What must portable signs in wet locations have for personnel protection?

In wet locations, portable signs must incorporate a ground fault circuit interrupter (GFCI) for personnel protection. A GFCI is designed to protect individuals from electric shock, particularly in areas where water may present a risk, such as with portable signs that could be exposed to rain or splashes.

The GFCI monitors the current flowing through the circuit and can detect imbalances that indicate a leakage current, which could be due to moisture or exposure to water. When it detects such an imbalance, the GFCI quickly disconnects the power, reducing the risk of electrical shock. This safety feature is crucial in ensuring that any electrical equipment used in wet locations adheres to safety standards that protect both users and maintenance personnel.

While other choices may also relate to safety and functionality in specific contexts, the primary consideration for personnel protection in this scenario is the use of a ground fault circuit interrupter, which addresses the specific risks associated with electrical devices operating in potentially wet environments.