Type 2 SPDs shall be connected anywhere on which side of a service disconnect overcurrent device?

Type 2 surge protective devices (SPDs) are designed to be installed downstream of a service disconnect overcurrent device. This means they are connected on the load side of the disconnect. The purpose of this installation is to protect equipment from overvoltages that may occur after the service disconnect, ensuring safety and preventing damage to the connected loads.

Connecting SPDs on the load side allows them to effectively divert transient overvoltages from the electrical system. In this position, the surge protection is applied directly to the circuits that supply power to sensitive equipment, thus enhancing their longevity and reliability.

In addition, connecting SPDs on the load side provides the benefit of ensuring that the surge protective device can engage and operate independently of the service disconnect, which is crucial during a surge event. This placement is a standard practice to ensure that there is adequate protection for all devices connected downstream.