G/TBT/N/MEX/447  
24 January 2019  
(19-0413) Page: 1/4 
Committee on Technical Barriers to Trade  Original:  Spanish  
 
  
NOTIFICATION  
The following notification is being circulated in accordance with Article 10.6.  
 
1. Notifying Member : MEXICO  
If applicable, name of local government involved (Articles 3.2 and 7.2):   
2. Agency responsible : Comisión Reguladora de Energía  (Energy Regulatory 
Commission)  
Name and address (including telephone and fax numbers, email and website 
addresses, if available) of agency or authority designated to handle comments 
regarding the notification shall be indicated if different from above:  
Comité Consultivo Nacional de Normalización Eléctrico  (National Advisory Committee on 
Standardization for Electricity), located at Boulevard Adolfo López Mateos 172, Colonia 
Merced Gómez, Alcaldía de Benito Juárez, Código postal 03930, Ciudad de México, Email: 
gcabr era@cre.gob.mx  and ccorrea@cre.gob.mx   
3. Notified under Article 2.9.2 [X], 2.10.1 [ ], 5.6.2 [ ], 5.7.1 [ ], other:  
4. Products covered (HS or CCCN where applicable, otherwise national tariff 
heading . ICS numbers may be provided in addition, where applicable) : Products 
related to power plants  
5. Title, number of pages and language(s) of the notified document : Proyecto de 
Norma Oficial Mexicana PROY -NOM-017-CRE-2018, Métodos de medición de variables 
para el cálculo del porcentaje de energía libre de combustible y procedimiento para la 
evaluación de la conformidad (Draft Mexican Official Standard PROY -NOM-017-CRE-2018: 
Methods for measuring variables to calculate percentages of fuel -free energy and 
conformity assessment procedure) (102 pages, in Spanish)  
6. Description of content : The notified draft Mexican Official Standard applies to power 
plants that need to obtain variable values for fuel -free energy (ELC) de terminations under 
the Efficiency and ELC Regulations when they use any of the following generation 
processes:  
(a) Power plants with efficient cogeneration processes  
(b) Clean power plants that use fossil fuels  
(c) Low emission technologies and thermal power plants using carbon capture and 
geological storage or sequestration  
(d) Power plants using hydrogen  
(e) Hydro -electric power plants  
The notified draft Mexican Official Standard will not apply to power plants that have a 
cogeneration permit and are ac credited as efficient cogeneration under the Law on the 
Public Electric Power Service, provided that their legacy interconnection contracts remain 
in effect.  G/TBT/N/MEX/447  
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  7. Objective and rationale, including the nature of urgent problems where 
applicable : The notified draft Mexican Official Standard seeks to establish:  
(a) the necessary metrology requirements and measurement methods that are to be 
employed by power plants needing to obtain variable values for use in ELC 
determinations;  
(b) the conformity assess ment procedure.  
8. Relevant documents:  
• Mexican Official Standard NOM -008-SCFI-2002: Sistema General de Unidades de 
Medida . 
• Mexican Official Standard NOM -013-SCFI-2004: Instrumentos de medición - 
Manómetros con elemento elástico -Especificaciones y métodos de prueba . 
• Mexican Official Standard NOM -086-SEMARNAT -SENER -SCFI-2005: Especificaciones 
de los combustibles fósiles para la protección ambiental . 
• Mexican Official Standard NOM -016-CRE-2016: Especificaciones de calidad de los 
petrolíferos . 
• Mexican Official Standard NOM -001-SECRE -2010: Especificaciones del gas natural 
(cancelling and replacing  NOM-001-SECRE -2003, Calidad del gas natural and NOM-
EM-002-SECRE -2009, Calidad del gas natural durante el periodo de emergencia 
severa ). 
• Mexican Standard NMX -AA-174-SCFI-2015, Que establece especificaciones y 
requisitos para la certificación de sustentabilidad ambiental en la producción de 
bioenergéticos líquidos de origen vegetal . 
• Mexican Standard NMX -EC-17025 -IMNC -2006: Requisitos generales para la 
competencia de los l aboratorios de ensayo y de calibración (cancelling NMX-EC-
17025 -IMNC -2000). 
• Mexican Standard NMX -AA-033-1985: Protección al Ambiente -Contaminación del 
Suelo - Residuos Sólidos Municipales -Determinación del Poder Calorífico Superior.  
• Mexican Standard NMX -B-030-1984: Industria Siderúrgica, Carbón y Coque . 
• Mexican Standard NMX -CH-003-1993: Instrumentos de medición - manómetros de 
presión, vacuómetros y manovacuómetros indicadores y registradores con 
elementos sensores elásticos (instrumentos ordinarios) . 
• IEC 6 0751:2008, Industrial platinum resistance thermometers and platinum 
temperature sensors.  
• ISO 6976:2016, Natural gas -- Calculation of calorific values, density, relative 
density and Wobbe indices from composition  
• ISO 2186:2007, Fluid flow in closed conduit s - Connections for pressure signal 
transmissions between primary and secondary elements.  
• ISO 5167 -1:2003, Measurement of fluid flow by means of pressure differential 
devices inserted in circular cross -section conduits running full - Part 1 : General 
princi ples and requirements  
• ISO 5167 -2:2003, Measurement of fluid flow by means of pressure differential 
devices inserted in circular cross -section conduits running full - Part 2 : Orifice plates  
• ISO 5167 -3:2003, Measurement of fluid flow by means of pressure differential 
devices inserted in circular cross -section conduits running full - Part 3 : Nozzles and 
Venturi nozzles.  
• ISO 5167 -4:2003, Measurement of fluid flow by means of pressure differential 
devices inserted in circular cross -section conduits running fu ll - Part 4 : Venturi tubes.  
• ISO 5167 -5:2016, Measurement of fluid flow by means of pressure differential 
devices inserted in circular cross -section conduits running full - Part 5 : Cone meters.  G/TBT/N/MEX/447  
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  • ISO/TR 9464:2008, Guidelines for the use of ISO 5167:2003.  
• ISO 6974-1:2012, Natural gas -- Determination of composition and associated 
uncertainty by gas chromatography -- Part 1 : General guidelines and calculation of 
composition.  
• ISO 6974 -2:2012, Natural gas -- Determination of composition and associated 
uncertainty by gas chromatography -- Part 2 : Uncertainty calculations.  
• ISO 6974 -3:2018, Natural gas -- Determination of composition and associated 
uncertainty by gas chromatography -- Part 3 : Precision and bias.  
• ISO 6974 -4:2000, Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ 
hydrocarbons for a laboratory and on -line measuring system using two columns.  
• ISO 6974 -5:2014, Isothermal method for nitrogen, carbon dioxide, C1 to C5 
hydrocarbons and C6+ hydrocarbons.  
• ISO 15970:2008, Natural gas - Measuremen t of properties - Volumetric properties : 
density, pressure, temperature and compression factor.  
• ISO 17090:2015 (Annex A), Health informatics - Public key infrastructure - Part 1 : 
Overview of digital certificate services.  
• ISO 9951:2007, Presentation/represe ntation of entries in dictionaries - 
Requirements, recommendations and information.  
• ISO 2715:2017, Liquid hydrocarbons - Volumetric measurement by turbine 
flowmeter  
• ISO 5725 -3:1994, Accuracy (trueness and precision) of measurement methods and 
results - Part 3 : Intermediate measures of the precision of a standard measurement 
method  
• ASME MFC -3M-2017, Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and 
Venturi.  
• ASME PTC 19.5 -2013, Flow Measurement - Performance Test Codes.  
• API MPMS 7, Manual of p etroleum measurement standards Chapter 7 - Temperature 
determination  
• API MPMS 14.3.2, Orifice Metering of Natural Gas and Other Related Hydrocarbon 
Fluids -Concentric, Square -edged Orifice Meters.  
• API MPMS 5.3 -2005, Manual of Petroleum Measurement Standards  Chapter 5 -
Metering Section 3 -Measurement of Liquid Hydrocarbons by Turbine Meters  
• API MPMS 5.2 -2005, Manual of Petroleum Measurement Standards Chapter 5 -
Metering Section 2 -Measurement of Liquid Hydrocarbons by Displacement Meters.  
• EC 60751:2008, Industria l platinum resistance thermometers and platinum 
temperature sensors.  
9. Proposed date of adoption : To be determined.  
Proposed date of entry into force : The notified draft Mexican Official Standard will 
enter into force 180 calendar days after the first calendar day following its publication in 
the Official Journal as a final standard.  
10. Final date for comments : 22 March 2 019 G/TBT/N/MEX/447  
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  11. Texts available from : National enquiry point [X] or address, telephone and fax 
numbers and email and website addresses, if available, of other body:  
Secretaría de Economía  (Ministry of the Economy)  
Dirección General de Normas  (Directorate -General of Standards)  
Tel.: (+52) 55 5729 9100, Ext. 43244  
Fax: (+52) 55 5520 9715  
Website : http://www.economia.gob.mx/comunidad -negocios/normalizacion/catalogo -
mexicano -de-normas  
Email:  
normasomc@economia.gob.mx /sofia.pacheco@economia.gob.mx /jose.ramosr@economi
a.gob.mx  
Text available at:  
http://www.dof.gob.mx/nota_detalle.php?codigo=5548498&fecha=21/01/2019  
https://members.wto.org/crnattachments/2019/TBT/MEX/19_0392_00_s.pdf