The TAP boxes (Tunnel Application Power) from Phoenix Contact have been specially developed for safe, fireproof, and simple power distribution in tunnels. A wide variety of LV electrical distribution equipment can be required on a tunnel project. Main LV supplies into tunnels are often provided with a back-up stand-by generator and our Mains Distribution Assemblies (MDAs) can incorporate Manual or Automatic Changeover systems to switch between Mains. This FHWA manual is intended to be a single-source technical manual providing guidelines for planning, design, construction and rehabilitation of road tunnels, and encompasses various types of road tunnels including mined, bored, cut-and-cover, immersed, and jacked box tunnels. These boxes feature bottom entry and exit cables, front-opening doors, and main busbars connected with copper strips for optimal contact. Starting from the main distribution, the TAP box supplies power to your individual tunnel applications, such as the lighting and evacuation. That is, a distribution electric box is arranged under the general distribution box, and a switch box is arranged under the switch box, and electrical equipment is arranged under the switch box to form a three-level distribution. This installation has to satisfy two essential requirements: Meet the needs under all operational situations (normal, degraded, critical.
