What is UL 60947-3:2020?

Introduction

UL 60947-3:2020 is a technical standard that pertains to low-voltage switchgear and controlgear. It specifies requirements for switches, disconnectors, circuit-breakers, and similar devices intended to protect electrical circuits against overloads, short circuits, and other abnormal conditions.

Scope and Application

The standard applies to equipment with rated operating voltages up to 1000 volts AC or 1500 volts DC. It ensures that the equipment meets certain safety requirements and can withstand specified electrical and mechanical stresses. UL 60947-3:2020 is applicable to various industries, including residential, commercial, industrial, and more.

Key Requirements

UL 60947-3:2020 outlines key requirements for low-voltage switchgear and controlgear. These include:

Rated operational voltage: The standard specifies the maximum voltage level at which the equipment can operate reliably and safely.

Clearance and creepage distances: This requirement ensures that there is adequate space between conductive parts to prevent electrical arcing or short circuits.

Temperature rise limits: The standard defines temperature limits for the equipment during normal operation to ensure it does not overheat.

Protection against electric shock: UL 60947-3:2020 includes measures to protect users from direct or indirect contact with live parts.

Short-circuit protection: The standard specifies the equipment's ability to handle and interrupt fault currents within defined limits.

Marking and documentation: UL 60947-3:2020 requires clear and proper marking on the equipment to indicate its specifications, manufacturer details, and more.

Compliance and Certification

Manufacturers must ensure that their low-voltage switchgear and controlgear comply with UL 60947-3:2020 in order to attain certification. Compliance involves thorough testing and evaluation of the equipment to ensure it meets all the required safety measures outlined in the standard. Once certified, the manufacturers can display the appropriate UL certification mark, indicating that their product adheres to the highest safety standards.

Conclusion

UL 60947-3:2020 plays a vital role in ensuring the safety and performance of low-voltage switchgear and controlgear. By following its guidelines, manufacturers can produce reliable and durable electrical equipment that protects against overloads, short circuits, and other abnormal conditions. Compliance with this standard provides reassurance to users and enhances overall electrical safety in various industries.