No, the building itself (especially just its exterior masonry block wall) cannot be considered a "listed fire-rated assembly" for the purposes of complying with 700.10(D)(1) when running emergency feeders outside the building. Here's why: Listing Requirement

The code explicitly states "a listed fire-rated assembly." Listing implies third-party certification by an organization like UL or Intertek. A building wall (even masonry) is not a listed assembly. You can't point to a UL or other certification mark on the wall itself. While the wall's construction may provide some inherent fire resistance, it hasn't been tested and certified to the specific 2-hour fire rating requirement in the NEC.

Scope of the Assembly

The "fire-rated assembly" is designed to protect the wiring method and maintain circuit integrity. A building wall, even a substantial one, does not inherently protect wiring run on its exterior surface from fire-related hazards like: Flame impingement directly on the EMT and conductors. Mechanical damage from falling debris. Overheating of the conductors if the building wall itself becomes intensely hot.

"Contains Only Emergency Circuits" Limitation

The code provision you cited (the fifth option) requires the fire-rated assembly to contain only emergency circuits. A building wall almost certainly contains other non-emergency circuits. Therefore, even if it were a listed fire-rated assembly, it would not meet this requirement.

Acceptable Solutions for Outside Runs Based on Your Code Excerpt

Given that you are running the feeder outside the building, and assuming your building doesn't have a full fire suppression system, here are the most likely compliant options based on the NEC 700.10(D)(1) excerpt:1. Listed Electrical Circuit Protective System

This often involves using a wrap or coating system applied to the EMT and conductors. Check the UL FHIT (Electrical Circuit Integrity Systems) directory for specific products and installation instructions. Products like these are specifically designed to provide a 2-hour fire rating when applied correctly.2.

Listed Fire-Resistive Cable System

Use a cable that's specifically listed as fire-resistive and has a 2-hour rating per UL 2196. These are often mineral-insulated (MI) cable or other specially constructed cables.
3.

Encased in Concrete

Encase the EMT and conductors in a minimum of 2 inches of concrete. This is a less common approach, but it does meet the code requirement. It can be difficult to install and maintain.

Recommendation

The most practical solution for an exterior run of emergency feeder, based on your constraints, is typically a listed electrical circuit protective system (option 1). Work with a qualified electrical contractor and supplier to select a system that is appropriate for your application and environment.

Important Considerations Local Amendments

Always check for local amendments to the NEC. Your jurisdiction might have specific requirements or interpretations of 700.10(D).

AHJ Approval

Consult with your local Authority Having Jurisdiction (AHJ) (e.g., the electrical inspector) to confirm that your proposed solution meets their requirements before you begin installation. Get their approval in writing if possible.

Manufacturer's Instructions

Carefully follow the manufacturer's installation instructions for any listed systems or cables you choose. Improper installation can void the listing and compromise the fire protection.

Conductor Derating

Pay attention to conductor derating factors, especially if the conductors are exposed to direct sunlight or run in a hot environment. This is a standard practice in electrical installations.

Mechanical Protection

Ensure that the EMT is adequately supported and protected from mechanical damage, as required by the NEC.

Grounding and Bonding

Properly ground and bond the EMT and equipment grounding conductors according to the NEC.*

Disconnect Means: Ensure that the emergency system has the required disconnect means and labeling as per the NEC. Flag for review