Industrial Control Panels UL 508A & Short Circuit Current Ratings


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, 3rd 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; standards for components, Appendix A; use of non-UL components, Appendix B; and component usage, Appendix C.

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, 3rd Edition, Supplement SB.  This supplement is the only method specifically noted as being recognized by the NEC.

Each participant will receive a participant workbook and a copy of the UL 508A Standard ($897 USD value).


Workshop Topics

  • Introduction to industrial control panels
  • Development of UL 508A
  • Project categories & UL directory information
  • UL's certification program for industrial control panels
  • General requirements for all panels
  • Construction requirements for enclosed panels
  • Power circuits
  • Control circuits
  • Ratings and markings
  • Industrial control panel enclosures
  • Appendix A-Standards for components
  • Appendix B-Use of non-UL components
  • Appendix C-Component usage
  • Supplement SB-Short circuit ratings


  • 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 C 1.1 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

  • Control panel designers and engineers
  • Regulatory compliance engineers
  • Control panel manufacturers
  • Industrial control and power distribution equipment manufacturers
  • Electrical Inspectors and enforcers of the NEC

Continuing Education Units (CEUs)

  • 1.0 IACET CEUs; contact your local jurisdiction for CEU recognition.

Related Training:

Expand the market of your industrial control panels by adding hazardous locations acceptance. You can learn about the requirements by attending our workshop on UL 698A Industrial Control Panels Relating to Hazardous (Classified) Locations. This program is available at select locations. Attend both workshops through a bundled offering.

Click here for details and registration info on the bundled workshop!



100% of the tuition paid for this workshop will be credited toward new company entry into the UL 508A Industrial Control Panel Listed Shop Program for applications submitted within 90 days of workshop completion*.

*Offer limited to one paid tuition rebate per company. Credit applied at time of project initiation. Contact your local UL Sales Representative by email at Industrialquote@ul.com or by calling 1-888 ULHelps (1-877-854-3577) ex.49463

Click here for terms and conditions...


Time Requirement


Instructor-Led 1.5 days $875.00

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