Final answer:
Steel electrical boxes that do not exceed 100 square inches are typically permitted to penetrate maximum 2-hour fire-resistance-rated walls or partitions according to common building and fire codes such as the NEC and IBC.
Step-by-step explanation:
The question pertains to the building codes and regulations that govern the installation of electrical boxes in walls with a fire-resistance rating.
To answer the question regarding the size limitation for steel electrical boxes that can penetrate a maximum 2-hour fire-resistance-rated wall or partition, we need to refer to the applicable building or fire code.
While the exact value can vary based on specific local amendments, the National Electrical Code (NEC) and the International Building Code (IBC) typically allow steel electrical boxes that do not exceed 100 square inches to penetrate such walls without requiring additional fire stopping materials. These provisions are designed to maintain the integrity of the fire-resistance-rated barrier while allowing for necessary building services.