Mechanicals · definition
Arc-Fault Circuit Interrupter — detects dangerous arcing that can start fires. Code now requires it on most living-space circuits; remodels must add it.
Source: ESFI — Arc-Fault Circuit Interrupters (AFCIs)
Where this term lands on a Columbus budget
The cost pages carry the current local ranges, and the guides explain what moves them. A published range becomes a project number only after someone looks at the site.