Let’s open the hood. If you download the PDF (purchase it legitimately from UL’s shop), here are the specific clauses that are causing the most heat.
For the first time in years, the rules for determining the Short-Circuit Current Rating of a panel have changed significantly. Panels that previously passed muster may now require additional current-limiting devices. This has engineers scrambling to re-run calculations and update nameplates. ul 508a 2022 pdf hot
Because "hot" can also mean "stolen," let’s clarify where to actually get this document legally. Let’s open the hood
Do not trust free PDFs from random websites. They are often the 2013 edition with a renamed file, or worse, riddled with malware. Do not trust free PDFs from random websites