Introduction
Number of Earthing Electrode and Earthing Resistance depends on the resistivity of soil and time for fault current to pass through (1 sec or 3 sec). If we divide the area for earthing required by the area of one earth plate gives the number of earth pits required.
There is no general rule to calculate the exact number of earth pits and size of earthing strip, but discharging of leakage currentis certainly dependent on the cross section area of the material so for any equipment the earth strip size is calculated on the current to be carried by that strip.
First the leakage current to be carried is calculated and then size of the strip is determined.
For most of the electrical equipment like transformer, diesel generator set etc., the general concept is to have 4 number of earth pits. 2 no’s for body earthing with 2 separate strips with the pits shorted and 2 nos for Neutral with 2 separate strips with ….Read Full Article
Recent Posts
ARRL Handbook 2018
The Handbook: a Lifetime of Learning. BONUS OFFER! First Ever ARRL Member Call Sign Badge (details below). The ARRL Handbook for Radio Communications ... Read more
DR4020 Dual band Digital QRP radio
A simple QRP digital transceiver. — Fully assembled and tested– Perfect for outdoor digital radio contacts,such as FT8,FT4,JT65 etc. Band: 20... Read more
RS-R30 Remote Control Software Available for the IC-R30 Communications Receiver
RS-R30 – ICOM After recently being demonstrated at the Tokyo Hamfair, we are pleased to announce that the new RS-R30I (for iOS)/RS-R30A (for An... Read more
Radio Amateurs in Cuba Stand Ready for Hurricane Matthew
With the Meteorological Institute of Cuba forecasting that Hurricane Matthew will affect eastern Cuba on Monday and Tuesday, all Amateur Radio emergen... Read more
SPE Expert 2K-FA Linear Amplifier
SPE Expert 2K-FA Product Specifications The smallest in its class. Built-in Power supply and Automatic Antenna Tuner. Dimension: L 38, H 18.3, P 43 cm... Read more
Morse Telegraph Key History | Electronics+Radio
The Morse key has undergone considerable development since the first Morse telegraph messages were sent. Watch this fascinating video with many differ... Read more
MRF1K50H: 1500 W CW over 1.8-500 MHz, 50 V Wideband RF Power LDMOS Transistor
This high ruggedness device, MRF1K50H, is designed for use in high VSWR industrial, scientific and medical applications, as well as radio and VHF TV b... Read more
AMSAT Reports RadFxSat (Fox-1B) Completes P-POD Integration
AMSAT Vice President Engineering Jerry Buxton, N0JY, on August 15 delivered RadFxSat (Fox-1B) CubeSat, built in partnership with Vanderbilt University... Read more
Highlights of Five Years of SDO / NASA (2015-04-15) by NW7US
— Tomas / Amateur Radio Operator, NW7US ( http://NW7US.us ) – Twitter: https://Twitter.com/NW7US – Facebook: https://www.facebook.co... Read more
JT9 activity days ‘Make haste slowly’ 22-23 August 2020
Dear Fellow Radio Amateurs, We invite fans of digital modes of radio communication to JT9 activity days ‘Make haste slowly‘ which will tak... Read more
![Versa Beam Lite Version [ Japan ]](https://qrznow.com/wp-content/uploads/2016/11/main403-265x168.jpg)
Versa Beam Lite Version [ Japan ]
Versa Beam The Kohjinsha was developed over the course of two years from conception, to obtain the release was well received all of the expansion and... Read more
ES-4 Radio / Antenna Selector Switch between 3 radios and 5 antennas
ES-4 COMES AS A CONTROL UNIT AND A BASE (SWITCHING) UNIT THE BASE UNIT RECEIVES 12V POWER AND HAS ALL THE HEAVY COAXIAL CABLES CONNECTED TO IT. THER... Read more
INAC AX-330 – HF Antenna
HF Antenna AX-330, is an antenna that covers the spectrum of HF of 3.4 Mhz. 30.5 MHz continuously. Two loops tuned remotely by two servo motors, fed s... Read more
Straight Key Vs Paddle – Beginning Learning Morse Code
N4PBQ discusses the differences of learning to send Morse code on a straight key versus a paddle. Read more
Happy birthday Samuel Morse !
The creator of Morse code and the single wire telegraph was born on this day back in 1791. Today marks the birthday of the brains behind Mors... Read more
Warning: file_get_contents(https://plusone.google.com/_/+1/fastbutton?url=https%3A%2F%2Fqrznow.com%2Fhow-to-determine-correct-number-of-earthing-electrodes-strips-plates-and-pipes%2F): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in /home/qrznow/public_html/wp-content/themes/goodnews5/framework/functions/posts_share.php on line 151
){kind=link}