What is the required short-circuit current rating (SCCR) for panelboards?

The required short-circuit current rating (SCCR) for panelboards is generally above 5,000 amps because panelboards are typically designed to handle significant fault currents that may occur during a short-circuit event. This level of SCCR ensures that the panelboards can safely interrupt these fault currents without sustaining damage, which is crucial for maintaining safety and reliability in electrical systems.

Higher SCCR levels are essential in applications where large motor circuits or multiple feeders might cause substantial short-circuit currents. Rating panelboards above 5,000 amps provides a buffer against the potentially dangerous effects of short circuits, including equipment damage and fire hazards. This also aligns with industry standards and code requirements aimed at ensuring that electrical equipment can withstand the stress of fault conditions without failure.

In contrast, the other options indicate SCCR ratings that are insufficient for most applications, especially in commercial and industrial settings where higher levels are expected. Therefore, understanding the context surrounding the typical operational parameters and safety standards is critical for design and installation practices.