Creating a standard

The general procedure for applying a standard begins with the creation or adoption of a standard for said product or service. CENAM has different committees for these standards. In the case of ISO, its standards may be mandatory by some international agreement, which had to be ratified by the Senate of the Republic like any international treaty. In the case of those issued by a regional or national official body of another country, such as the European Committee for Standardization of the European Union[10]​ or the ANSI of the United States, the standard only covers a recommendation character but its use may be required by lateral treaties such as a Free Trade Agreement. In the case of purely Mexican products or services, the standards issued by the technical committees of specialized civil organizations, such as the Tequila Regulatory Council, may be adopted.

These standards can be taken entirely from the source, although with their due translation into Spanish and their adaptation to the standard of Mexican regulations, but the legal rights for the use of the intellectual content must be obtained through CENAM or the DGN, which can be granted by previous international treaties, such as those corresponding to the general procedures for the evaluation of conformity issued by ISO and which in Mexico receive a double name. (NMX-CC-004:1995/IMNC-ISO-9002:1994. Quality Systems - Model for Quality Assurance in Production, Installation and Service.).[17]​[18]​[19]​.

In the case of similar standards such as, for example, NOM-001-SEDE and the NEC,[20]​ that deal with the use of electrical energy in low voltage. Through commercial exchange, technical committees create a national standard, adapting the general ideas of the foreign standard, which sometimes involves obtaining the rights to the foreign work. In the aforementioned case, the index of both works is very similar. Another is the case of the adoption or homogenization of a common standard, which involves an international treaty by which the technical part is left to only one country or to both countries, both countries being obliged to abide by it without modification. This can be seen in the list of products of Cables Monterrey"), today Viakon"),[21][22]​ whose products are standardized based on tests carried out abroad with a foreign standard, but endorsed, for their application in Mexico, by an international treaty.[23]​.

In all cases, draft standards must be issued, which are freely made known to the organizations interested in the matter, which can issue observations for their modification during a determined period of time[24]​.

nsayos%2FListas_Verificacion]</ref> which indicates the steps that the UV must follow to issue a certificate of compliance or conformity with the standard to the natural or legal person who requests it (usually called client), or, where appropriate, issue one or more documents of non-compliance or non-conformity, which can be saved with subsequent verification procedures where the client must demonstrate that it complies with the standard and must be granted the certificate of conformity. If for some reason the verifier does not want to issue the certificate, the client may complain to the body that endorses the verifier, obliged to review the procedure, after which it can obli=blogcategory&id=179&Itemid=217]</ref>[25]​[26]​.

Verification of evidence

Procedures for compliance with a standard are rarely based on qualitative parameters, and the procedures and test results usually requested in standards are quantitative. Therefore, the tests must be carried out in testing laboratories or in the field with measurement devices endorsed by CENAM, either directly or through accredited laboratories or organizations (such as the Federal Consumer Protection Agency (Profeco)[27]​[28]​ In the case of scales in public markets, the laboratory – which is almost always a legal entity –, after carrying out a calibration procedure for a client or verifier on its equipment, can issue a certificate. calibration of the equipment that indicates at least an official number, the calibration date and the validity of the calibration, after which the equipment must be recalibrated and the standard deviation that the device suffers with respect to the calibration standard, in addition to the characteristics that make that equipment unique, such as the equipment serial number, the model and the manufacturer.[29]​.

The calibration is done by comparing the equipment with national standard units), protected by Cenam and serve as a national standard for the calibration of the equipment of each accredited laboratory. For a calibration to be successful, the measurements of the calibrated equipment must be within a deviation range. If for some reason they are not, the equipment can be ordered to be repaired, but if its condition cannot be resolved, the device can be declared useless and a certificate is issued that disables it.

In any case, the measurements recorded on a paper signed by the person who took them and by the person responsible for the measurement carried out by the verifier himself, through the client or through a third party with calibrated equipment, must be accompanied by the official number of the calibration certificate, the dates of issue and validity, the model, the manufacturer and the serial number. In some cases, the measuring equipment can be manufactured with a calibration such that it is not considered necessary to send it to be calibrated, since, due to its characteristics, use and admissible deviation, it can be considered stable throughout its life, as long as it is not altered, as is usually the case with the flexometers that are used daily in construction and that carry the general trade number of calibration per batch, since they comply with a given standard that ensures this. This does not happen with wooden rulers for measuring fabrics, which must be calibrated.[29]​.

If a calibration certificate is issued, a label is attached to each piece of equipment indicating the official calibration number and validity, with the idea of ​​avoiding the application of the calibration certificate to uncalibrated equipment that is the same as even though it is calibrated.[30]​[31]​.

Verification costs

The cost of the services of a verifier as well as the certifying laboratory are regulated and standardized by the Ministry of Economy "Secretaría de Economía (Mexico)") or another appropriate agency, which may establish a single rate or depend on something, such as the number of pieces or the surface to be verified [32]​.

Contenido

Existen, según la Ley Federal sobre Metrología y Normalización, dos tipos de normas:.

Official Mexican Standard NOM

Thus, these standards are mandatory for those who fall within the scope of their application and when the activities or products are carried out during their validity. These standards are ordinarily published in their entirety in the Official Gazette of the Federation and are even published in electronic media, so they can be considered public access and free distribution, as long as they are not altered, although to refer to them those published by the Official Gazette of the Federation must be used.

Mexican Standard NMX

The Mexican standards, known by their acronym as NMX standards, created in Article 3 Section

Consequently, these are rules of non-obligatory use for those who fall within the scope of their application and when the activities or products are carried out during their validity. The application of this type of standards may be mandatory if it is referred to in a NOM to do something, as occurs in the case of NOM-002-SEDE-1999,[34]​ with respect to the standards NMX-J-116-ANCE and NMX-J-169-ANCE. These standards used to be published in full in the Official Gazette of the Federation and could even be obtained in electronic media since they were issued by public government entities, but recently the government has transferred responsibility to private organizations related to the matter such as, for example, the Association for Standardization and Certification, A.C.") (ANCE"))[35]​ or the IMCA, which license their use through a monetary payment or participation in its preparation, so they can be considered accessible. restricted and distribution denied to those who acquire it, when sold with a serial number, and is usually given with a license document for the exclusive use of the natural person.

Las normas se identifican por un título que indica su aplicación general y un número de identificación, formado por:[36]​[37]​.

• - Tres letras. El tipo específico de norma, NOM para las Normas Oficiales Mexicanas y NMX para las Normas Mexicanas. Cuando le antecede a estas letras una P (pe) o PROY el texto es solo un proyecto de norma y como tal no se puede usar, ya que podría modificarse, en caso de haber observaciones que se reúnan en el comité técnico que la elabora. La sigla EM indica un estado de emergencia y previene sobre los objetos o situaciones.

• - Tres dígitos. Es un código numérico específico de la norma, indicado por tres dígitos del 001 al 999, que es un número que siempre conserva la norma en sus diferentes versiones o refrendos. En ocasiones, una misma norma se emite en varias, ya que resulta más fácil actualizarla y revisarla; para indicarlo, se coloca una diagonal y un par de dígitos entre 01 y 99.

• - Tres o cuatro letras. Siglas de la secretaría de estado") o dependencia(-as) involucrada(-as) en el estudio, en la emisión y en la realización de los procedimientos de verificación, el cual se compone por tres o cuatro letras, según la secretaría en cuestión. Estas pueden variar entre revisiones, ya que la secretaría de estado") o dependencia puede crearse, modificar nombre u objetivos o desaparecer. Además, lleva un número al final de las letras, que indica el comité que las revisa, en algunas ocasiones lleva 1, 2 o 3, según el comité consultivo que las revisa.

• - Cuatro dígitos, que indican el año que se publicó en el Diario Oficial de la Federación. Esto suele confundirse con la entrada en vigor, pero por el tiempo de transición la entrada en vigor puede ser hasta el año siguiente de su publicación.

• - Organización: En las normas NMX, es usual colocar las siglas del organismo privado responsable de la norma, como puede ser la ANCE"). O entre el identificar de tipo NMX y el número de la norma se coloca una letra que indica el área técnica que realizó la norma.

Examples of standards

• - NOM-018-STPS-200")0: Official Mexican Standard 018 of the Ministry of Labor and Social Welfare "Secretaría del Trabajo y Previsión Social (Mexico)") (STPS "Secretaría del Trabajo y Previsión Social (Mexico)"), which came into force in 2000. It describes the system for the identification and communication of hazards and risks regarding dangerous chemical substances in the workplace.

• - NOM-003-CNA-1996: Mexican Official Standard number 003 of the National Water Commission (CONAGUA), which came into force in 1996. It stipulates the requirements for the construction of water extraction wells "to prevent contamination of aquifers").

• - NOM-251-SSA1-2009:[38]​ Hygiene practices for the processing of food, beverages or food supplements. This standard cancels the official Mexican standards NOM-120-SSA1-1994, Goods and services. Hygiene and health practices for the processing of food, non-alcoholic and alcoholic beverages, and NOM-093-SSA1-1994, Goods and Services. Hygiene and health practices in the preparation of food offered in fixed establishments, published in the Official Gazette of the Federation on August 28, 1995 and October 4, 1995, respectively.).

• - NOM-003 SEGOB/2002: Describes Signs and notices for Civil Protection; including colors, shapes and symbols to use.

• - NMX-TT-002-1997-IMNC: Minimum quality requirements for institutions that offer training plans and programs for tourism and work in that area.

• - NMX-AA-127-SCFI-2006: Potabilization of water for use and human consumption: sodium polyphosphate. Specifications and test methods*.

• - NMX-J-010-1996-ANCE: Electrical-conductive products with thermoplastic insulation") based on polyvinyl chloride, for installations up to 600 V. Specifications. (This standard cancels the previous one, NMX-J-010-1993-SCFI.).

• - NMX-F-605-2004-NORMEX; Hygienic handling in the service of prepared foods to obtain the H Distinction.

• - PROY-NOM-157-SEMARNAT-2009: Draft Official Mexican Standard that establishes the elements and procedures to implement mining waste management plans. (Official Gazette of the Federation, December 4, 2009.

• - PROY-NOM-SSA2-043-2002: Draft Official Mexican Standard, basic health services. Promotion and education for health in food matters. Criteria to provide guidance.

• - NOM-EM-158-SEMARNAT-2009: Official Mexican Emergency Standard, which health regulates the import of natural Christmas trees of the species of the Pinus and Abies genera, and the species Pseudotsuga menziesii, to prevent the entry into the country of the following pests associated with them: Vespula germanica, Choristoneura fumiferana, Choristoneura occidentalis, Deroceras reticulatum, Diprion similis"), Orgya pseudotsugata"), Paradiplosis tumifex"), Grovesiella abieticola"), Rhabdocline weirii"), Nalepella ednae"), Epitrimerus pseudotsugae") and Phomopsis lokoyae").

• - NOM-EM-010-SCFI-2003: Emerging Standard for Trailers and Semi-trailers – Safety Elements for new and used units coming mainly from the United States that wish to permanently enter Mexican territory.

The basic structure of an NMX or NOM standard is as follows:

• - Presentation: the identification number and title, the secretariat or agency that issues it and the legal bases are indicated.

• - Considering: the spirit or need that led to its creation is indicated.

• - Preface: the standard and the organizations involved in its creation are presented.

• - Index of content by titles: the parts that make it up are indicated, generally the following:

• Objective and field of application: indicates the limits of the application of the specific standard, the matters covered and not covered by the standard are indicated, for example:

• References: the refereed technical texts that were used for its preparation are indicated.

• Specifications: specific tables or data.

• Guidelines: appropriate use and interpretation of the standard.

• Compliance: procedure by the user of the standard to verify compliance, which does not necessarily involve the verifier.

• Surveillance: indicates the authority in charge of monitoring the application and compliance and therefore responsible for the verifiers of its conformity.

• Concordance with international standards: indicates whether the standard has the appropriate characteristics to be considered consistent with another standard of foreign or national origin, either completely (common case when a foreign standard or norm is adopted) or only in part; It is also indicated whether or not it is consistent with something that at first appears to be so.

• - Bibliography: indicates the books refereed or that were taken into account in their preparation.

• - Transitory: since it is published in the Official Gazette of the Federation, it must contain at least three points:

• The time between its publication and its entry into force

• The matter it affects and the conditions under which it affects it, as it only applies to products made after the date of entry into force.

• The cancellation or replacement of a rule or law in force on the date of publication, which will remain in force until the date of entry into force of the rule.

Typically, a standard is in force for only five years; At least one year before, it must be indicated in the Official Gazette of the Federation that the standard is under review for its replacement, cancellation or endorsement. In any of the three cases, on dates prior to the end of the five-year validity period, the respective declaration must be issued in the Official Gazette of the Federation, with an extract thereof.

The so-called Emergency Standards") only have a maximum validity of twelve months, in two consecutive periods of six. These standards are used in urgent circumstances and, therefore, their issuance does not require the review procedure. If they are required for a longer period of time, a regular standard must be created with the entire subsequent procedure. These standards are identified by the fact that they include, in their title, the words "Emerging Standard" or some similar term and in their identification number, with the letter E in the specific type of standard. or by an EM between the type identifier and the standard number.[39][40][41]​.

• - Standards of the Ministry of Labor and Social Welfare "Annex: Official Mexican Standards of the Ministry of Labor and Social Welfare (Mexico)").

• - Explain the difference between law, regulation and NOM (in English).

• - Website of the Association for Standardization and Certification, A.C.

• - Website of the Mexican Institute of Standardization and Certification, A.C.

• - List of DGN NOM Standards Archived June 4, 2010 at the Wayback Machine.

• - List of NMX Standards of the DGN.

• - Official website of the Mexican Government for the dissemination of Mexican legislation.

• - Official website of the National Metrology Center.

• - Official website of the Mexican Accreditation Entity.

• - Differences between NOM and NMX.

Creating a standard

The general procedure for applying a standard begins with the creation or adoption of a standard for said product or service. CENAM has different committees for these standards. In the case of ISO, its standards may be mandatory by some international agreement, which had to be ratified by the Senate of the Republic like any international treaty. In the case of those issued by a regional or national official body of another country, such as the European Committee for Standardization of the European Union[10]​ or the ANSI of the United States, the standard only covers a recommendation character but its use may be required by lateral treaties such as a Free Trade Agreement. In the case of purely Mexican products or services, the standards issued by the technical committees of specialized civil organizations, such as the Tequila Regulatory Council, may be adopted.

These standards can be taken entirely from the source, although with their due translation into Spanish and their adaptation to the standard of Mexican regulations, but the legal rights for the use of the intellectual content must be obtained through CENAM or the DGN, which can be granted by previous international treaties, such as those corresponding to the general procedures for the evaluation of conformity issued by ISO and which in Mexico receive a double name. (NMX-CC-004:1995/IMNC-ISO-9002:1994. Quality Systems - Model for Quality Assurance in Production, Installation and Service.).[17]​[18]​[19]​.

In the case of similar standards such as, for example, NOM-001-SEDE and the NEC,[20]​ that deal with the use of electrical energy in low voltage. Through commercial exchange, technical committees create a national standard, adapting the general ideas of the foreign standard, which sometimes involves obtaining the rights to the foreign work. In the aforementioned case, the index of both works is very similar. Another is the case of the adoption or homogenization of a common standard, which involves an international treaty by which the technical part is left to only one country or to both countries, both countries being obliged to abide by it without modification. This can be seen in the list of products of Cables Monterrey"), today Viakon"),[21][22]​ whose products are standardized based on tests carried out abroad with a foreign standard, but endorsed, for their application in Mexico, by an international treaty.[23]​.

In all cases, draft standards must be issued, which are freely made known to the organizations interested in the matter, which can issue observations for their modification during a determined period of time[24]​.

nsayos%2FListas_Verificacion]</ref> which indicates the steps that the UV must follow to issue a certificate of compliance or conformity with the standard to the natural or legal person who requests it (usually called client), or, where appropriate, issue one or more documents of non-compliance or non-conformity, which can be saved with subsequent verification procedures where the client must demonstrate that it complies with the standard and must be granted the certificate of conformity. If for some reason the verifier does not want to issue the certificate, the client may complain to the body that endorses the verifier, obliged to review the procedure, after which it can obli=blogcategory&id=179&Itemid=217]</ref>[25]​[26]​.

Verification of evidence

Procedures for compliance with a standard are rarely based on qualitative parameters, and the procedures and test results usually requested in standards are quantitative. Therefore, the tests must be carried out in testing laboratories or in the field with measurement devices endorsed by CENAM, either directly or through accredited laboratories or organizations (such as the Federal Consumer Protection Agency (Profeco)[27]​[28]​ In the case of scales in public markets, the laboratory – which is almost always a legal entity –, after carrying out a calibration procedure for a client or verifier on its equipment, can issue a certificate. calibration of the equipment that indicates at least an official number, the calibration date and the validity of the calibration, after which the equipment must be recalibrated and the standard deviation that the device suffers with respect to the calibration standard, in addition to the characteristics that make that equipment unique, such as the equipment serial number, the model and the manufacturer.[29]​.

The calibration is done by comparing the equipment with national standard units), protected by Cenam and serve as a national standard for the calibration of the equipment of each accredited laboratory. For a calibration to be successful, the measurements of the calibrated equipment must be within a deviation range. If for some reason they are not, the equipment can be ordered to be repaired, but if its condition cannot be resolved, the device can be declared useless and a certificate is issued that disables it.

In any case, the measurements recorded on a paper signed by the person who took them and by the person responsible for the measurement carried out by the verifier himself, through the client or through a third party with calibrated equipment, must be accompanied by the official number of the calibration certificate, the dates of issue and validity, the model, the manufacturer and the serial number. In some cases, the measuring equipment can be manufactured with a calibration such that it is not considered necessary to send it to be calibrated, since, due to its characteristics, use and admissible deviation, it can be considered stable throughout its life, as long as it is not altered, as is usually the case with the flexometers that are used daily in construction and that carry the general trade number of calibration per batch, since they comply with a given standard that ensures this. This does not happen with wooden rulers for measuring fabrics, which must be calibrated.[29]​.

If a calibration certificate is issued, a label is attached to each piece of equipment indicating the official calibration number and validity, with the idea of ​​avoiding the application of the calibration certificate to uncalibrated equipment that is the same as even though it is calibrated.[30]​[31]​.

Verification costs

The cost of the services of a verifier as well as the certifying laboratory are regulated and standardized by the Ministry of Economy "Secretaría de Economía (Mexico)") or another appropriate agency, which may establish a single rate or depend on something, such as the number of pieces or the surface to be verified [32]​.

Contenido

Existen, según la Ley Federal sobre Metrología y Normalización, dos tipos de normas:.

Official Mexican Standard NOM

Thus, these standards are mandatory for those who fall within the scope of their application and when the activities or products are carried out during their validity. These standards are ordinarily published in their entirety in the Official Gazette of the Federation and are even published in electronic media, so they can be considered public access and free distribution, as long as they are not altered, although to refer to them those published by the Official Gazette of the Federation must be used.

Mexican Standard NMX

The Mexican standards, known by their acronym as NMX standards, created in Article 3 Section

Consequently, these are rules of non-obligatory use for those who fall within the scope of their application and when the activities or products are carried out during their validity. The application of this type of standards may be mandatory if it is referred to in a NOM to do something, as occurs in the case of NOM-002-SEDE-1999,[34]​ with respect to the standards NMX-J-116-ANCE and NMX-J-169-ANCE. These standards used to be published in full in the Official Gazette of the Federation and could even be obtained in electronic media since they were issued by public government entities, but recently the government has transferred responsibility to private organizations related to the matter such as, for example, the Association for Standardization and Certification, A.C.") (ANCE"))[35]​ or the IMCA, which license their use through a monetary payment or participation in its preparation, so they can be considered accessible. restricted and distribution denied to those who acquire it, when sold with a serial number, and is usually given with a license document for the exclusive use of the natural person.

Las normas se identifican por un título que indica su aplicación general y un número de identificación, formado por:[36]​[37]​.

• - Tres letras. El tipo específico de norma, NOM para las Normas Oficiales Mexicanas y NMX para las Normas Mexicanas. Cuando le antecede a estas letras una P (pe) o PROY el texto es solo un proyecto de norma y como tal no se puede usar, ya que podría modificarse, en caso de haber observaciones que se reúnan en el comité técnico que la elabora. La sigla EM indica un estado de emergencia y previene sobre los objetos o situaciones.

• - Tres dígitos. Es un código numérico específico de la norma, indicado por tres dígitos del 001 al 999, que es un número que siempre conserva la norma en sus diferentes versiones o refrendos. En ocasiones, una misma norma se emite en varias, ya que resulta más fácil actualizarla y revisarla; para indicarlo, se coloca una diagonal y un par de dígitos entre 01 y 99.

• - Tres o cuatro letras. Siglas de la secretaría de estado") o dependencia(-as) involucrada(-as) en el estudio, en la emisión y en la realización de los procedimientos de verificación, el cual se compone por tres o cuatro letras, según la secretaría en cuestión. Estas pueden variar entre revisiones, ya que la secretaría de estado") o dependencia puede crearse, modificar nombre u objetivos o desaparecer. Además, lleva un número al final de las letras, que indica el comité que las revisa, en algunas ocasiones lleva 1, 2 o 3, según el comité consultivo que las revisa.

• - Cuatro dígitos, que indican el año que se publicó en el Diario Oficial de la Federación. Esto suele confundirse con la entrada en vigor, pero por el tiempo de transición la entrada en vigor puede ser hasta el año siguiente de su publicación.

• - Organización: En las normas NMX, es usual colocar las siglas del organismo privado responsable de la norma, como puede ser la ANCE"). O entre el identificar de tipo NMX y el número de la norma se coloca una letra que indica el área técnica que realizó la norma.

Examples of standards

• - NOM-018-STPS-200")0: Official Mexican Standard 018 of the Ministry of Labor and Social Welfare "Secretaría del Trabajo y Previsión Social (Mexico)") (STPS "Secretaría del Trabajo y Previsión Social (Mexico)"), which came into force in 2000. It describes the system for the identification and communication of hazards and risks regarding dangerous chemical substances in the workplace.

• - NOM-003-CNA-1996: Mexican Official Standard number 003 of the National Water Commission (CONAGUA), which came into force in 1996. It stipulates the requirements for the construction of water extraction wells "to prevent contamination of aquifers").

• - NOM-251-SSA1-2009:[38]​ Hygiene practices for the processing of food, beverages or food supplements. This standard cancels the official Mexican standards NOM-120-SSA1-1994, Goods and services. Hygiene and health practices for the processing of food, non-alcoholic and alcoholic beverages, and NOM-093-SSA1-1994, Goods and Services. Hygiene and health practices in the preparation of food offered in fixed establishments, published in the Official Gazette of the Federation on August 28, 1995 and October 4, 1995, respectively.).

• - NOM-003 SEGOB/2002: Describes Signs and notices for Civil Protection; including colors, shapes and symbols to use.

• - NMX-TT-002-1997-IMNC: Minimum quality requirements for institutions that offer training plans and programs for tourism and work in that area.

• - NMX-AA-127-SCFI-2006: Potabilization of water for use and human consumption: sodium polyphosphate. Specifications and test methods*.

• - NMX-J-010-1996-ANCE: Electrical-conductive products with thermoplastic insulation") based on polyvinyl chloride, for installations up to 600 V. Specifications. (This standard cancels the previous one, NMX-J-010-1993-SCFI.).

• - NMX-F-605-2004-NORMEX; Hygienic handling in the service of prepared foods to obtain the H Distinction.

• - PROY-NOM-157-SEMARNAT-2009: Draft Official Mexican Standard that establishes the elements and procedures to implement mining waste management plans. (Official Gazette of the Federation, December 4, 2009.

• - PROY-NOM-SSA2-043-2002: Draft Official Mexican Standard, basic health services. Promotion and education for health in food matters. Criteria to provide guidance.

• - NOM-EM-158-SEMARNAT-2009: Official Mexican Emergency Standard, which health regulates the import of natural Christmas trees of the species of the Pinus and Abies genera, and the species Pseudotsuga menziesii, to prevent the entry into the country of the following pests associated with them: Vespula germanica, Choristoneura fumiferana, Choristoneura occidentalis, Deroceras reticulatum, Diprion similis"), Orgya pseudotsugata"), Paradiplosis tumifex"), Grovesiella abieticola"), Rhabdocline weirii"), Nalepella ednae"), Epitrimerus pseudotsugae") and Phomopsis lokoyae").

• - NOM-EM-010-SCFI-2003: Emerging Standard for Trailers and Semi-trailers – Safety Elements for new and used units coming mainly from the United States that wish to permanently enter Mexican territory.

The basic structure of an NMX or NOM standard is as follows:

• - Presentation: the identification number and title, the secretariat or agency that issues it and the legal bases are indicated.

• - Considering: the spirit or need that led to its creation is indicated.

• - Preface: the standard and the organizations involved in its creation are presented.

• - Index of content by titles: the parts that make it up are indicated, generally the following:

• Objective and field of application: indicates the limits of the application of the specific standard, the matters covered and not covered by the standard are indicated, for example:

• References: the refereed technical texts that were used for its preparation are indicated.

• Specifications: specific tables or data.

• Guidelines: appropriate use and interpretation of the standard.

• Compliance: procedure by the user of the standard to verify compliance, which does not necessarily involve the verifier.

• Surveillance: indicates the authority in charge of monitoring the application and compliance and therefore responsible for the verifiers of its conformity.

• Concordance with international standards: indicates whether the standard has the appropriate characteristics to be considered consistent with another standard of foreign or national origin, either completely (common case when a foreign standard or norm is adopted) or only in part; It is also indicated whether or not it is consistent with something that at first appears to be so.

• - Bibliography: indicates the books refereed or that were taken into account in their preparation.

• - Transitory: since it is published in the Official Gazette of the Federation, it must contain at least three points:

• The time between its publication and its entry into force

• The matter it affects and the conditions under which it affects it, as it only applies to products made after the date of entry into force.

• The cancellation or replacement of a rule or law in force on the date of publication, which will remain in force until the date of entry into force of the rule.

Typically, a standard is in force for only five years; At least one year before, it must be indicated in the Official Gazette of the Federation that the standard is under review for its replacement, cancellation or endorsement. In any of the three cases, on dates prior to the end of the five-year validity period, the respective declaration must be issued in the Official Gazette of the Federation, with an extract thereof.

The so-called Emergency Standards") only have a maximum validity of twelve months, in two consecutive periods of six. These standards are used in urgent circumstances and, therefore, their issuance does not require the review procedure. If they are required for a longer period of time, a regular standard must be created with the entire subsequent procedure. These standards are identified by the fact that they include, in their title, the words "Emerging Standard" or some similar term and in their identification number, with the letter E in the specific type of standard. or by an EM between the type identifier and the standard number.[39][40][41]​.

• - Standards of the Ministry of Labor and Social Welfare "Annex: Official Mexican Standards of the Ministry of Labor and Social Welfare (Mexico)").

• - Explain the difference between law, regulation and NOM (in English).

• - Website of the Association for Standardization and Certification, A.C.

• - Website of the Mexican Institute of Standardization and Certification, A.C.

• - List of DGN NOM Standards Archived June 4, 2010 at the Wayback Machine.

• - List of NMX Standards of the DGN.

• - Official website of the Mexican Government for the dissemination of Mexican legislation.

• - Official website of the National Metrology Center.

• - Official website of the Mexican Accreditation Entity.

• - Differences between NOM and NMX.