NOM is Mexico's mandatory standard — Normas Oficiales Mexicanas, the Mexican Official Standards. Any electrical or electronic product entering Mexican customs for distribution is legally required to have it. Without the NOM mark, goods can be detained, fined or even banned. The local voltage is 127 volts, 60 hertz, and the plug matches the US type.
The certificate holder must be a Mexican local entity — an importer, authorised agent or subsidiary. A Chinese factory cannot hold the certificate directly; that is a hard threshold. Finding a local agent is step one, because every later document hangs under its name and it carries the liability. The Mexican tax ID, the RFC, is a registration prerequisite; without a valid RFC the agent cannot even get the certificate application through. So when choosing an agent, do not judge only by the quote — first verify its qualifications and customs-clearance record, or you will stall on the tax ID later.
Information-technology and data-processing equipment follow NOM-019-SCFI; household appliances follow NOM-001-SCFI, while audio-video, lamps, toys and external power supplies follow NOM-003-SCFI. Wireless-bearing products additionally stack NOM-208-SCFI-2016 (cellular terminals follow NOM-221) and require a separate IFT radio registration.
Get the standard wrong and all later testing is wasted, so classifying before sampling saves time over blind testing. The report version must match the current local edition; substituting another country's old version will not be accepted.
Confirm the product category and applicable clauses before talking about samples. For low-voltage products at 24 volts and below, the old industry read was voluntary, but the current NOM-001-SCFI-2018 has brought 24 V and below (including pure battery supply) into the mandatory scope. Whether under-24 V is exempt follows the current Mexican mandatory list and the certifying body's confirmation — do not blanket-treat it as voluntary. Wireless adds the IFT registration and must not be conflated.
A CB test report plus certificate dramatically shortens the cycle; without it, testing runs fresh under NOM. The product manual, design drawings, specification, circuit diagram and key-component list must all be complete, and key safety components need compliance reports — missing a page can affect review.
The Spanish-language label and Spanish user manual are mandatory; an English version cannot substitute. The nameplate must carry product name, model, manufacturer and the NOM mark; wrong label content gets bounced back for revision.
Entity and authorisation documents: the Mexican importer's name, address, tax ID and business registration certificate form the holder's qualification base. The manufacturer's authorisation letter must be stamped, delegating the Mexican party to hold the certificate and handle spot checks and customs. The power of attorney must be a Spanish original clearly stating the agent's authority to apply, hold the certificate and meet market supervision. A cooperation agreement notes the model authorisation scope and liability split, avoiding later disputes.
Usually one to three samples, by product. Some categories need a material-safety statement and risk assessment, especially on electric-shock prevention, with supply parameters matching the Mexican standard. Samples go with full accessories and packaging; some laboratories check whether the packaging marking is compliant too, and sending bare units then fixing the label later is a nuisance.
For Mexico NOM, the product category and whether IFT is needed are confirmed with the client first, avoiding the worst rework: submitting documents only to find the radio registration missing and redoing the whole path.
For those doing North-American UL or CSA alongside NOM, BlueAsia's one-stop testing and certification reuses the safety reports across the arrangement, one test serving multiple countries with a single schedule.
The most frequent documentation problem is incomplete Spanish files — a manual or label mixing in English gets rejected outright, and redoing the Spanish costs another round; many factories stumble here.
A tax-ID or authorisation mismatch calls the holder's qualifications into question, stalls the certificate, and throws the clearance plan into disarray — the loss exceeds the certification fee, and the timeline goes with it.
Contact: King Email: king.guo@cblueasia.comAddress: Building C, Hongjingda Industrial Park, No. 107 Beihuan Road, Shiyan Street, Bao'an District, Shenzhen, China BlueAsia delivers more than service!
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