How would we calculate the no of earthing pits required
for motor /panel
Answer Posted / ramkumar
it depends on the resisitivity of soiland time for fault
current to pass through(1 sec or 3 sec).there is a formula
which gives the area for earthing required.this is is
divided by area of one earth plate.this gives the no of
earthpits required.
| Is This Answer Correct ? | 15 Yes | 8 No |
Post New Answer View All Answers
What is miller crystal oscillator? Explain its operation?
define the non synchoronism of synchoronous machine in general g or m??
can you plz send l&t aptitude questions if available its urgent plz plz plz
What is the transfer function?
Damping resistor provided in open delta (tartiary) winding of a measuring PT at the incoming of a MV inverter drive panel is getting heated up. Can any body explain the reasons and suggest the remedy?
What is the limitation of kirchoffs law?
Why control of DC motor is simpler?
Why temperature rise is conducted in bus bars and isolators?
how to calculate the fault in substation
Show Details FROM:Muhammed Ikram TO:qa@allinterview.com Message flagged Saturday, June 4, 2011 10:07 PMMessage bodyHello all, i want to ask a question to all of you that what is VMM (voltage monitoring module )? how it work,s? i heard somewhere that it compare 1 phase voltage to other phase voltage. but there is also some setting on it. how to set it,s setting. please tell me briefly. Thank,s and Regard,s. Muhammed Ikram.
How I can Compare 120v/60Hz versus 220v/50Hz ? Please tell me both advantage and disadvantage ......
How to control motor gearbox speed and friquency? If length of cable and dia given, how to measure the voltage drop?
please give some hindalco placement papers for written exam
What should be the voltage between Neutral and Ground in secondary side of the step down transformer (230 V to 110 V) with no load condition?
list the type of vfd? wich is sutable for heating kiln?