Where provided with a disconnecting means listed as suitable for service equipment, and where overcurrent protection is provided, an interconnected electric power production source is permitted to connect to a service through a(n) ___.

Where provided with a disconnecting means listed as suitable for service equipment, and where overcurrent protection is provided, an interconnected electric power production source is permitted to connect to a service through a(n) ___.

• A. Spliced tap conductor on the service drop or lateral
• B. Approved isolation transformer
• C. Additional set of service conductors
• D. None of these methods are permissible

Answer: (C)

The key idea is that interconnecting an on-site power source to a building’s service must be done so that protective devices and the service disconnect can still properly isolate the system. When the disconnecting means is listed for service equipment and overcurrent protection is provided for the source, the permitted method is to connect through an additional set of service conductors. This means running a separate conductor path from the service equipment to the power production source, typically via a backfed protection device inside the service equipment, so the interconnection is coordinated with the service main and can be shut off by the same disconnect. It maintains proper protection and clear disconnects without bypassing protective devices. Other approaches would not meet the required coordination and protection, whereas this method fits the conditions stated.

The key idea is that interconnecting an on-site power source to a building’s service must be done so that protective devices and the service disconnect can still properly isolate the system. When the disconnecting means is listed for service equipment and overcurrent protection is provided for the source, the permitted method is to connect through an additional set of service conductors. This means running a separate conductor path from the service equipment to the power production source, typically via a backfed protection device inside the service equipment, so the interconnection is coordinated with the service main and can be shut off by the same disconnect. It maintains proper protection and clear disconnects without bypassing protective devices. Other approaches would not meet the required coordination and protection, whereas this method fits the conditions stated.