Cable Tray Fire Protection Calculator

Calculate cable tray fire protection sizing including suppression density and detection per NFPA 850 and IEEE 384.

Input Parameters

Results

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Protection Design Area
ft²
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Water Application Density
gpm/ft²
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Total Water Flow
gpm
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Recommended Detection
Note: NFPA 850 provides cable tray fire protection guidance for electric generating plants. IEEE 384 covers cable separation. Nuclear plants follow NRC Regulatory Guide 1.189. Use IEEE 1202 (vertical tray flame test) rated cables where possible. Linear heat detection or VESDA air sampling provides fastest response.

Reference

NFPA 850 / IEEE 384 Cable Tray Protection: Design Area = Tray Width (ft) * (Tray Length + 40 ft) Base Density: 0.30 gpm/ft² (PVC), 0.20 gpm/ft² (FR-rated) Stack Adder: +0.05 gpm/ft² per additional tray Fill Factor: 1.10 for fill > 50% Total Flow = Design Area * Adjusted Density Ref: NFPA 850 Sec 9.4, NRC RG 1.189