What must be present if service conductors are smaller than the overcurrent protection for installations other than one- and two-family dwellings?

The presence of an identification plate showing the ampacity of the conductors is essential when service conductors are smaller than the overcurrent protection in installations other than one- and two-family dwellings. This requirement ensures that anyone working on or inspecting the system can easily identify the current-carrying capacity of the conductors. Proper identification is crucial to prevent overloading, which can lead to overheating and potential fire hazards.

In the context of safety and compliance with electrical codes, having an identification plate helps to maintain a clear understanding of the ratings of conductors in relation to the protective devices installed. This assists electricians and inspectors in verifying that the installation adheres to the necessary safety standards and prevents any potential electrical faults.

While other options such as labeling voltage ratings or having color-coded insulation are important for safety and clarity, they do not specifically address the requirement tied to conductor ampacity in relation to overcurrent protection. Each choice may serve a purpose, but the identification plate directly correlates to the question’s focus on conductor size versus protection methods.