS ie THD?

2362

---

what is the pre charge circuit,what will be work which function it will be use plz tell me

1941

---

Define load factor?

1134

---

how a flip flop can be used as a latch?

2006

---

what is earthing.how we make it,describe briefly.

2631

---

1600kva capacity Transformers how the bucholz relay,Oil temperature,winding,surge relay relays setting are to be done

1913

---

what is draiv work

1914

---