Is it true that Chapter 9, Table 1 of the National Electrical Code applies when conductor sizes and/or insulations are mixed?

In this context, the application of Chapter 9, Table 1 of the National Electrical Code (NEC) pertains to the sizing of conductors. The primary function of this table is to provide necessary guidelines for determining the appropriate conductor sizes based on specific insulation types and conditions. However, it does not apply when conductors of different sizes or insulation types are mixed in a way that could potentially introduce safety risks or code violations.

The NEC recognizes that mixing different insulation types or sizes can lead to performance inconsistencies and safety issues, which is why separate guidelines are established for each distinct type of conductor. Therefore, stating that the table is applicable in such mixed situations would not align with the intent of the code, which aims to ensure safe and reliable electrical installations.

This principle reinforces the importance of adhering strictly to the specified conductor sizes and insulation materials as outlined in the NEC, thereby enhancing safety and functionality in electrical systems. In scenarios where mixed conductors are used, a different set of considerations and guidelines would need to be observed, supporting the assertion that the answer is indeed false regarding the table's applicability in those cases.