EN 60335-2-40: Safety of Household and Similar Electrical Appliances
1. Principles and Scope
1.1 Description and Field of Application
EN 60335-2-40 establishes particular safety requirements for household and similar electrical appliances of the type heat pump, air conditioner, and dehumidifier. This standard applies to appliances operating with electrical supply up to 250V single-phase or 480V three-phase.
The standard covers specific risks associated with these appliances, including:
- Protection against electric shock
- Prevention of mechanical hazards
- Limitation of overheating
- Fire prevention
- Management of refrigerant leakage risks
1.2 Comparisons with Related Standards
| Standard | Field | Relationship |
|---|---|---|
| IEC 60335-1 | General requirements | General standard that EN 60335-2-40 specifies for heat pumps |
| EN 378 | Refrigeration systems | Complements EN 60335-2-40 on refrigeration circuit safety aspects |
| UL 484 | North American standard | American equivalent for air conditioners |
| ISO 5149 | Refrigeration systems | International standard complementing requirements for refrigeration systems |
2. Role and Importance
2.1 Primary Objective
EN 60335-2-40 ensures the safety of users and the environment during the use of electrical heating and cooling appliances. This standard establishes technical criteria for verifying that household appliances do not present hazards to human health and safety.
2.2 Quality Control and Compliance
Manufacturers must demonstrate compliance through:
- Design and prototype testing
- Periodic production testing
- Electrical safety condition verification
- Refrigerant charge monitoring
- Leak detection system assessments
2.3 Limitations and Scope
EN 60335-2-40 does not cover:
- Complex centralized commercial air-conditioning systems
- Specific small portable appliances
- Permanent professional installations
Important Note: The 6th edition (2022) introduced major changes for flammable refrigerants, including stricter charge limits and mandatory automatic leak detection systems.
3. Procedures and Technical Requirements
3.1 Protection Against Electric Shock
Appliances must meet the following requirements:
- Appropriate grounding and continuity of protective conductors
- Double or reinforced insulation according to configurations
- Minimum insulation resistance compliant with standard values
- Residual current protection devices (RCD) where applicable
3.2 Limitation of Thermal Overload
Appliances must be equipped with thermal protection systems:
- Temperature regulation thermostat
- Thermal overload sensors
- Automatic cutoff devices when limits are exceeded
- Testing under extreme operating conditions
3.3 Management of Flammable Refrigerants
For flammable refrigerants (R32, R290):
- Maximum charge limit defined in the circuit
- Mandatory leak detection systems
- Visible and durable hazard labeling
- Technical documentation and installation instructions provided
- Specific safety testing for leak scenarios
3.4 Prevention of Mechanical Hazards
Protection against:
- Access to dangerous moving parts
- Involuntary release of components
- Sharp edges or hot surfaces
4. Regulatory Framework and Applications
4.1 Regulatory References
EN 60335-2-40 is directly related to:
- Machinery Directive 2006/42/CE: Appliances must comply for European market placement
- Low Voltage Directive 2014/35/UE: Mandatory electrical compliance
- Ecodesign Directive 2009/125/CE: Energy efficiency requirements
- CE Marking: Declaration of conformity required
4.2 Sectoral Applications
Residential
Air-to-air and air-to-water heat pumps for heating and cooling individual and multi-family residences. Multiple split systems for climate comfort.
Light Commercial
Office air conditioners, small stores, and technical spaces. Dehumidifiers for warehouses and storage areas.
Specialized Installations
Multi-split systems for complex buildings. Heat pumps for light industrial applications within standard limits.
5. Best Practices
5.1 For Manufacturers
- Integrate EN 60335-2-40 requirements from initial design phase
- Implement robust quality assurance system
- Conduct comprehensive testing before market release
- Maintain complete and updated technical documentation
- Monitor new requirements related to environmentally-friendly refrigerants
- Train staff on specific risks of flammable refrigerants
5.2 For Installers and Users
- Verify CE declaration of conformity before installation
- Strictly follow manufacturer's installation instructions
- Ensure proper grounding and adequate electrical protection
- Perform regular maintenance and leak verification
- Record maintenance interventions in maintenance log
- Use only qualified technicians for refrigerant operations