Industrial Control Panels UL 508A and Short-Circuit Current Ratings


El seminario se realizará en castellano. El material del seminario solo estará disponible en inglés.

This seminar will be held in Spanish language. The course materials are in English language.



The introduction of the new Article 409 for Industrial Control Panels in the 2005 edition of the National Electrical Code (NEC) drew increased attention to installations of industrial control panels. Industrial control panels (ICPs) with the UL Mark are installable to the NEC and have a distinct competitive edge in the marketplace.

The first day of the workshop focuses on how to construct general use industrial control panels in accordance with the Standard for Industrial Control Panels, UL 508A, 2nd Edition. It covers UL 508A, general use ICP construction, power circuit, control circuit, rating and marking requirements, sections 1-61; enclosure construction requirements, sections 62-64; component requirements in Supplement A and Appendices A and B.

The second day instructs industrial control panel customers on how to establish short-circuit ratings for individual industrial control panels in accordance with the requirements outlined in the new Standard for Industrial Control Panels, UL 508A, 2nd Edition, Supplement B.  This supplement is the only method specifically noted as being approved by the NEC.

Each participant will receive a participant workbook and a copy of the UL 508A Standard ($631 USD value).


Workshop Topics

  • Introduction to industrial control panels
  • Development of UL 508A
  • Project categories & UL directory information
  • Part 1 of UL 508A-general use
  • Part 1 of UL 508A-construction
  • Power circuits
  • Control circuits
  • Ratings and markings
  • Supplement SA-Component usage
  • Supplement SB-Short circuit ratings
  • Annex A-Standards for components
  • Annex B-Use of non-UL components


  • Discuss and define power circuit and control circuit construction requirements
  • Define and apply appropriate electrical spacing between un-insulated parts of components
  • Determine proper segregation of insulated conductors of separate circuits
  • Determine the appropriate branch circuit protection sizing and individual component selection
  • Describe transformer over-current protection
  • Navigate UL 508A Table SA1.1 and the UL Web to determine component suitability/ cost saving methods
  • Execute proper application of supplementary protectors
  • Explain panel rating and marking requirements
  • Identify a short circuit current rating marking
  • Demonstrate through course activities how to identify and calculate short-circuit ratings

Target Audience

  • Panel product designers and engineers
  • Regulatory compliance engineers
  • Panel manufacturers

Special Offers

For more participants or early enrollment discounts, please contact UL at: ULKnowledgeservices.eu@ul.com
Click here for terms and conditions...


Time Requirement


Instructor-Led 2 days 1 395,00 €

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