Master Electrician Practice Exam 2025 - Free Master Electrician Practice Questions and Study Guide

Leaving abandoned supply circuits in place within an information technology equipment room is permissible when they are contained in a raceway. This is because raceways provide a protective enclosure that ensures the abandoned circuits do not pose a safety hazard. The raceway confines the conductors, helping prevent accidental contact, and protects them from physical damage. This containment is a critical safety consideration in environments with sensitive equipment, as it maintains a clear and organized space while also adhering to electrical codes that govern abandoned wiring.

In contrast, the other options do not provide sufficient safety or compliance guarantees. Leaving circuits that are not live could still pose risks in certain situations, making marking or insulation alone insufficient precautions without proper containment. Therefore, proper raceway use represents the safest and most code-compliant approach for keeping abandoned circuits in an IT room.