A surge-protection device is required to be installed on a feeder in all of the following locations except for ___.

• A. Dwelling units
• B. Operating rooms
• C. Dormitories
• D. Guest suites of motels

Answer: (B)

Surge protection devices on feeders are used to clamp voltage transients and protect downstream equipment from surges that can damage electronics or disrupt operation. In many occupancies, the distribution feeding everyday loads—like in homes, dormitories, and guest rooms in motels—benefits from having SPDs on the feeders to guard the circuits that power sensitive equipment.

Operating rooms use a specialized medical power distribution arrangement, often with dedicated, isolated, and often UPS-backed circuits to ensure uninterrupted, clean power for life-supporting and critical medical devices. Because of these unique protections and requirements, a surge-protection device on the feeder is not required in operating rooms.

So the location that does not require a surge-protection device on the feeder is the operating room.