Understand Commercial Electrical Wiring Code for Wire Types

What happens here

The video presents an electrician discussing a failed inspection for using 4/0 aluminum (AL) wire for a 200-amp service in a home conversion to an office, which is considered a commercial application. The central point is that 4/0 aluminum wire is not permitted for commercial services. The electrician explains that aluminum wire is typically only acceptable for residential wiring. For commercial projects, copper wire is mandated by code, and he gives an example of using 350 MCM copper for a 300-amp service.

Goal: Learn the distinction between residential and commercial electrical wiring requirements, specifically regarding aluminum versus copper wire usage.