Where type NM cable passes through openings in metal members, it shall be protected by ______ bushing or ______ grommets.

When type NM (non-metallic sheathed) cable passes through openings in metal members, it is essential to protect the cable to prevent damage from sharp edges and to ensure compliance with safety standards. The correct terminology for this requirement involves using a listed bushing or listed grommets.

Listing indicates that the bushing or grommet has been evaluated and meets specific safety and performance standards established by recognized testing laboratories. This provides assurance that these protective components will adequately safeguard the cable from potential hazards, such as abrasion or cuts. By adhering to the requirement for listed components, installers can ensure compliance with the National Electrical Code (NEC) and enhance the overall reliability and safety of the electrical installation.

Choosing non-listed options would not meet the necessary safety requirements and could put both the installation and the occupants at risk. Hence, it is crucial to use listed bushing or grommets when NM cable interacts with metal members.