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What is UL 1642-2020 ?

Title: What is UL 1642-2020? A Technical Standard for Safety Science

The safety of products is of utmost importance in today's world. This is where UL (Underwriters Laboratories) comes in, a globally recognized independent safety science company that tests and certifies products for their safety and reliability. Recently, UL has released the updated version of UL 1699, which is an important technical standard in the electrical industry. In this article, we will provide an easy-to-understand explanation of UL 1699:2020 and its significance.

Purpose of UL 1699:2020:

UL 1699:2020 is a technical standard developed by UL to set the requirements for arc-fault circuit interrupters (AFCIs), also known as arc fault detectors, which are devices used in electrical systems to protect against dangerous arcs and fires caused by electrical faults. The standard specifies the performance, testing, and marking requirements for AFCIs to ensure their effectiveness in preventing electrical fires.

Key Changes in UL 1699:2020:

UL 1699:2020 includes several key changes compared to the previous version. One of the most significant changes is the of new requirements for the performance of AFCIs. The standard specifies more detailed testing procedures for AFCIs, including tests for detecting faults in different types of electrical installations.

Another significant change in UL 1699:2020 is the of new requirements for the marking of AFCIs. The standard specifies the use of new marking techniques to better communicate the capabilities of AFCIs to users.


UL 1699:2020 is an important technical standard that sets the requirements for AFCIs in the electrical industry. The standard's of new requirements for performance and marking of AFCIs has the potential to significantly improve the safety of electrical systems. As the demand for safe and reliable products continues to grow, UL's development of UL 1699:2020 is a step in the right direction towards ensuring the safety of the products we use every day.


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