G/TBT/N/MEX/374  
28 September 2017  
(17-5172) Page: 1/3 
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:  
Comisión Reguladora de Energía  
Blvd. Adolfo López Mateos 172, Merced Gómez  
Ciudad de México C.P. 03930  
Tel.: 5283 1500 or 5283 1515  
Email: calidad@cre.gob.mx  
3. Notified under Article 2.9.2 [ ], 2.10.1 [X], 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):  Metrological  
instruments used in electrical power measurement systems (IC S 91.140.50)  
5. Title, number of pages and language(s) of the notified document : Acuerdo por el 
que la Comisión Reguladora de Energía expide por segunda vez consecutiva La Norma 
Oficial Mexicana  de Emergencia NOM -EM-007-CRE-2017, Sistemas de medición  
de energía eléctrica . Especificaciones y métodos de prueba para medidores  
multifunción y transformadores de instrumento.  (Decision of the Energy Regulatory 
Commission issuing, for the second consec utive time, Emergency Mexican Official Standard 
NOM-EM-007-CRE-2017: Electrica l power measurement systems . Specifications and test 
methods for multifunction mete rs and instrument transformers ) (128 pages, in Spanish)  
6. Description of content : The notifi ed text establishes that, provided there is no definitive 
Mexican official standard on the matter, and given that the grounds for the publication of 
Emergency Mexican Official Standard NOM -EM-007-CRE-2017, "Electrical power 
measurement systems . Specificati ons and test methods for multifunction meters and 
instrument transformers" , remain applicable, the Commission considers it necessary to 
extend the validity of the Official Standard, since the Law on the Electricity Industry , the 
regulation thereto , the rules of the electricity market, manuals and other regulatory 
instruments already published or under development  require legal certainty of the 
measurement systems to be implemented , according to their  various classifications and 
functions.  
7. Objective and rationale, including the nature of urgent problems where 
applicable : The notified text states that the emergency conditions justifying the exercise 
of the authority conferred in Article 48 of the Federal Metrology and Standardization Law 
(LFMN), reflect the need to establish clear, effective and efficient rules and reliable, 
continuous and safe operation of the national electricity system, and the need to avoid the 
injury which could result from the absence of a Mexican official standard that sets out the  
definitions, characteristics, technical specifications and test methods, as well as the review, 
assurance and verification of measurement system elements.  G/TBT/N/MEX/374  
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  8. Relevant documents:  
 NOM-001-SEDE -2012, Instalaciones eléctricas (utilización)  (Mexic an Official 
Standard NOM -001-SEDE -2012: Electrical installations (use));  
 NMX-Z-12/1-1987, Muestreo para la inspección por atributos - Parte 1 : 
Información general y aplicaciones  (Mexican Standard NMX -Z-12/1-1987: 
Sampling for inspection by attributes . Part 1: General information and application);  
 NMX-J-109-ANCE -2010, Transformadores de corriente - especificaciones y 
métodos de prueba (Mexican Standard NMX -J-109-ANCE -2010: Current 
transforme rs - Specifications and test methods) (cancels Mexican Standard NMX -J-
109-1977);  
 NMX-J-550/4 -15-ANCE -2005, Compati bilidad electromagnética (EMC) - parte 4 -15: 
técnicas de prueba y medición - medidor de parpadeo - especificaciones de 
funcionamiento y diseño  (Mexican Standard NMX -J-550/4 -15-ANCE -2005: 
Electromagnetic compatibility (EMC) - Part 4 -15: Testing and measurement 
techniques - Flicker meter - Performance specifications and design);  
 NMX-J-610/4 -7-ANCE -2013, Compatibilidad electromagnética (EMC) - parte 4 -7: 
técnicas de prueba y medición - guía general de instru mentación y medición para 
armónicas e interarmónicas, en sistemas de suministro de energía eléctrica y 
equipo que se conecta a estos  (Mexican Standard NMX -J-610/4 -7-ANCE -2013: 
Electromagnetic compatibility (EMC) - Part 4 -7: Testing and measurement 
techniqu es - General guide on harmonics and interharmonics measurements a nd 
instrumentation, for power supply systems and equipment connected thereto) 
(cancels Mexican Standard NMX -J-550/4 -7-ANCE -2005);  
 NMX-J-610/4 -30-ANCE -2014, Compatibilidad electromagnética ( EMC) - parte 4 -30: 
técnicas de prueba y medición - métodos de medición y estudio de Calidad de la 
energía eléctrica (Mexican Standard NMX -J-610/4 -30-ANCE -2014: Electromagnetic 
compatibility (EMC) - Part 4 -30: Testing and measurement techniques - Methods 
to measure the quality of electrical power) (cancels Mexican Standard NMX -J-
610/4 -30-ANCE -2011);  
 NMX-J-615/1 -ANCE -2009, Transformadores de medida - parte 1 : requisitos 
generales (Mexican Standard NMX -J-615/1 -ANCE -2009: Measuring transformers - 
Part 1 : General requirements);  
 NMX-J-615/3 -ANCE -2013, Transformadores de medida - parte 3 : requisitos 
adicionales para transformadores de potencial inductivo  (Mexican Standard NMX -J-
615/3 -ANCE -2013: Measuring transformers - Part 3 : Additional requirements for 
inductive potential transformers);  
 NMX-J-615/5 -ANCE -2014, Transformadores de medida - parte 5 : requisitos 
adicionales para transformadores de potencial capacitivo (Mexican Standard NMX -
J-615/5 -ANCE -2014: Measuring transformers - Part 5 : Additional requirem ents for 
capacitive potential transformers);  
 NMX-J-674/22 -ANCE -2013, Equipo de medición de electricidad (C . A.) - requisitos 
particulares - parte 22 : medidores estáticos para energía activa  (clases 0.2 S y 0.5 
S) (Mexican Standard NMX -J-674/22 -ANCE -2013: Electricity metering equipment 
(AC) - Particular requirements - Part 22 : Static meters for active energy 
(clases  0.2 and 0.5)).  
9. Proposed date of adoption : 14 September 2 017 
Proposed date of entry into force : 14 September 2 017 
10. Final date for comment s: n/a G/TBT/N/MEX/374  
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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)  
Subsecretaría de Competitividad y Normatividad  
Dirección General de Normas  
Tel.: (+52) 55 5729 9100, Ext. 43217  
Fax: (+52) 55 5520 9715  
Website: http://www.economia -noms.gob.mx/?P=144  
Email: normasomc@economia.gob.mx  and/or sofia.pacheco@economia.gob.mx  
jose.ramosr@economia.gob.mx  
Text available online at:  
http://www.dof.gob.mx/nota_detalle.php?codigo=5498552&fecha=26/09/2017  
https://members.wto .org/crnattachments/2017/TBT/MEX/17_4339_00_s.pdf