As with the rest of the nec, it serves the purpose stated in article 90 to be sure the installation is,and remains,safe. Soares book on grounding and bonding 9781890659738. Ieee std 142 2007 revision of ieee std 142 1991 ieee recommended practice for grounding of industrial and commercial power systems sponsor power systems engineering committee of the ieee industry applications society approved 7 june 2007 ieee sa standards board. Jun 01, 2008 in trying to compare ground rod and ground plates, i made phone calls for pricing grounding plates. Magison has an excellent chapter human electrical safety. Join date jun 2005 posts 9,850 location md tractor kubota l3940 l5030 mf2054. Article 250 grounding and bonding mike holt enterprises. The charter for this task group was to make the requirements more logical and to add. Ansiieee standard 142, recommended practice for grounding of industrial and commercial power systems green book and soares book on grounding use the same physics and electrical theory as art. Improving your skills in electrical grounding and bonding has never been easier.
Power systems green book and soares book on grounding use the same physics and. Soares book on grounding paperback january 1, 2002 by soares author 3. Electric service to metal building, grounding, etc. Ieee recommended practice for equipment grounding and. Its an easy read that is written for learning and understanding, not just a reference like nfpa 70 nec code book.
Since grounding bonding is such a big part of power quality, i get a new book every 3 years. Inspectors iaei soares book on grounding are recommended see access. Whether youve loved the book or not, if you give your honest and detailed thoughts. Soares grounding electrical distribution systems for safety. List typical values of resistivity from bs 7430 and ieee 142, list all applicable standards for grounding system design calculations for domestic, commercial and industrial premises, list acceptable values for earthing resistance, calculate soil resistivity by using ground testers that apply the wenner 4point method.
Soares book on grounding and bonding 9th edition by. When you ground, you connect something to the earth you can read more about this distinction in the ieee142, the green book and in the national electrical code, article 250 and in other sources. So when you think of grounding, you could think of it as earthing to keep things straight in your mind. When you consider that soares is a product of the international association of electrical inspectors, this division of labor makes sense. Power supply groundingearthing concepts automation. Ieee std 142 2007 revision of ieee std 1421991 ieee recommended practice for grounding of industrial and commercial power systems sponsor power systems engineering committee of the ieee industry applications society approved 7 june 2007 ieeesa standards board. The book explains how and why certain grounding methods are used in a logical way that balances text with photos and illustrations.
Soares book on grounding and bonding based on the 2017 nec is a stepbystep guide through the bonding and grounding related language and intent of the 2017 national electrical code. This article isnt a preferred design specification. Per the ieee the green book, standard 1422007 recommended practice for grounding industrial and commercial power systems, the term ground is defined as a conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some other body that serves in place of the earth. This low resistance is required due to the high potential to earth of the electrical system. Information is given on how to ground the system, where the system should be grounded, and how to select equipment for the ground of the neutral circuits. In the late 1990s, because there was so much confusion on this topic, the nec correlating committee formed a special task group for usability to tackle article 250. Design, engineering, installation, and enforcement perspectives for grounding and bonding come together in this unique, handson electrical reference. The problems of system grounding, that is, connection to ground of neutral, of the corner of the delta, or of the midtap of one phase, are covered. Soares book on grounding and bonding, th edition nec. To ground handbook and the international association of. Grounding also allows protective devices to operate during a fault condition the basic theory behind grounding is to keep the. That means the groundfault current return path to the source neutral utility transformer. Also, ieee142 describes the correct way to provide an isolated ground. The grounding and bonding requirements in this column apply to solidly.
First, the ground or grounding of a circuit is a misnomer. Soares book on grounding and bonding international. Reactance grounding zreactor connected between system neutral and ground reduces the ground fault current between phase and ground usually higher fault current than low resistance grounding better coordination with fault currents on multigrounded system. Not only does this book explain how and why certain grounding methods are used, but it does so in a logical way, balancing text with photos and illustrations. Ieee standard 142 indicates that ground plates can be buried either horizontal or vertical on edge and is the preferred method because a minimum of excavation is required. Article 250 covers the grounding requirements for providing a path to the earth to reduce overvoltage from lightning, and the bonding requirements for a lowimpedance fault current path back to the source of the electrical supply to facilitate the opera. Ieee recommended practice for grounding of industrial and commercial power systems commonly called the green book ieee std. It reflects the experience and sound judgment of a working group made up of engineers active in the design and operation of electrical. If you want to learn about grounding and bonding, this is the book. Iaei has brought grounding down to earth in this updated book. Emerald book, ieee 142 the green book, and soares book on.
The terms ground, grounding and grounded as defined by the national electrical code refer to earth or a connection to earth. Grounding design calculations part four electrical knowhow. Always controversial and mysterious, grounding has puzzled experts and caused nonexperts to quake. Other readers will always be interested in your opinion of the books youve read. Another item to consider, if your putting a subpanel in same building or separate building the new equipment grounding conductor is usually larger than any lug size available on the service panel ground bus, so you end up having to add appropriate sized lugs to the ground bus of the service panel.
Connected to establish electrical continuity and conductivity. Soares book on grounding and bonding, th edition nec 2017 international association of electrical inspectors, kathryn p. Soares book on grounding and bonding, based on the 2011 nec. Jan 01, 2002 soares book on grounding paperback january 1, 2002 by soares author 3.
Facility and equipment grounding to enhance equipment. In my area, no one could even remember selling a grounding plate electrode. May 02, 2017 soares book on grounding and bonding, th edition nec 2017 international association of electrical inspectors, kathryn p. Feb 12, 2018 ground rods spaced less than two rodlengths apart will interfere with each other because their effective resistance areas will overlap fig.
This recommended practice has served electrical engineers seeking electrical system grounding information since the first edition in 1956. Also, ieee142 describes the correct way to provide an isolated ground and it isnt the method proposed by many. This book is a revision of ieee std 142 1991, the ieee green book. Consulting specifying engineer grounding requires more. Ieee std 1422007 revision of ieee std 1421991 ieee. Electrical inspectors publication, soares book on grounding and bonding. For reference, see ieee 142 and soares book on grounding. According to the ieee green book 3, the grounding electrode resistance of large electrical substations should be 1 ohm or less. The iaei book even gives some of the history of grounding requirements in the u. Ive been using soares book on grounding for 15 years. For commercial and industrial substations the recommended ground resistance is 25 ohms or less. This book is a revision of ieee std 1421991, the ieee green book.
Jul 01, 2014 ive been using soares book on grounding for 15 years. Ground earth resistance in low voltage earth resistance in low voltage 2014 explains how and why certain grounding methods are used, but it does so in a logical way, balancing text with photos and illustrations. Eustace soares book, grounding electrical distribution systems for safety was originally published in 1966 and was based upon the 1965 edition of the national electrical code. The institute of electrical and electronics engineers, inc. Grounding has often puzzled experts and caused nonexperts to quake through the years. Ieee142 and soares book on grounding use the same physics and. Ieee142 and soares book on groundinguse the same physics and electrical theory as article 250.
See all formats and editions hide other formats and editions. Usually ships within 24 hours click on the image to order or find more books like this. Cutting through the confusion of industry jargon and common misconceptions, and using correct defined terminology, the authors guide the reader stepbystep through the language and. Soares, grounding electrical distribution systems for safety regards, phil corso email protected. Obtaining a lowresistance connection to earth, use of ground rods, connections to water pipes, etc. Principles of electrical grounding john pfeiffer, p. Soares book on grounding and bonding, th edition nec 2017. Local codes may specify ground rod separation ieee std. Connected connecting to ground or to a conductive body that extends the ground connection. The problems of system grounding, that is, connection to ground of. We could easily address 10 more top tips for article 250. Two good sources for more information on this are soares book on groundingand ieee 142. Grounding is one of the means of safeguarding employees and the public from injury other means include, but are not limited to, guarding, adequate clearance above ground, proper burial depth, etc. Soares has long been the grounding standard for field people in the electrical industry, while ieee 142 has long been the grounding standard for electrical engineers.