NOM-010-SESH-2012 is an Official Mexican Standard that establishes safety requirements and test methods for domestic appliances for cooking food fueled by liquefied petroleum gas (LPG) or natural gas, intended for residential use in Mexico. Issued by the Secretaría de Energía (Secretaría de Energía, formerly SESH) with support from the Secretaría de Economía, it was published in the Official Gazette of the Federation (Diario Oficial de la Federación) on August 10, 2012, and became effective on February 10, 2013, replacing NOM-010-SESH-2002. The standard aims to ensure consumer safety by mitigating risks such as gas leaks, carbon monoxide poisoning, burns, and explosions, while promoting reliable performance of these appliances.
Scope and Applicability:
The standard applies to new domestic appliances for cooking food in households,powered by:
- Liquefied petroleum gas (LPG).
- Natural gas.
Covered products include:
- Storage water heaters (tank-type, with capacities typically up to 100 liters).
- Instantaneous (tankless) water heaters.
Exclusions:
- Industrial or commercial
- Electric or solar
- Heaters using fuels other than LPG or natural gas (e.g., diesel, wood). It applies to products manufactured, imported, or sold in Mexico, focusing on design, construction, and operational safety.
NOM-010-SESH-2012
Key Requirements:
1. Safety Specifications:
- Gas Tightness: Must prevent gas leaks at connections, valves, and burners under normal and overpressure conditions.
- Combustion Safety: Must ensure complete combustion to minimize carbon monoxide (CO) emissions, with CO levels not exceeding specified limits (e.g.,≤0.04% in flue gases).
- Overheat Protection: Must include devices (e.g., thermocouples, thermostats) to shut off gas flow if temperatures exceed safe thresholds.
- Flame Stability: Burners must maintain stable flames to prevent flashback or extinction.
- Pressure Regulation: Must incorporate mechanisms to handle gas pressure variations (e.g., 2.74 kPa for LPG, 1.74 kPa for natural gas).
- Explosion Prevention: Design must avoid ignition risks from gas accumulation.
2. Performance Requirements:
- Thermal Efficiency: Must achieve a minimum efficiency (e.g., ≥75% for storage heaters, ≥80% for instantaneous) to optimize fuel use.
- Water Temperature Control: Must deliver water within safe temperature ranges (e.g., ≤60°C to prevent scalding unless adjustable).
- Durability: Materials (e.g., steel tanks, copper tubing) must resist corrosion and withstand repeated heating cycles.
3. Test Methods:
- Based on Mexican standards (e.g., NMX-X series) and aligned with international norms like ANSI Z21.10.1 (gas water heaters), adapted for Mexico’s gas supply conditions.
Tests include:
- Gas leakage under static and dynamic pressures.
- CO emission measurement in controlled combustion.
- Thermal efficiency calculation (energy output vs. fuel input).
- Overheat and flame failure response (e.g., thermocouple cutoff time).
- Endurance cycling (e.g., 10,000 ignition cycles).
- Temperature and pressure stress tests.
4. Labeling:
- Labels must include:
- Manufacturer or importer name and address.
- Model and type (e.g., “LPG Storage Heater, 40 L”).
- Fuel type (LPG or natural gas).
- Nominal gas consumption (e.g., kg/h for LPG, m3/h for natural gas).
- Thermal capacity (e.g., kW).
- Safety warnings (e.g., “Install in well-ventilated area,” “Do not modify burner”).
- Country of origin (e.g., “Hecho en México”).
- Information must be in Spanish, legible, and affixed to the heater or packaging.
- Compliance with NOM-010-SESH-2012 must be indicated.
5. Compliance:
- Manufacturers or importers must obtain a Certificate of Conformity from accredited certification bodies (e.g., NYCE, ANCE) through testing by approved laboratories.
- Certification may involve factory inspections to verify production consistency.
- Certificates are typically valid for 1-3 years, with surveillance audits.
- Mandatory for legal sale or import.
Purpose and Enforcement:
NOM-010-SESH-2012 ensures the safe operation of Domestic appliances for cooking food that uses Natural or LP Gas, critical in Mexican households where LPG is widely used (over 80% of homes). It addresses risks from improper combustion or installation, which can lead to CO poisoning or fires, while promoting fuel efficiency. Enforcement is managed by:
- Secretaría de Energía for technical oversight.
- PROFECO (Federal Consumer Protection Agency) for market inspections and labeling compliance.
- Customs authorities for import verification.
Non-compliance—such as failing CO tests or lacking safety devices—can result in fines, product seizures, or sales bans.