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Is it okay to run the automatic control cable through the fire cable tray

It is generally not recommended to run automatic control cables through a fire-rated cable tray unless the installation meets fire safety and code requirements, including proper separation, fireproofing, and insulation.

Fire Safety Considerations

Running control cables through a cable tray that is also designated for fire-rated circuits can pose fire propagation risks. Metal trays can conduct heat, and vertical or open trays can act like chimneys, allowing fire and smoke to spread quickly if a cable fails or arcs occur . Cables in trays may contribute to thermal load and accelerate fire spread if not properly protected .

Code and Installation Requirements

  • NFPA 70 (NEC) and NFPA 20 govern fire pump and control circuits. Electrical installation requirements for fire pump controllers, including automatic control cables, must comply with these standards .
  • Separation of circuits is often required. Power, control, and fire alarm cables may need to be routed separately to prevent interference and ensure reliability during a fire .
  • Fire-rated cable trays or enclosures may be required if the tray passes through fire-rated walls or slabs. This can involve wrapping the tray with insulation, using fireproof boards, or applying mastic according to manufacturer test evidence .

Practical Recommendations

  1. Use fire-resistant cables for automatic control circuits if they must share a tray with fire-rated cables .
  2. Maintain separation between power and control circuits to reduce the risk of electrical interference and fire propagation .
  3. Protect tray penetrations through fire-rated walls or floors with approved fire-stopping methods to maintain the building's fire containment .
  4. Avoid vertical stacks of mixed cables without fire barriers, as these can act as chimneys and accelerate fire spread .
  5. Follow manufacturer and code guidance for tray installation, insulation, and fireproofing to ensure compliance and safety .

Conclusion

While it is technically possible to run automatic control cables through a fire-rated cable tray, it must be done with careful attention to fire safety, code compliance, and proper separation. Using fire-resistant cables, fire-stopping methods, and following NFPA and NEC guidelines is essential to prevent fire hazards and ensure reliable operation of control systems during emergencies.

Is it okay to run the automatic control cable through the fire cable tray - Roof Repairs Telecom Solutions [PDF]

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