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panel design and subassembly, many manufactures use the. UL 508A Supplement SB approved method for calculating the. SCCR rating of the panels.Reference Manual. 06/2013. A5E31896849002A/RS-AA/001. Introduction. 1. Overview of NEC Article 409. 2. Overview of Supplement SB from the UL 508A standard. FPN: UL 508A-2001, Supplement SB, is an example of an approved method. Exception to (3): Short-circuit current rating markings are. Informational Note: ANSI/UL 508A, Standard for. Industrial Control Panels, Supplement SB, is an example of an approved method. Evaluate panel per UL508A, Supplement B (required by 4-06 if jurisdiction does not adopt 2005 NEC earlier). □ All components in power circuit must have ratings. Overview of Code Changes in NEC Article 409. UL 508A Supplement SB UL508A is a safety standard for Industrial Control Panels adopted by Underwriters nec® recognizes ul 508a, the Supplement SB as an approved method for determining panel Sccr. as of april 25,. 2006, ul 508 listed panels must be marked with This revision of UL 508A is issued to correct Table SB4.1 to remove the SUPPLEMENT SB - SHORT CIRCUIT CURRENT RATINGS FOR INDUSTRIAL CONTROL PANELS. This document is intended to be used to determine the requirements for components when used in industrial control panels.