For companies that reference dozens of UL standards, a subscription through UL’s Collaborative Standards Development System (CSDS) or third-party providers like IHS Markit (now part of S&P Global) offers access to UL 2166 as part of a larger package. Costs vary but start around $2,000/year for a small team.
The National Fire Protection Association (NFPA) updated NFPA 652 in 2024 (current cycle). Chapter 8 directly requires that for North American installations. ul 2166 pdf
This article provides a deep dive into what UL 2166 entails, why it is vital for modern infrastructure, and how to correctly access the documentation you need without violating copyright or risking the use of outdated information. For companies that reference dozens of UL standards,