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.
Nina She