What is UL 60947-9-2:2020?

UL 60947-9-2:2020 is a technical standard that focuses on low-voltage switchgear

and controlgear. It provides requirements for arc fault protection devices,

also known as AFDDs, which are designed to detect and mitigate the risks of

electrical fires caused by arcing faults in power distribution systems. This

article aims to provide a thorough understanding of UL 60947-9-2:2020, its key

requirements, and the importance of implementing this standard in electrical

installations.

The Purpose of UL 60947-9-2:2020

The primary objective of UL 60947-9-2:2020 is to enhance fire safety in

low-voltage switchgear and controlgear. Arcing faults can occur due to various

reasons such as loose connections, deteriorated insulation, or mechanical damage

to cables. These faults have the potential to result in devastating electrical

fires. UL 60947-9-2:2020 aims to address this concern by providing guidelines

for the design, testing, and performance of AFDDs used in electrical circuits.

AFDDs can identify the unique signatures of arcing faults and interrupt the

power supply to prevent fires from occurring.

Key Requirements of UL 60947-9-2:2020

UL 60947-9-2:2020 outlines specific requirements that AFDDs must meet to ensure

their effectiveness and reliability. These requirements include the ability to

detect different types of arcing faults, compatibility with various types of

electrical installations, and the capacity to withstand thermal and mechanical

stresses. The standard also provides guidelines for product marking,

documentation, and testing procedures. Compliance with these requirements is

crucial to ensure that AFDDs offer optimum protection against electrical fires

caused by arcing faults.

Implementing UL 60947-9-2:2020

Implementing UL 60947-9-2:2020 in electrical installations is important to

enhance fire safety measures. Electrical designers, installers, and maintenance

professionals should be aware of this standard and its requirements. Selecting

AFDDs that comply with UL 60947-9-2:2020 ensures that the installed devices are

capable of detecting and mitigating potential arcing faults. Regular inspection

and maintenance of AFDDs are also crucial to ensure their continued performance.

By incorporating this standard into electrical systems, the risk of electrical

fires can be significantly reduced, providing a safer environment for occupants

and preventing costly property damages.