Soares book on grounding and ieee 142 ground

As with the rest of the nec, it serves the purpose stated in article 90 to be sure the installation is,and remains,safe. Improving your skills in electrical grounding and bonding has never been easier. 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. Since grounding bonding is such a big part of power quality, i get a new book every 3 years. In my area, no one could even remember selling a grounding plate electrode. 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. For reference, see ieee 142 and soares book on grounding. Other readers will always be interested in your opinion of the books youve read. Also, ieee142 describes the correct way to provide an isolated ground and it isnt the method proposed by many.

Power systems green book and soares book on grounding use the same physics and. To ground handbook and the international association of. Principles of electrical grounding pfeiffer engineering. Soares book on grounding and bonding 9th edition by. Inspectors iaei soares book on grounding are recommended see access. The iaei book even gives some of the history of grounding requirements in the u. Consulting specifying engineer grounding requires more. Ieee recommended practice for grounding of industrial and commercial power systems commonly called the green book ieee std. This low resistance is required due to the high potential to earth of the electrical system. Ive been using soares book on grounding for 15 years. Feb 12, 2018 ground rods spaced less than two rodlengths apart will interfere with each other because their effective resistance areas will overlap fig.

Grounding has often puzzled experts and caused nonexperts to quake through the years. Join date jun 2005 posts 9,850 location md tractor kubota l3940 l5030 mf2054. That means the groundfault current return path to the source neutral utility transformer. 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. Soares book on grounding paperback january 1, 2002 by soares author 3. The problems of system grounding, that is, connection to ground of.

Soares book on grounding and bonding, th edition nec 2017. 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. The charter for this task group was to make the requirements more logical and to add. 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. This article isnt a preferred design specification. 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. The institute of electrical and electronics engineers, inc. The book explains how and why certain grounding methods are used in a logical way that balances text with photos and illustrations. Ieee recommended practice for equipment grounding and.

This recommended practice has served electrical engineers seeking electrical system grounding information since the first edition in 1956. Whether youve loved the book or not, if you give your honest and detailed thoughts. We could easily address 10 more top tips for article 250. First, the ground or grounding of a circuit is a misnomer. Grounding design calculations part four electrical knowhow. According to the ieee green book 3, the grounding electrode resistance of large electrical substations should be 1 ohm or less. 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. Soares grounding electrical distribution systems for safety. The grounding and bonding requirements in this column apply to solidly. May 02, 2017 soares book on grounding and bonding, th edition nec 2017 international association of electrical inspectors, kathryn p. Design, engineering, installation, and enforcement perspectives for grounding and bonding come together in this unique, handson electrical reference. 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.

The terms ground, grounding and grounded as defined by the national electrical code refer to earth or a connection to earth. 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. Soares book on grounding and bonding, th edition nec. For commercial and industrial substations the recommended ground resistance is 25 ohms or less. 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. Emerald book, ieee 142 the green book, and soares book on. Ieee142 and soares book on groundinguse the same physics and electrical theory as article 250. Article 250 grounding and bonding mike holt enterprises. Soares book on grounding and bonding international. This book is a revision of ieee std 142 1991, the ieee green book.

Connected to establish electrical continuity and conductivity. 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. It reflects the experience and sound judgment of a working group made up of engineers active in the design and operation of electrical. Facility and equipment grounding to enhance equipment. Design of grounding grid according to ieee standards. 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.

Ieee std 1422007 revision of ieee std 1421991 ieee. Also, ieee142 describes the correct way to provide an isolated ground. Also, ieee142 describes the correct way to provide an isolated ground and it isnt the method proposed by many equipment manuals. Connected connecting to ground or to a conductive body that extends the ground connection. 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. Power supply groundingearthing concepts automation. Jun 01, 2008 in trying to compare ground rod and ground plates, i made phone calls for pricing grounding plates. Soares book on grounding and bonding, th edition nec 2017 international association of electrical inspectors, kathryn p. 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.

Jul 01, 2014 ive been using soares book on grounding for 15 years. Always controversial and mysterious, grounding has puzzled experts and caused nonexperts to quake. 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. 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. 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. Magison has an excellent chapter human electrical safety. Soares book on grounding and bonding 9781890659738. Iaei has brought grounding down to earth in this updated book. So when you think of grounding, you could think of it as earthing to keep things straight in your mind. Soares, grounding electrical distribution systems for safety regards, phil corso email protected. When you consider that soares is a product of the international association of electrical inspectors, this division of labor makes sense. 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.

Obtaining a lowresistance connection to earth, use of ground rods, connections to water pipes, etc. 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. This book is a revision of ieee std 1421991, the ieee green book. 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 book on grounding and bonding, based on the 2011 nec. Its an easy read that is written for learning and understanding, not just a reference like nfpa 70 nec code book. Electric service to metal building, grounding, etc. Electrical inspectors publication, soares book on grounding and bonding. Soares contains some examples of maximum lengths as a function of.

Two good sources for more information on this are soares book on groundingand ieee 142. Principles of electrical grounding john pfeiffer, p. If you want to learn about grounding and bonding, this is the book. Usually ships within 24 hours click on the image to order or find more books like this. Ieee142 and soares book on grounding use the same physics and. Grounding also allows protective devices to operate during a fault condition the basic theory behind grounding is to keep the. Local codes may specify ground rod separation ieee std. Jan 01, 2002 soares book on grounding paperback january 1, 2002 by soares author 3.