Answer / brewed

There are many factors to consider when choosing cable
size .nd I will list just but a few.
1. You need to know the kind of load.
2. you need to know if its undergrond, overhead, in or out
doors
3. You need to know the temperature of your environment.
4. You need to consider the atmospheric pressure
With these and other facors you multiply them, depending on
your installation rules, to get a k factor which will then
depend on rated current carrying capacity of the cable at
hand.

Answer / s.arunkumar

1.Voltage level.
2.Type of cable going to used.
3.Whether the cable is going to laid in air,tray or in
burried.
4.Derating factor, Grouping Factor and ambient temperature.
5.Voltage drop as per the standards.

Answer / fida

I am using transformer turn ratio tester for 250KVA 13.8KV
primary and 220V secondary transformer what should be the
correct values of turn ratio test how i assume the correct
values for turn ratio.

Answer / leturtle

It is normal practice to have a rating for the earthing
system commensurate with the maximum system design fault
level. The normal maximum 400kV fault level is 63kA 1s.
Take the formula from EA TS 41-24 [6]

If you can't find it go to www.ees-group.co.uk on the FAQ
section.

what is tan delta point in a current transformer?

2 Answers  

---

how to find the ballast lost from the actual wattage? for example i am going to buy decorative type 2x36watts fluorescent light fitting for this lamp how to find the ballast lost? is there any formula?

2 Answers   MEIL,

---

sometime battery charged and then automatically charged when rectifier ON conition, is there any chances please clarify the same.

0 Answers  

---

Vaccum circuit breaker

0 Answers  

---

for hipot test on 33kV busbar, we will test on 70 kV or 56kV, what is the acceptable leackage current?

0 Answers  

---

what is called star connection and delta connection also purpose of this connections?

3 Answers   Siemens,

---

How to select the different contactors ( starter combination) for different AC motors? what about fuse cappacity 4 different motors too?

2 Answers   Equate,

---

Define delay time.

0 Answers  

---

what is induction relay

1 Answers  

---

Does induction motor start with dc power supply????

4 Answers   Essar,

---

If the load of transformer is getting more than its rating,,,than how to overcome this problem? Suppose thee rating of transformer is 315kva and the load is going beyond than the rating say around load: 352kva... Than how can we solve this problem without deducting the load.

14 Answers   Hyundai,

---

Why X'mer rating in kva only?

4 Answers  

---