How to know the back up time for a 5KVA UPS which is connected to 15 nos. of computers? Is there any formula for this? pls. tell me.

1 Answers   HAL,

---

Why indicate only 440V to 3-phase supply.

4 Answers  

---

why r we using shell transformer for low voltage

0 Answers  

---

11KV electrical line going through the forest in cloudy night ,how can we find the direction of line.

5 Answers   Bhel, Cesco, HZL, Nesco,

---

how do u gauge the size of the cable ?for eg. consider a 300 sqmm L.T Cable.How do u determine the size of the cable seeing it pratically?

0 Answers   Bhel, Jai Balaji, Rashmi Group,

---

why contactors are used ...? is contactors and relays are same ...?

5 Answers  

---

can we share mvar in parrelell connected alternators

2 Answers  

---

How to calculate impedance volt in Transformer?

0 Answers  

---

what is differnce between grounding and earthing or both are same?

3 Answers  

---

What is T’Q and X’Q and X’D ? and what is saturated as well as unsaturated ?

0 Answers   XX,

---

What is the function of UV coil ACB?

6 Answers   DLF,

---

what is the difference between KW and KWh?

9 Answers  

---