What is the minimum distance between two earthing pits?

What is the minimum distance between two earthing pits?

6.2 Earth electrodes shall be embedded as far apart as possible from each other. Mutual separation between them shall usually be not less than 6.0 m ( which is twice the length of the electrode).

What is the distance of earthing?

Re: Distance Between Two Earth Pits Is it Plate Earthing or Pipe or Rod Earthing or Strip or Conductor Earthing? Vide Clause 9.2. 1 of IS 3043, for plate earthing, the normal separation distance between two plate earth electrodes is 10 meters, but a separation of 2 meter also can give you sufficient gain.

What is the minimum depth to which an earth electrode must be driven to?

8 ft
It shall be driven to a depth of not less than 8 ft except that, where rock bottom is encountered, the electrode shall be driven at an oblique angle not to exceed 45 degrees from the vertical or, where rock bottom is encountered at an angle up to 45 degrees, the electrode shall be permitted to be buried in a trench …

What is the minimum depth of electrode to reduce earthing resistance?

As per NEC code minimum ground electrode length of 2.5 meters (8.0 feet) to be in contact with the soil. Doubling depth of Rod theoretically reduces resistance 40%.

Which is the best location for the central electrode with respect to the earth electrode?

Location giving lowest reading on the ground tester is the most desirable. The location giving the lowest value for R has the lowest specific resistance for the soil to the chosen depth of 10 ft. The spot is likely to give you the best earth electrode.

How does the earth resistance depend on distance from earth electrode?

Length of Pipe Electrode and Earthing Pit After about 4 meter depth, there is no appreciable change in resistance to earth of the electrode. Except a number of rods in parallel are to be preferred to a single long rod.

How far apart should earth rods be?

The NEC requires all driven rods to be a minimum eight feet in the earth and for multiple connected rods a minimum spacing of six feet between rods.

How do you calculate earth pit?

Number of earthing pipe required = Fault Current / Max. current dissipated by one earthing pipe. Number of earthing pipe required = 50000/838 = 59.66 Say 60 No’s. Total number of earthing pipe required = 60 No’s.

What is the range of earthing resistance?

Ideally a ground should be of zero ohms resistance. There is not one standard ground resistance threshold that is recognized by all agencies. However, the NFPA and IEEE have recommended a ground resistance value of 5.0 ohms or less.

What is the minimum distance between two earthpits?

the minimum distance two earthpits should be twice the length of the earth electrode used i.e. for example distance between 2 3meters pit will be 6mts.

What is the minimum resistance required for earth pit?

Maintain less than one Ohm Resistance from EARTH PIT conductor to a distance of 15 Meters around the EARTH PIT with another conductor dip on the Earth at least 500 mm deep. Check Voltage between Earth Pit conductors to Neutral of Mains Supply 220V AC 50 Hz it should be less than 2.0 Volts. Factors affecting on Earth resistivity 1.

What is the span length between two earth pits?

As per IS 3043 & IEEE 80 we should maintain minimun “double the length of the earth electrode ” ie if your earth electrode length is of 3 mtr then the span length between two earth pit should be 6 mtr . Please tell me the locations of two earth pits. Then I can tell you the distance. For example;- 1 pit in California , other pit in New york.

What is the distance between two plate earth electrodes for earthing?

Vide Clause 9.2.1 of IS 3043, for plate earthing, the normal separation distance between two plate earth electrodes is 10 meters, but a separation of 2 meter also can give you sufficient gain.