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This is arguably the most valuable part of the standard. Chapter SB (Supplementary Requirements) provides the methodology for calculating the SCCR of an entire panel. Since the 3rd Edition, the rules for determining SCCR have become more structured, allowing engineers to utilize specific current-limiting devices to achieve higher ratings without massive testing costs. If you need to achieve a 65kA or 100kA rating on a panel, this section is mandatory reading. ul 508a 3rd edition pdf