Fot testing new star-delta 132 kw motor in electrical worshop.we should check in star or delta connection as we do not have higher capacity cable in worshop?

4 Answers   Adani,

---

What is the difference between shortcircuit current, rated current of cable & MCB with example? What will be the size of cable required for 5.5 KW motor (Full load current 10 Amps approx.), Starting current with DOL is 120 Amps. Aprrox. Short circuit current with LLLG fault is 2000 Amps Approx.

0 Answers  

---

What is the basic difference among Circuit breaker,Contractor and Isolator? Are they different names of same device/equipment?

2 Answers  

---

what is the formula for building wiring to get the main breaker.

1 Answers  

---

I am final year b.tech student..i applied for gate but i am not interested any of my engineering subjects. i am interested in management wise.. is my option correct after b.tech..

1 Answers  

---

why it is necessary to short and ground of a current transformer secondary side?

6 Answers   Ambuja,

---

choose the non-switch device (A) transformer (B) diode (C) transistor (D) IC

3 Answers  

---

Does VT metering core can be used for synchronizing.

1 Answers   Shrishti Power Technologies,

---

How to find Cable size? Caterpillar generator produce (Two generators) 127*2=254 amp at 11 kv . What would be the cable size (XLPE) to supply 256 amp at 11 kv? Air or surrounding Temperature is 32 degree C. Cable will go under ground at 2.5 feet depth. Group Rating Factors is 3 cables. Clearance between cables is 7 cm. Soil Temperature (Ambient) 28o C Soil Thermal Resistivity is 1.2 K.m/W I would like to use 3 separate single core instead of using 3 core cable. Some says I should use three separate single core 120RM cables. Some says 70RM .some says 95. I m totally confused. Is there ant specific rule to determine cable size? What would be the LT cable size to flow 500 Amp current? Ifte My e mail address is ifte13@yahoo.com Anyone please send me the answer to my e mail address, i will be very glad.

1 Answers  

---

what happens when back feeding supply accidently collapses with normal supply ??? How?? [that is sometimes in a substation 11kv feeder if their ws long time permit work, back feeding supply will provide from nearest substation... if accidently after the permit work,they charged the feeder without removing back feeding wat will happen...?]

1 Answers   KSEB,

---

why chock were used in old tubelights but are not newest tubelights?

0 Answers  

---

what will happen if secondary of potential transformer (220kv/110volt) of any metering core or protection core (cables) of any phase got earthed??

1 Answers  

---