INDECOPI, as the Peruvian Standardization Organism, established in July 1998 the Specialized Electric Safety Technical Committee - Grounding System, in charge of preparing the Peruvian Technical Norms.

These norms were approved by Resolutions of the Technical and Commercial -Regulations Commission No. 0062 and 0064-1999/INDECOPI-CRT and published in the Official Newspaper "El Peruano" on December 11 and 13, 1999.

The objective of this guide is to make available to a larger number of people a summary of the norms regarding a priority matter related to the safety of people and protection of investments in electrical and electronic equipment. Moreover, a second purpose is to interest readers in consulting the complete norms which will be available in the main libraries of the country.

We would like to thank the institutions and companies and their representatives, who participated actively and contributed their experience in the preparation of five (5) Peruvian Technical Norms related to the products that form part of the Grounding System.

PROCOBRE PERU

ALEPSA CEPER S.A. ELECSA S.A. ELCOPE S.R.L. INDECO S.A. PARA RAYOS S.R.L. SAKATA INGENIEROS S.A. SOCIEDAD NACIONAL DE INDUSTRIAS TECNOFIL S.A. TICINO DEL PERU S.A. TRIANON

ASOCIACION PERUANA DE CONSUMIDORES Y USUARIOS (ASPEC) (Peruvian Consumers and Users Association) MINISTRY OF ENERGY AND MINES (MEM) SUPERVISORY BODY FOR PRIVATE INVESTMENT IN ELECTRIC POWER - (OSINERG)

ASOCIACION ELECTROTECNICA PERUANA (AEP) (Peruvian Electronic Association)
Colegio de Ingenieros de Perú, Capitulo de Ingeniería Mecánica-eléctrica y Mecánica (Peruvian Engineer Professional Association, Mechanical - Electromechanical Engineering Chapter)
PONTIFICIA UNIVERSIDAD CATOLICA DEL PERU (Catholic University)
UNIVERSIDAD NACIONAL DE INGENIERÍA (National University of Engineering)
UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS (San Marcos University)

NTP 370.052:1999 ELECTRIC SAFETY. Materials to be used in a grounding well, 1st Edition dated December 13, 1999.

NTP 370.053:1999 ELECTRIC SAFETY. Selection of electrical materials for grounding in indoor installations. Copper protection guard wires, 1st Edition dated December 13, 1999.

NTP 370.054:1999 ELECTRIC SAFETY. Plugs and sockets with grounding connection for domestic and similar use in general, 1st Edition dated December 11, 1999.

NTP 370.055:1999 ELECTRIC SAFETY. Grounding system, Glossary of terms, 1st Edition dated December 13, 1999.

NTP 370.056:1999 ELECTRIC SAFETY. Grounding copper electrodes, 1st Edition dated December 13, 1999.

NTP 370.052:1999 MATERIALS TO BE USED IN A GROUNDING WELL

OBJECTIVE

To establish the conditions that must be complied with regarding the materials to be used in protection grounding wells that use copper electrodes.

Installations in public buildings, residential buildings, one-family houses or business premises. This Technical Norm includes the following: material surrounding the copper electrode of the protection grounding well, chemical elements to reduce grounding resistance, connectors between the guard wire and the electrode, inspection box; as well as recommendations for measuring grounding resistance.

Selection and installation of the materials must be made in such a way that:

• The grounding resistance value conforms to the protection norms and the resistance stability be maintained.
• That grounding fault and leakage currents circulate without danger, pursuant to thermal and electromechanical demand.
• Mechanical strength and protection are ensured, pursuant to estimate external influence conditions.

The materials are the following:

• Material surrounding the electrode.
• Chemical elements to reduce grounding resistance.
• Connectors between the electrode and the grounding conductor.
• External well protection.

The materials to improve the resistance value must not adversely affect the environment or harm life or fauna.

Written authorization must be obtained from the Ministry of Health or from Official Institutions in charge of environmental protection. .

Recommendations are established for measuring grounding resistance and the correct location of the measuring electrodes. Measuring methods are provided.

Establishes the conditions that must be complied with regarding electrical conductors to be used as guard wires necessary for the safety of people, animals and property, faced with danger or damage that can result from the use of electrical installations, under foreseeable conditions.

Indoor installations in public buildings, residential buildings, one-family houses or business premises, when the grounding guard conductor is a copper wire or group of copper wires. They can be Bare, covered or insulated.

The material must be copper, resistant to any type of corrosion or be adequately protected against corrosion. It can be solid or cabled, insulated, covered or bear

Indicated in NTP 370.048, both for insulation and materials.

Minimum section Tables are provided.

Established pursuant to the National Electricity Code in force, with the possibility that any variation will also modify that indicated in the Norm.

• C· Covered or insulated guard wire shall be yellow.
• Neutral conductor (if any) shall be white.
• Phase conductor can be black, blue or red.

Indications for inspections and electric continuity tests and Diagrams showing connections for 220V electrical systems in delta with grounding, 220V in delta without grounding, and 380/220V with grounded, continuous neutral.

To establish the requirements that must be complied regarding grounded plugs and sockets for connection of electrical conductors for use in homes and similar, in indoor and outdoor installations, with a nominal voltage above 50V but not higher than 250V and a nominal current no higher than 16A.

Fixed or portable plugs and sockets for alternate current, with grounding protection, for voltages over 50V but not higher than 250V and current not to exceed 16A, that are used in indoor and outdoor installations in residential buildings, one-family houses or business premises.

This Technical Norm is also applicable to plugs incorporated into cords and to plugs and sockets incorporated into extension cords. It is also applicable to plugs and sockets that are a component of an appliance, unless the Technical Norm establishes another condition for specific appliances.

This Technical Norm does not apply to:

• Plugs, sockets and adapters for industrial purposes.
• Adapter artifacts.
• Fixed sockets combines with fuses, automatic switch breakers, etc.

• Nominal Voltage: 250V
• Nominal Current:: 10A, 15A, 16A

The Technical Norm provides a detailed description of the standardized plugs and sockets.

To establish the definition of the most common terms used in the Grounding System Technical Norms,

Interpretation of the terms and definitions of the concepts which refer to the Peruvian Technical Norms, prepared by the Specialized Electric Safety Technical Committee - Grounding System, to be applied in electrical installations in public buildings, residential buildings, one-family houses or business premises.

It includes 60 definitions of terms.
In alphabetical order Index

To establish the characteristics that must be complied with regarding grounding copper electrodes, given their high degree of resistance to corrosion and to improve its grounding resistance.

Applied to protection grounding of electrical installations in public buildings, residential buildings, one-family houses or business premises that require it.

The type of specified electrodes are indicated for any type of soil, especially corrosive and of high resistivity, where it may be necessary to use several electrodes attached to each other, to obtain the adequate resistance value of the installation Grounding System.

Copper grounding electrodes can be one or a group of the following electrodes:

Copper rod electrode, with a nominal diameter of no less than 12 mm and a length of no less than 2.0 mm. The minimum depth to which it should be introduced is 2.5 m. If rock is found at less than 1.25 m deep, the electrode must be buried horizontally..

Electrode embedded in a concrete foundation, at least 5 cm from the base which is in direct contact with the soil. The electrode consists of a bare copper conductor of at least 6 m in length and a section of no less than 25 mm2. .

Compound electrode of a bare copper conductor, horizontally buried no less than 0.75 m deep. The electrode includes a bare copper conductor of at least 10 m long and a section of no less than 35 mm2.

Engraved on the copper Rod electrodes are the manufacturer's name or brand name, length in meters, diameter in mm and the initials NTP 370.056.

The mark shall be placed on the upper part so that it will not prevent normal contact of the electrode with the connector. .

SPECIFICATIONS

The Technical Norm provides technical characteristics, materials and reception tests.