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)

HOW TO CALCULATE UPS BATTERY BACKUP TIME

3 Answers   HSBC, VRVS,

---

What is the difference between Earth and Neutral?

2 Answers  

---

What is meant by regenerative braking?

5 Answers  

---

what is CRGO Transformers?

6 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd, TATA,

---

can we produce cosine wave instead of sine wave? will it usefull?

4 Answers   BARC,

---

what is the procedure for three phase motor differential relay testing can it do with single phase test kit?

1 Answers   ABB,

---

the site measured knee point voltage of protection class CTs should be greater than rated knee point voltage? what about meetering class CTs. Should it be below the rated knee point voltage?

0 Answers  

---

what is the mechanical safety of DG ?

0 Answers  

---

What is the difference between shortcircuit current, rated current of cable & MCB with example? What will be the size of cable required for 5.5 KW motor (Full load current 10 Amps approx.), Starting current with DOL is 120 Amps. Aprrox. Short circuit current with LLLG fault is 2000 Amps Approx.

0 Answers  

---

If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.

0 Answers   MEIL,

---

how current is reverse from its normal direction during the fault?

0 Answers   HGF,

---

in gen traf what is ONAN , ONAF , OFAF and DYN

3 Answers  

---