Answer / abhishek kesarwani

see the first digit stands for protection against solid and
second digit stands for liquid protection...

IP 54:- 5 (first digit)- limited particles of dusts can
enter in the panel,
4 (second digit)- if the water is splashed from any
direction then also it can not approach to the components.

IP 55:- first digit is same so please see above.
5 (second digit) The panel shall be protected against low
pressure jet from any direction.

Hope my answer shall satisfy.
If any more clarification needed please send mail on my mail
id so that i can reply you.

Answer / neeraj dubey

IP54 enclosures have a high level of protection against particles, and a fair amount of protection against water and IP55 enclosures that demonstrate almost complete protection from particles and a good level of protection against water.

why the flooring of substation is done with small pebbles or stones..?

16 Answers  

---

what is difference between bus coupler and auto transfer switch

0 Answers   Dubai Properties Group,

---

what is relation between torque and speed / rpm?

1 Answers  

---

I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

0 Answers  

---

In a voltage-controlled current source A A current booster is never used B The load is always floated C A stiff current source drives the load D The load current equals Isc

0 Answers  

---

10 tube light connect in mcb breaker.one tube light is fault.so breaker is tribe.how fault is rectified.(using 3wire phase,earth,neutral)

0 Answers   CTS, Jindal,

---

What does a permanent magnet generator do?

1 Answers  

---

what is the significance of per unit impedance ?

7 Answers   HP,

---

What is SMPS,How does it works?

4 Answers   Bharti, TCS,

---

sir please send me techinical questions for junior engineer posting in bangalore railway i am diploma holder

0 Answers   RRB,

---

we have 3*1 MW generator one NGR is common for all it will be selected during paralle our problem is two generator ca be paralled but when slecting third one we need to close NGR selection on third one other wise voltage not matching why?

1 Answers  

---

howmuch current can carry the 2.5Sqmm copper cable?

42 Answers  

---