Answer / sureshbabu

for the grid connected system the earthing value must be
below the limit of 1 ohm
for the individual connected system the earthing value must
be less than 5 ohms
this is the IEC standard for earthing and bonding

Answer / k.prakashchandra

In case of stations ,the maximum recommended values are
33KV-5 ohm, 66 KV -2, 110 to 400- 1.0 and generating station
-0.5.

Answer / simon

1 Ohm MAX in domestic purpose.

Answer / mohan babu bommu

there is no hard and fast rule in large sub stations 1ohm small substatioms 2ohms ither places up 6ohms permissable

Answer / sandip

UP TO 10 OHM IT IS OK

define as synchronous generator

0 Answers   Enercon,

how earth resistance can be improved in dry soil

0 Answers   BARC,

how to convert psi into kilo pascal? what is the suction pressure & discharge pressure of chiller?

1 Answers  

how to get more than 1000 ohms between 2 earth pits ?

2 Answers   HCL,

what is the meaning of WYE and DELTA in Electric meter?

0 Answers  

We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

0 Answers   Siemens,

Which power will flow first if we switch on a motor Active or Reactive? How?

3 Answers  

in a plug point why the hole size at the top is large?

9 Answers   Bhel, TCS,

It is desired to flood light the front of a building 42 meters wide and 16 meters hig.Projectors of 30 degree beam spread and 1000 watt lamps giving 20 lumen/watt are availabl.If the desired level of illumination is 75 lumen/m and show a suitable scheme.Assume the cofficient of utilization, deprecitation factor and waste light factor are 0.4, 13 and 1.2 respectively.

0 Answers  

what is the best way to start a 15 KW motor for pump star-delta or direct on line ? and from how many KW i must use direct on line ?

1 Answers  

AC covered area by ton calculation

2 Answers  

why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?

0 Answers