Regulations on the Use of Low-Voltage Distribution Boxes in Mexico

Low-voltage distribution boxes in Mexico must comply with NOM-003-SCFI-2014 and NOM-001-SEDE-2012, ensuring safety, proper installation, and certification for voltages up to 1,000 V AC and 1,500 V DC.

Applicable Standards

NOM-003-SCFI-2014 establishes safety requirements for electrical equipment, including low-voltage distribution boxes, to protect users from electrical shock, fire hazards, and other risks. It applies to devices using public service electricity, batteries, accumulators, or self-generation systems, covering both AC (up to 1,000 volts) and DC (up to 1,500 volts) applications . NOM-001-SEDE-2012 regulates the safety and efficiency of electrical installations, including grounding, bonding, and proper wiring practices for low-voltage systems . Compliance ensures that distribution boxes are installed according to safe design and operational standards.

Certification and Compliance

Low-voltage distribution boxes must be certified by an accredited Certification Body (CB) before being sold or installed in Mexico. The certification process involves testing for electrical safety, proper labeling, and adherence to applicable NOMs . Products must display the NOM mark according to NOM-106-SCFI-2017, which specifies label design, placement, and visibility . Importers, manufacturers, or distributors are responsible for ensuring compliance. This includes submitting samples, technical documentation, and test results to the CB, and maintaining records for inspection by authorities .

Installation and Safety Requirements

• Voltage limits: Distribution boxes must be rated for the intended AC or DC voltage, not exceeding 1,000 V AC or 1,500 V DC .
• Grounding and bonding: Proper grounding is mandatory to prevent electrical hazards, as specified in NOM-001-SEDE-2012 .
• User information: Clear instructions and labeling must be provided to guide safe use and maintenance .
• Compliance with international standards: Many NOMs reference IEC standards (e.g., IEC 60335-1, IEC 60598-1) for design and testing, ensuring global safety alignment .

Regulatory Authorities

The Secretaría de Energía (SENER) and Comisión Federal de Electricidad (CFE) oversee electrical safety regulations, while the Secretaría de Economía (SE), through the Dirección General de Normas (DGN), manages NOM development and enforcement .

Key Considerations

• Always verify which NOMs apply to your specific distribution box model.
• Ensure certification is obtained from an accredited CB before import or installation.
• Maintain proper documentation and labeling to comply with Mexican law.
• Stay updated on changes to NOMs and related standards to avoid fines or safety violations . By adhering to these regulations, low-voltage distribution boxes can be safely installed and legally marketed in Mexico, protecting both users and operators from electrical hazards.