According to regulations, how must the system bonding jumper for a separately derived system be installed and sized?

The system bonding jumper for a separately derived system is specifically addressed in the National Electrical Code (NEC), particularly in sections 250.30 and 250.28. The requirements outlined in 250.28(A) through (D) detail the necessary installation and sizing criteria for the system bonding jumper.

This section provides comprehensive guidelines that ensure proper grounding and bonding practices are followed, which are essential for safety and the effective operation of the electrical system. It covers critical aspects such as the conductor size relative to the system's capacity and methods for connecting the jumper, which are not just arbitrary but are based on careful engineering principles to prevent electrical shock hazards and equipment malfunction.

Choosing this option reflects a clear understanding of the regulatory framework set forth in the NEC, which is vital for compliance and safety in electrical installations. Other choices may reference local codes or manufacturer recommendations, but the NEC is the definitive source for these specific regulations.