Technical Booklet E Fire Safety·Page 166·6.9
Fire main location and outlets
Fire mains should be located in firefighting lobbies with outlet connections and valves at every level except fire and rescue access level. In Purpose Group 1(a) buildings without firefighting lobbies, the fire main should be in the firefighting stairway.
The fire main should be located in the firefighting lobbies of the firefighting shaft and should have an outlet connection and valve at every level other than at fire and rescue access level. However, where firefighting lobbies are not provided in a Purpose Group 1(a) building the fire main should be located in the firefighting stairway.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet E - Fire Safety.pdf