In an area used for patient care, Type MC cables shall have an outer metal sheath that is ___ as an acceptable grounding return path. I. listed II. identified III. approved

In an area used for patient care, Type MC cables shall have an outer metal sheath that is ___ as an acceptable grounding return path. I. listed II. identified III. approved

• A. I only
• B. I & II only
• C. II & III only
• D. II only

Answer: (B)

The key idea here is that the outer metal sheath of Type MC cable can serve as the equipment grounding conductor only if the sheath is specifically evaluated and marked for that purpose. Listing means the sheath has been tested and approved for use as a grounding path by a recognized standards lab. Identification means the product is marked to show it is permitted to be used as an equipment grounding conductor. The combination of listed and identified ensures both evaluation and explicit authorization for grounding use. Simply being approved without the formal labeling or without listing does not meet the requirement, and identifying alone without listing doesn’t guarantee the necessary evaluation. So, the outer metal sheath must be both listed and identified as an acceptable grounding return path.

The key idea here is that the outer metal sheath of Type MC cable can serve as the equipment grounding conductor only if the sheath is specifically evaluated and marked for that purpose.

Listing means the sheath has been tested and approved for use as a grounding path by a recognized standards lab. Identification means the product is marked to show it is permitted to be used as an equipment grounding conductor. The combination of listed and identified ensures both evaluation and explicit authorization for grounding use. Simply being approved without the formal labeling or without listing does not meet the requirement, and identifying alone without listing doesn’t guarantee the necessary evaluation.

So, the outer metal sheath must be both listed and identified as an acceptable grounding return path.