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NFPA 15 , 7.4.3.8.1 Cable Exposure protection

Question asked by sbkim on Jan 16, 2019
Latest reply on Jan 21, 2019 by nocivus

Sir, As per NFPA 15, 7.4.3.8 Cable Trays and Cable Runs. 7.4.3.8.1

 

Where insulated wire and cable or nonmetallic tubing in open trays or runs is to be protected by water spray from a spill fire exposure, a net rate of not less than 0.30 gpm/ft2[12.2 (L/min)/m2]  of projected horizontal or vertical plane area containing the cables or tubes shall be provided.

 

If I have 7 level of cable tray one over the other with space in between , does above code referrence imply that nozzles has to be provided separate for each level of tray to provide a net rate of not less than 0.30 gpm/ft2[12.2 (L/min)/m2]  to each level of tray.

 

or Can we provide nozzles to cover the trays as a group i.e. may be through a level of nozzles to provide a net rate of not less than 0.30 gpm/ft2[12.2 (L/min)/m2]  to the trays. 

 

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