You're correct, running fire-rated cable throughout a multi-story building for a fire alarm system is a significant expense. While there isn't a single "magic bullet" solution to make regular wire equivalent to 2-hour fire-rated cable, there are strategies that might be acceptable depending on your local AHJ (Authority Having Jurisdiction) and the specific requirements of your fire alarm system and the Rath system. The critical thing is to get pre-approval from the AHJ before you proceed with any alternative.

Here's a breakdown of potential solutions and the factors you need to consider

1. Dedicated Conduit, Raceways, and Junction Boxes with Firestop:
Concept

Encasing the regular wiring within a continuous, protected raceway that maintains fire resistance.

Details



Rigid Metal Conduit (RMC) or Intermediate Metal Conduit (IMC)

These are your best bet for conduit. They are inherently more fire-resistant than EMT (Electrical Metallic Tubing), although you might be able to use EMT with specific firestop measures.

Fire-Rated Conduit Fittings

Use fittings that are specifically listed for fire-rated applications (e.g., threaded fittings tightened properly, or fittings with fire-rated sealing compounds).

Fire-Rated Junction Boxes

The boxes must also be fire-rated. Look for junction boxes with a listed fire-resistance rating matching the required duration (2-hour in your case).

Firestopping

This is absolutely essential. Wherever the conduit or raceway penetrates a fire-rated wall or floor, you must use a listed firestop system to seal the penetration. The firestop system's rating must equal or exceed the fire-resistance rating of the wall or floor. This includes the proper application of firestop caulk, putty, or other materials according to the manufacturer's instructions.

Continuous Run

The entire run from the call station on one floor to the call station on the next must be within the protected raceway. You can't transition to regular wiring anywhere along the way.

Considerations



AHJ Approval is Mandatory

The AHJ will need to verify that the proposed conduit system, junction boxes, and firestopping provide the required fire resistance. They may require documentation (listing information, test reports) to support your claim.

Installation Quality

Proper installation is crucial. Gaps, loose fittings, or improperly applied firestop will compromise the fire resistance of the system.

Cost

While regular wire is cheaper than fire-rated cable, the cost of RMC/IMC, fire-rated boxes, fittings, and especially the firestopping materials and labor can add up. Get a detailed cost comparison.

Accessibility

Consider how accessible the conduit run will be for future maintenance or repairs.

2. Fire-Rated Enclosures at Each Call Station (Less Likely to be Approved, but Worth Checking)



Concept

Protecting the wiring only at the point of connection to the call station with a fire-rated enclosure.

Details

Use fire-rated boxes at each call station location. The wiring within the wall cavity may still need to be fire-rated or protected in conduit, depending on local codes.

Considerations



Very Unlikely to Be Sufficient

This approach is less likely to be accepted because it only addresses the wiring at the call station, not the entire run between floors. The fire resistance of the cable run itself is still a concern.

May Need Additional Protection

Even with fire-rated enclosures, the wiring inside the wall cavity leading to the enclosure might still need to be protected.

Check Local Codes

This option might be more acceptable if local codes permit it and the AHJ approves.

3. Alternatives to Running Cable Between Floors



Wireless Communication (with Battery Backup)

Consider if a wireless solution for the Rath system is feasible. If the Rath system offers a wireless option, and it meets the reliability and survivability requirements of the fire alarm system, it could eliminate the need for inter-floor cabling altogether. It must have battery backup that meets the fire alarm system requirements.

Fiber Optic Cable (If the Rath System Supports It)

Fiber optic cable is inherently fire-resistant and doesn't conduct electricity. If the Rath system can operate over fiber, and you have a pathway for it, this could be an option.

Existing Fire-Rated Raceways (Careful Evaluation Required)

If the building already has existing fire-rated raceways (e.g., for other fire alarm circuits), possibly you could use them, but only if: There's sufficient capacity. The raceway is accessible. The AHJ approves the use of the existing raceway for the Rath system. The existing raceway meets all the requirements for a 2-hour fire rating.

Important Considerations for Any Option



National Electrical Code (NEC)

All wiring and installations must comply with the NEC. Article 760 (Fire Alarm Systems) is particularly relevant.

NFPA 72 (National Fire Alarm and Signaling Code)

This code provides standards for the design, installation, inspection, testing, and maintenance of fire alarm systems.

Local Building Codes

Your local building codes may have specific requirements for fire-rated wiring and systems.

Manufacturer's Specifications

Follow the Rath system manufacturer's instructions for wiring and installation.

Steps to Take


Consult the AHJ

The very first step is to contact your local AHJ (fire marshal, building inspector, etc.) and discuss your situation. Explain that you're looking for cost-effective alternatives to running fire-rated cable and ask for their guidance on acceptable solutions. Present your proposed method in detail.2.

Review Codes and Standards

Thoroughly review the NEC, NFPA 72, and your local building codes to understand the requirements for fire alarm systems and fire-rated wiring.3.

Get Quotes

Obtain detailed quotes for both fire-rated cable and the alternative solutions you're considering. Include the cost of materials, labor, and firestopping.4.

Prepare Documentation

Gather documentation about the fire-resistance ratings of the conduit, fittings, boxes, and firestop systems you plan to use. Have this information ready for the AHJ.5.

Document Everything

Keep a meticulous record of all communications with the AHJ, the codes and standards you're following, and the materials you're using.6.

Inspection

Be prepared for thorough inspections of the installation to ensure compliance with all requirements.

In summary, while using conduit might* be a more cost-effective option than fire-rated cable, it requires careful planning, adherence to codes and standards, and, most importantly, the approval of the AHJ. Don't assume anything. Get it in writing before you start the installation. Good luck! Flag for review