What is UL 60947-2:2020?

The UL 60947-2:2020 is a technical standard that specifies requirements for low-voltage switchgear and controlgear assemblies. It focuses on the safety aspects of these electrical products and provides guidelines for their design, construction, testing, and performance.

Scope and Applicability

This standard applies to switchgear and controlgear assemblies intended for use in low-voltage circuits, with a rated voltage not exceeding 1000 V AC or 1500 V DC. It covers a wide range of applications, including residential, commercial, and industrial sectors where reliable power distribution and control are essential.

Key Requirements

The UL 60947-2:2020 sets out several key requirements that manufacturers must adhere to in order to ensure the safety and reliability of their switchgear and controlgear assemblies. These requirements include:

Temperature rise limits: The standard specifies maximum temperature rise limits for different components of the assemblies, ensuring that they operate within safe temperature ranges.

Clearances and creepage distances: To prevent electrical breakdown, the standard defines minimum clearance and creepage distance requirements between live parts and between live parts and accessible conductive parts.

Short-circuit withstand strength: Switchgear and controlgear assemblies must be able to withstand the thermal and dynamic effects of short-circuit currents, minimizing the risks of fire and equipment damage.

Pollution degree: Depending on the environment in which the assemblies will be used, the standard assigns a pollution degree that determines the level of external contamination they can withstand without compromising safety.

Testing and Certification

Prior to being marketed and sold, switchgear and controlgear assemblies must undergo rigorous testing to ensure compliance with the UL 60947-2:2020 standard. Manufacturers can obtain certification from recognized testing laboratories, providing assurance to customers that their products meet the required safety standards.

Conclusion

The UL 60947-2:2020 standard plays a crucial role in ensuring the safety and reliability of low-voltage switchgear and controlgear assemblies. By defining key requirements and conducting thorough testing, it helps protect against hazards such as electrical shock, fire, and equipment malfunction. Adherence to this standard not only benefits manufacturers by ensuring their products meet regulatory requirements, but also provides peace of mind to end-users who rely on these electrical products for their everyday operations.