The 2005 National Electric Code and the Underwriters Laboratory product standards have changed. GE is committed to helping our customers understand how these changes affect their products.
Through extensive product testing GE provides customers with safe and comprehensive solutions to conform to required standards and accurately rate industrial control panels.
What makes GE better? GE provides added application design flexibility by having tested contactors separately from overloads. This test data allows designers to obtain a high short circuit current rating (SCCR) for their control panels, as validated by the Underwriters Laboratory, when using contactors with or without overloads.
Understanding NEC Article 409 & UL 508A
UL 508A Supplement SB
Supplement SB is the UL approved method for determining the SCCR for industrial control panels based on the power circuit components within the industrial panel.
Components requiring an SCCR for use in UL508A industrial control panels
Short Circuit Current Rating (SCCR)
Contactors and Overloads SCCR Ratings Instruction Sheets with SCCR Ratings (UL Tested Combinations) (PDF)
Feeder Components that limit SCCR Available (UL 508A SB4.3)
Establish SCCR of Individual Power Circuit Components (UL 508A SB4.2)
Building a Control Panel?
Determine the overall SCCR of the Industrial Control Panel (UL 508A SB4.4)