Answer / engr ali mehmood

MCB are used for small power application; usually used in
the household appliances current rating is 5A.
MCCB are used in high power application in generation
station above 100A;Rarely used but the most common used in
industries is MPCB variable Rating of current adjust
according to the load current of the the appliances. and
the ELCB is a earth leakige circuit breaker it is use for a
body earth ground earth

Answer / simon peter

Here 18.5w means 480v*38 amp so buy any one of these impere based ......

Answer / jayaraj

P=Sq rt 3VI pf
So I = 27.8 Amps. considering the staring current twice as full load current = 55A so 63 A MCCB required. Depends on the KA of the system 25KA or 50 KA MCCB can be selected.

Answer / s.k.sharma

MCB are used for small power application; usually used in the household appliances current rating is 5A.
MCCB are used in high power application in generation station above 100A;Rarely used but the most common used in industries is MPCB variable Rating of current adjust according to the load current of the the appliances. don't know about the ELCB just cheak out on Wikipedia...

How does the humidity affect in breakdown voltage of air?. Is the breakdown voltage increases with the humidity?

2 Answers  

---

hai...... tis is Hemanth. jst now completed electrical engineering... i wanna to apper for ap tranco exam... plzz send me the previous q's paper link......thanx in advance.

0 Answers  

---

can we charge 3 ph power transformer delta-star wound with neutral grounded 6.6kV/415V from secondary side(415V) but with primary(6.6kV) open by dg,what are the disadvantages or losses.

1 Answers  

---

Which thing is maximum in RLC circuit at resonance a)power consumption b)inductive current c)capacitive voltage

0 Answers  

---

how calculate kva in to kw

1 Answers  

---

Can step down transformer works as step up one???

2 Answers  

---

If not into production, how far did you follow the design and why did not you see it into production?

0 Answers   Bharti, Havells, Intel,

---

for 750 kw LT load what will be the ht kva

0 Answers   Sterling Tools,

---

what is the excess air in furnace

0 Answers  

---

why not starting switch first connect in direct on line starter?????

0 Answers  

---

Why lose 1 phase voltage in 33kv to 415v stepdown transformer

0 Answers  

---

what is the resistence of human body?

3 Answers   BBC, NTPC,

---