What is the MINIMUM calculated service demand for a sign circuit allowed by the NEC?

The minimum calculated service demand for a sign circuit, as specified by the National Electrical Code (NEC), is 1200 watts. This requirement is in place to ensure that the electrical system can safely handle the load associated with typical sign lighting under normal operating conditions. The NEC establishes these guidelines to promote safety and efficiency, ensuring that circuits are not overloaded and that all installations can support the necessary electrical demands.

The value of 1200 watts serves as a baseline that considers the various types of signs and their operational needs, providing a standard that can be applied in different settings. It reflects a pragmatic approach to electrical design, as it takes into account factors such as the types of lighting used and their typical consumption. This guideline helps electrical contractors calculate load requirements accurately and design systems that are both safe and compliant with the code.