UL 1310 is a safety standard specifically developed for Class 2 power units, which are power supplies with limited energy output to reduce the risk of electric shock or fire. This standard is part of the broader set of UL safety standards and is essential for manufacturers and designers of low-voltage electrical equipment, particularly those used in residential, commercial, and industrial applications.

Scope and Application

UL 1310 applies to Class 2 power units that are intended to be used in dry or damp locations and are not subjected to mechanical damage. These power units are commonly used in applications such as:

    - LED lighting systems

    - Security systems

    - Thermostats and HVAC controls

    - Low-voltage landscape lighting

    - Battery chargers for small electronic devices

The standard covers both AC and DC power units, including those with provisions for battery charging, and applies to power units with output voltages not exceeding 30V for AC or 42.4V peak for DC.

Key Safety Requirements

UL 1310 establishes safety requirements to address risks associated with electrical, fire, and mechanical hazards. Some of the key safety requirements include:

    Electrical Safety: The standard specifies requirements for insulation, grounding, and protection against electric shock. It includes guidelines for minimum spacing between live parts, protection against short circuits, and the use of overcurrent protection devices.

    Fire Safety: UL 1310 includes requirements for the flammability and fire resistance of materials used in Class 2 power units. It also addresses measures to prevent the spread of fire within and from the equipment.

    Mechanical Safety: The standard sets forth requirements to prevent mechanical hazards such as sharp edges, moving parts, and stability issues that could lead to injury or equipment damage.

    Performance and Reliability: UL 1310 specifies performance criteria for Class 2 power units to ensure their reliable operation under normal and abnormal conditions. This includes requirements for temperature limits, output voltage regulation, and endurance testing.

    Marking and Labeling: The standard requires clear and durable marking on Class 2 power units, including information about electrical ratings, manufacturer identification, and safety warnings.

Testing and Certification

To demonstrate compliance with UL 1310, manufacturers submit their Class 2 power units for testing and evaluation by a recognized testing laboratory, such as UL. The testing process involves a comprehensive assessment of the power unit's design, construction, and performance against the safety requirements outlined in the standard.

Upon successful completion of the testing, the power unit is certified and may carry the UL mark, indicating its compliance with UL 1310. This certification is often a prerequisite for selling Class 2 power units in North America and can facilitate market access in other regions that recognize UL standards.

Harmonization and Global Acceptance

While UL 1310 is a North American standard, it is harmonized with international standards such as IEC 61347-2-13 for low-voltage lighting control gear. This harmonization helps manufacturers design products that meet safety requirements across different markets, simplifying the global distribution of Class 2 power units.

UL 1310 plays a crucial role in ensuring the safety and reliability of Class 2 power units, which are widely used in various low-voltage applications. By setting stringent safety requirements and providing a framework for testing and certification, UL 1310 helps protect consumers and property from potential hazards associated with these power units.

Types of Power Supply

- ATX (Advanced Technology eXtended)
- CFX (Compact Form Factor)
- EPS (Entry-Level Power Supply)
- IEC standards for power supplies
- Power supply efficiency standards
- SFX (Small Form Factor)
- TFX (Thin Form Factor)
- UL standards to power supplies

++ Power Supply Homepage 

----------