What type of receptacle must be installed for portable or mobile electric signs?

The installation of weatherproof receptacles is essential for portable or mobile electric signs due to their exposure to outdoor elements. Weatherproof receptacles are designed to prevent moisture, dust, and debris from entering the electrical components, ensuring safe and reliable operation in varying environmental conditions. This type of receptacle typically features a protective cover that seals when not in use, which is crucial for preventing short circuits or electrical failures that can occur if water or humidity seeps into the connections.

Standard indoor receptacles do not provide the necessary protection against the elements, and using them outdoors can lead to significant safety hazards. Ground fault protected receptacles, while important for certain applications, are not specifically designed to withstand exposure to the weather, and heavy-duty receptacles, though robust, may not provide the necessary weather protection. Thus, for portable or mobile electric signs, a weatherproof receptacle is the appropriate choice, ensuring compliance with safety regulations while safeguarding against environmental conditions.