Answer / abdurrahim

For pipe earth pit its maximum 2 ohms and for grid it is
considering below 0.02 ohms..
to measure resistance for earth..there is one instrument
call earth resitance testor.Its value in ohms.
Resistivity means resitance/ meter...

Answer / kashifhabib

I dont agree with your answer

Earth Resistance can be measured with Megger.
Maximum Earth resistance should be 1 Ohm (Accroding to IEEE)
Maximum Earth resistance should be 2 Ohm (Pakistan WAPDA)

need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

0 Answers  

---

How to identify phases in the transformer like motor and AC generator but one condition without phase indication like(RYB,UVW)?

1 Answers  

---

WHy neutral to ground trips when neutral touches the ground

1 Answers  

---

hii.i am a B.TECH(EEE) graduate.i want 2 know wat type of qusns r asked in sbi clerk interview 2 candidates like me??kindly post answers ASAP..

1 Answers  

---

what is bus pt and what is the function of it ???

8 Answers   TATA,

---

What do you mean by per capita requirement of electrical energy in india

0 Answers   Tech Mahindra,

---

for selection of transformer we will considering 5 to 6 times of starting current of higher rating motor connected to secondary side. according to process wise we will start the motors gradually suppose if we will start 15 to 20 motors at a time wat will happen?

1 Answers  

---

if we use fuse in neutral what will happen?

9 Answers   L&T,

---

in slip ring motor if motor specification is given how we calculate its rotor resistance in starting

1 Answers  

---

what is Anti-pumping?

0 Answers  

---

Why in ESP Positive earthed

0 Answers   Sonhira,

---

when voltage gets down the current of motor increases. but according to Ohm's law voltage is directly proportional to current. plz explain

4 Answers   Maruti Suzuki, TATA,

---