___ may be connected ahead of service switches. I. Surge arrestors II. Cable limiters

• A. I only
• B. II only
• C. neither I nor II
• D. both I and II

Answer: (D)

The key idea is how protective devices can be placed on the line side of the service disconnect to shield the service conductors and equipment before they reach the main switch.

Surge arrestors (surge protection devices) are designed to clamp or divert transient overvoltages caused by lightning or switching events. Placing them ahead of the service switch helps keep voltage spikes from propagating into the service equipment and downstream circuits, protecting everything connected to the panel.

Cable limiters are devices that help restrict fault current levels to protect cables and other equipment from damage during a short circuit. When installed ahead of the service switch, they limit the amount of fault current that can reach the service conductors and the main switchgear, aiding in preventing insulation damage and reducing the energy the main disconnect must handle.

Because both devices serve to protect the line-side circuitry and can be installed on the supply side of the service disconnect, they may be connected ahead of the service switches. Proper ratings, installation practices, and adherence to NEC requirements are essential for safe and compliant use.