Surge protective devices may be installed on circuits of up to how many volts?

Surge protective devices (SPDs) are designed to protect electrical systems from voltage spikes caused by events such as lightning strikes, power surges, or switching operations. The installation of SPDs is crucial, especially in residential and commercial buildings, where sensitive electronic equipment is often used.

The correct voltage limit for the installation of surge protective devices is up to 1000 volts. This rating aligns with industry standards and practices, which indicate that SPDs are typically effective for systems operating within this voltage range. It covers a wide variety of applications, including both residential and light commercial power systems, which generally operate at up to 600 volts for standard circuits.

Understanding this limit is important for ensuring that SPDs provide adequate protection without compromising the safety or functionality of the electrical system. Devices rated for voltage levels beyond 1000 volts, such as those up to 1200 volts or more, are considered specialized equipment and are not typically used in standard residential installations.

The other options reflect voltages that exceed the standard rating for typical surge protection in residential applications, which is why they are not considered the correct answer. The specification of 1000 volts ensures a balance between effective surge protection and electrical safety.