Which of the following best describes Chapter 9 of the NEC?

Chapter 9 of the National Electrical Code (NEC) is primarily known for its tables, which include critical information for electrical installations. These tables become enforceable when referenced in the code, meaning that they must be followed in compliance with the NEC. This enforces a standard approach to calculations and installations, ensuring that all electrical components are safe and efficient. By using these tables, electricians and designers can ensure that their work adheres to required specifications, promoting safety and reliability in electrical systems.

The other options do not accurately describe the purpose of Chapter 9. For instance, while it contains tables that are useful, it is incorrect to classify them as non-enforceable. Additionally, the content of Chapter 9 is not limited to engineering tables for electrical designers; instead, it serves a broader purpose in standardizing information applicable to various electrical applications. Lastly, although the chapter may include load calculation examples, its primary focus is on providing structured tables that are explicitly enforceable when referenced in the application of the NEC.