Fire hydrant, hose reel, sprinkler and drencher services downstream of the backflow device use materials within the Section 2 limits and the relevant fire standard, are installed to Section 5 and the fire system standard, have backflow prevention under Section 4, and hose reels in high hazard areas get backflow protection matched to the hazard (2003 text).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.