Protect Your HVAC System from Damaging Fault Currents

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February 2, 2021

As the demand for electric power continues to increase, so does available fault currents. When available fault currents at the HVAC equipment exceed the panel’s short circuit current ratings (SCCRs), there can be catastrophic results.

Watch Littelfuse’s new video Learn How to Calculate and Increase the SCCR for an overview of the popular method using the UL 508A Supplement S-B, which includes:

  •    –   Step 1: Evaluating the SCCR of each branch circuits
  •    –   Step 2: Evaluating all the SCCRs for the components in the feeder circuit
  •    –   Step 3: Identifying interrupting ratings for each overcurrent protective device
  •    –   Step 4: Finding the lowest value from Steps 1 through 3




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