According to the NEC, which of the following statements about receptacles is true?

All of the statements regarding receptacles are true according to the National Electrical Code (NEC).

Receptacles are required to be listed under an approved testing laboratory, ensuring they meet specific safety and performance standards. This requirement provides assurance that the receptacles have been tested for safe use and comply with established codes.

Additionally, receptacles must be marked with the manufacturer's name or identification. This marking is essential for traceability and accountability, allowing customers and inspectors to verify that the product meets regulatory standards.

Furthermore, marking receptacles with their voltage and ampere rating is vital for safety. It informs users of the electrical specifications, helping to prevent overloads and ensuring the receptacle is used in accordance with its intended applications.

Since each of these points is a requirement outlined by the NEC, the conclusion that all of the statements are true is accurate. By adhering to these regulations, electrical safety and system reliability are significantly enhanced.