If you are reviewing the , these are the chapters you will tab immediately:
To appreciate the rigor of the , consider the 2016 fire in the Baltimore Harbor Tunnel. If you are reviewing the , these are
When you download the PDF, pay close attention to the "Annex A" (Explanatory Material), which provides the forensic history of why each clause was added. The includes detailed design specs for nozzle spacing
Recent editions require automatic sprinklers or water mist systems in tunnels with high Average Daily Traffic (ADT). The includes detailed design specs for nozzle spacing to overcome the "plughole" effect (fans blowing spray away from the fire). a fire marshal reviewing plans
Category B: Tunnels between 300 and 1,000 feet (90–300 meters).
Whether you are a civil engineer designing a new mountain crossing, a fire marshal reviewing plans, or a facility manager maintaining an aging bridge, the NFPA 502 PDF must be the first tool in your bag.