Introduction to Mexico's NOM certification:

         (Normas Oficiales Mexicanas) is a mandatory safety mark in Mexico to indicate that the product complies with the relevant NOM standards. The NOM mark applies to most products, including telecommunications and information technology equipment, household electrical appliances, lamps and other products that are potentially hazardous to health and safety. Whether locally manufactured or imported products in Mexico, they must comply with relevant NOM standards and product labeling regulations. At present, there are two issuing units for the safety certification of electrical products in Mexico, namely NYCE and ANCE.
  NYCE: The scope of certification includes all electronic and information products and data processing equipment, but does not include household appliances (except microwave ovens)
  ANCE: The scope of certification includes all electrical appliances and similar products (such as home appliances).
  The validity period of the certificate is one year, and the certificate can be renewed every year. When renewing the certificate, it is necessary to randomly sample a product from the market in advance so that it can be sent to the laboratory for testing without factory inspection.