All electrical products exported into Mexico must meet NOM (Norma Oficial Mexicana) requirements, which are a set of regulations and standards that are required by the Mexican government, as well as mandatory energy efficiency requirements.
Products requiring NOM Certification include:

• Household refrigerators.
• Freezers.
• Gas heaters.
• Cloth washers.
• Air conditioners.
• Small induction motors and motor operated tools.
• Vertical and submersible water pumps.
• Compact fluorescent lamps and wiring devices.
• Telecom products that are data transmitters (digital, analogical, LAN or WAN systems) and those intended to be connected to the Public Telecom Network (PTN) and designed to process, receive, transmit or convert signals.

A NOM certification is only granted by the Mexican government to manufacturers, importers and sellers from countries that the government has a free trade treaty or an agreement regarding trade. First-time applicants must provide two original service agreement copies that have been signed on each page and section. A notification outlining any non-compliancy issues or deficiencies that are found will be sent, and these issues must be appropriately addressed before the certification process can restart once again. Once the product is tested and found to be in compliance with the applicable NOM requirements, a certificate is issued in favor of your Mexican representative, and the product can be marked with the NOM Mark.
Under Mexican law, the NOM certificate holder, is responsible for warranty, maintenance and product liability. NOM certificates are non-transferable. However, a manufacturer that is a NOM holder may extend usage rights of its NOM certification to Mexican distributors, who may then obtain their own NOM certification without additional testing.