The excerpt from the NFPA 2019 regulations that pertains specifically to freeze protection is listed below. The approval is for the latest NFPA 13, IEEE 515.1 and UL 515A for installation of heat cable on wet fire sprinkler piping. The electric heat trace systems for fire sprinkler freeze protection that we design, and supply are listed and approved. To prevent this avoidable event from occurring, Nversion permits the use of energy efficient electric heat trace to be used with an insulated and weatherproof jacket so that the sprinkler pipe is maintained at or above the required 40☏. This can cause blockages in the pipe and in some instances, cause pipes to crack or burst. When the water in a wet pipe fire sprinkler system freezes, it typically expands 10%or more.
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