Through-wall lighting assemblies are required to have their circuit conductors sized according to what?

The correct answer relates to the sizing of circuit conductors for through-wall lighting assemblies, which is governed by specific guidelines within the National Electrical Code (NEC). Table 250.122 of the NEC provides the requirements for the sizing of equipment grounding conductors based on the rating of the circuit protective device. This table helps ensure that conductors are appropriately sized to handle potential fault currents, providing a necessary level of safety and compliance for electrical installations.

While the National Electrical Code standards provide an overarching framework for electrical installations, and manufacturer instructions could provide guidelines for specific products, Table 250.122 is the definitive reference for grounding conductor sizing relevant to through-wall lighting assemblies. Company specifications can vary and are typically based on internal requirements rather than standardized codes, which makes them less reliable in ensuring safe practice. Thus, understanding and applying the information in Table 250.122 is essential for maintaining safety and code compliance in these installations.