What must service equipment indicate according to NEC Article 230?

Service equipment must provide clear indications of voltage and other relevant information to ensure safe and effective operation. This requirement is crucial for both electricians and users, as it allows for an understanding of the electrical system's capabilities and constraints. Key details such as voltage levels help in assessing compatibility with appliances and devices, which is essential for preventing overloads and ensuring appropriate circuit protection.

Providing only the maximum load capacity, the brand name, or the date of installation does not furnish the necessary information for safe electrical use. While those elements may contribute to other aspects of electrical safety and maintenance, they do not encompass the critical indicators required by the NEC for service equipment. Thus, indicating voltage along with other relevant data is fundamental for compliance with safety standards and practical application in electrical installations.