Answer / habeebm

IP (Ingress Protection) codes define how well an enclosure
protects against the external environment.

As the number gets higher, the protection gets better.

The first digit defines the protection level
against "solids", the second against "liquids". You MUST
use both digits to define an enclosure.

For the first digit:
0 = No protection
1 = Protected against objects greater than 50 mm diameter
2 = Protected against objects greater than 12 mm diameter
3 = Protected against objects greater than 2.5 mm diameter
4 = Protected against objects greater than 1.0 mm diameter
5 = Dust protected
6 = Dust tight

For the second digit:
0 = Not protected
1 = Protected against dripping water (i.e. vertical plane)
2 = Protected against dripping water up to 15 degree angle
3 = Protected against spraying water
4 = Protected against splashing water
5 = Protected against water jets
6 = Protected against heavy seas
7 = Protected against effects of immersion
8 = Protected against submersion

Answer / suresh

The name plate details of a motor which r mostly have these
type of details. Duty, Insulation Class,Temperature
class,Gas Grouping,Protection Types.etc...
But most of the motors have E.// 2G EX-d, //I,T4, IP55. if
u want to know all these details u can refer the site
Hazardus area equipment.

what is the ohmic value of transformers

1 Answers  

---

WHY EXCITATION OF SYNCHRONOUS MACHINE IS DC NOT AC

8 Answers   NTPC,

---

A circuit breaker on detecting fault will a. Open b. Close c. Open and trigger the alarm

2 Answers  

---

why cannot we use a freuency more than 400hz is used in aircrafts?

1 Answers  

---

15 kva dg set single phase takes 63amp( approximate) while same rating 15kva three phase takes 35amp approximate. why ? and what will be per phase current for 15 kva

2 Answers   TVI,

---

---

what is the meaning of Ring Mean Unit in a substation or trasformer also tell me its oerpuse?

4 Answers   NPTC, NTPC,

---

How do you change an AC motor to DC? why there is only 50 Hz frequency in india & not other?

4 Answers   BSF, TATA,

---

we can stepdown the voltage from 230/12v ,and we use the voltage for various electronics components why can't we step up the voltage from 12/230v if we can shall we use the voltage for domestic single phase supply

5 Answers   Areva,

---

Can anybody post questions asked in Engineers India Limited Interview? Thanks in advance.

0 Answers   Engineers India Limited,

---

what is dead tank CT AND what is live tank CT

2 Answers   TATA,

---

Can we use MCCB with Auxiliary Contact in place of Contactor in a AMF System.

1 Answers   C&S, Farnek,

---

What is ERD used in Elevators??

1 Answers   Emerson,

---