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
Moto DX Safari – Mountaintop Ham Radio Camping Via Honda Gold Wing With Icom, Aspect Solar and MFJ Enterprises
“I had to figure a way to combine my moto addiction with my penchant for amateur radio and spend some quality time under a tree, o... Read more
Additional Amateur Radio-Related Petitions Now Open for Comment
The FCC has placed three Amateur Radio-related Petitions for Rule Making (PRMs) on public notice and has invited comments. Jerry Oxendine, K4KWH, of G... Read more
Sweden’s SAQ Announces Annual Alexanderson Day VLF Transmission on July 1
Sweden’s World Heritage Grimeton Radio Station SAQ Alexanderson alternator will be on the air on July 1 on 17.2 kHz for its annual Alexanderson Day tr... Read more
IARU update regarding Amateur Satellite allocations
The second week of the World Radiocommunication Conference reports on the status of two issues affecting the amateur satellite service. In a report wr... Read more
National Hurricane Conference Amateur Radio Sessions to be Live Streamed
Sessions focusing on the role of Amateur Radio in major weather events will be a part of the 2016 National Hurricane Conference, set for later this mo... Read more
![CS108G+ HF Radio [ Pre-Order ]](https://qrznow.com/wp-content/uploads/2016/11/CS108G_Front__73855.1479246571.1000.1200-265x168.jpg)
CS108G+ HF Radio [ Pre-Order ]
CS108G+ is an upgraded version of the X108G from Xiegu. Besides the standard features as will be described below, this version has a built in Spectrum... Read more
All about repeaters – Ham College 12
All about repeaters. More Technician exam questions. Read more
ASTRON POWER SUPPLIES – Catalog
ASTRON POWER SUPPLIES DOWNLOAD the Complete PDF catalog (1.4 MB) Read more
ICQPodcast – Solar Powered Shack released
In this episode, Martin M1MRB / W9ICQ is joined by Caryn-Eve Murray KD2GUT, Ed Durrant DD5LP , Dan Romanchik KB6NU, Martin Rothwell M0SGL and Chris Ho... Read more
W1AW/5 Will Represent ARRL Headquarters in the 2015 IARU HF World Championship
W1AW/5 The summer’s most popular HF contest — The 2015 International Amateur Radio Union (IARU) HF World Championship — gets under way on... Read more
The K7RA Solar Update
No significant solar activity over the past week, and still no sunspots observed since the end of April. According to Spaceweather.com, the percentage... Read more
Oldest, Longest-Licensed US Ham, Educator Charles Hellman, W2RP, SK
Charles “Charlie” Hellman, W2RP, of Hastings on Hudson, New York, died on January 25. He was 106 and may have not only been the oldest surviving radio... Read more
FCC: Supplier’s Declaration of Conformity Procedures are Now in Effect
The FCC is reminding electronic device retailers that Supplier’s Declaration of Conformity (SDoC) procedures are now in effect and being enforced. In... Read more
The Abandoned Microwave Towers That Once Linked the US
The Abandoned Microwave Towers That Once Linked the US by JORDAN G. TEICHER AT&T MADE HISTORY 63 years ago when it launched the $40 million... 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}