What regulations govern the installation of overcurrent devices in panelboards?

The installation of overcurrent devices in panelboards is primarily governed by electrical codes and standards. These regulations ensure that such devices are installed safely and effectively to protect electrical circuits from overloads and short circuits. The National Electrical Code (NEC) is a prominent example of such standards, providing detailed guidelines on the selection, installation, and testing of overcurrent devices.

Additionally, the manufacturer's specifications also play a role, as they dictate the appropriate use of their products according to design considerations, performance capabilities, and safety requirements. These specifications must be adhered to alongside the broader electrical codes to ensure compliance and safety.

Therefore, the correct answer highlights that both the manufacturer's specifications and relevant electrical codes and standards govern the installation of overcurrent devices, emphasizing the importance of adhering to both sets of guidelines to achieve safe and reliable electrical installations.