Complejos industriales, comerciales o de servicios compartidos, tales como edificios de estaciones ferroviarias, aeropuertos, hospitales, grandes zonas de acampada con instalaciones integradas o complejos de la industria química pueden incluir redes de distribución cerradas, debido a la naturaleza especializada de sus operaciones.
Industrial, commercial or shared services sites such as train station buildings, airports, hospitals, large camping sites with integrated facilities or chemical industry sites can include closed distribution systems because of the specialised nature of their operations.