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nualCollection Technique


Cahier technique no. 172
System earthings in LV

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R. Calvas B. Lacroix


Building a New Electric World


"Cahiers Techniques" is a collection of documents intended for engineers and technicians, people in the industry who are looking for more in-depth information in order to complement that given in product catalogues. Furthermore, these "Cahiers Techniques" are often consideredas helpful "tools" for training courses. They provide knowledge on new technical and technological developments in the electrotechnical field and electronics. They also provide better understanding of various phenomena observed in electrical installations, systems and equipments. Each "Cahier Technique" provides an in-depth study of a precise subject in the fields of electrical networks,protection devices, monitoring and control and industrial automation systems. The latest publications can be downloaded from the Schneider Electric internet web site. Code: Visit this section Section: Press Please contact your Schneider Electric representative if you want either a "Cahier Technique" or the list of available titles. The "Cahiers Techniques" collection ispart of the Schneider Electric’s "Collection technique".



Scientific and Technical Division Technical Communication

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no. 172
System earthings in LV

Roland CALVAS An ENSERG 1964 graduate engineer (from the Ecole Nationale Supérieure d'Electronique et Radioélectricité de Grenoble) and an Institut d'Administration des Entreprises graduate, he joined Merlin Gerin in 1966. During his professional career, he was sales manager, marketing manager in the field of equipment for protection of persons, thenTechnical Communication manager.

Bernard LACROIX An ESPCI 74 graduate engineer (from the Ecole Supérieure de Physique et Chimie Industrielle de Paris), he then worked 5 years for Jeumont Schneider, where his activities included development of the TGV chopper. After joining Merlin Gerin in 1981, he was then in turn Sales Engineer for UPS and sales manager for protection of persons. Since 1991 heis in charge of prescription for LV power distribution. ECT 172 updated December 2004


Earthing system -grounding system (US)60050-604 IEC: An arrangement of connections and devices necessary to earth equipment or a system separately or jointly. Electric Shock: Application of a voltage between two parts of the body Electrocution: Electric Shock resulting in death EMC: ElectroMagnetic Compatibility I∆n: Operating threshold of a RCD IMD: Insulation Monitoring Device GFLD: Insulation Fault Location Device MV/HV: Medium Voltage: 1 to 35 kV as in CENELEC (circular of the 27.07.92) High Voltage: 1 to 50 kV as in french standard (14.11.88)

(power) System earthing -(power) system grounding (US)60050-195 IEC: Functional earthing and protective earthing of a point or points in an...