What is a separately derived system?

A separately derived system is best defined as an independent electrical source that is not directly connected to other electrical supply sources. This means it operates autonomously and typically generates its own power, such as through generators, transformer systems or other types of power generation. Such systems are designed to provide isolation from other sources of electricity, which enhances safety and ensures it can operate independently in cases where the primary source is unavailable.

This definition is crucial in understanding how such systems are utilized in various applications, including in environments where electrical isolation is necessary for safety or operational reasons. The criteria for a separately derived system often involve strict adherence to electrical codes and standards to ensure they meet safety regulations.