What is UL 60947-2:2020?

UL 60947-2:2020 is a technical standard for low-voltage switchgear and control gear, published by Underwriters Laboratories (UL). This standard provides guidelines and requirements for the construction, performance, and testing of these electrical devices. It aims to ensure the safety and reliability of switchgear and control gear products used in various applications like industrial, commercial, and residential settings.

Scope and Application

The standard UL 60947-2:2020 covers a wide range of electrical equipment, including circuit-breakers, motor starters, contactors, terminal blocks, disconnect switches, and other similar devices. It provides specifications for products operating at rated voltages not exceeding 1000 V AC or 1500 V DC.

These guidelines are applicable to both original equipment manufacturers (OEMs) and end-users who install or operate such equipment. The standard outlines the specific requirements for the design, construction, and testing of these electrical devices to ensure their safe operation and protection against electrical hazards.

Main Requirements and Features

UL 60947-2:2020 lays down certain general rules that must be followed during the design and manufacture of low-voltage switchgear and control gear. Some key requirements covered by this standard include:

Durability and Resistance: The devices should be constructed using materials that can withstand mechanical stress, temperature variations, humidity, and chemical exposure.

Protection Against Electric Shock: The standard specifies measures for protecting users against electric shock, including insulation, grounding, and proper clearance distances.

Overload and Short-Circuit Protection: Switchgear and control gear devices must have appropriate protection mechanisms to prevent damage caused by overloads and short circuits.

Electromagnetic Compatibility: The devices should be designed to minimize electromagnetic interference (EMI) and ensure compatibility with other electrical systems.

Testing and Certification

UL 60947-2:2020 also outlines the necessary testing procedures for ensuring compliance with the standard's requirements. These tests are performed on representative samples and include functionality, performance, endurance, and environmental tests.

Manufacturers can submit their products for evaluation and certification by accredited testing laboratories. Once certified, the products can bear the UL Mark, indicating their compliance with all the applicable safety standards.

In conclusion, UL 60947-2:2020 plays a vital role in promoting the safety and reliability of low-voltage switchgear and control gear devices. Compliance with this standard ensures that these electrical devices meet stringent requirements for construction, performance, and testing, providing users with peace of mind and confidence in their operation.