108.423—Fire hydrants and associated equipment.
(a)
A fire main system must have enough fire hydrants so that each accessible space may be sprayed with at least two spray patterns of water.
(b)
In a main machinery space, except a shaft alley with no assigned space for stowage of combustibles, each spray pattern of water must be from one length of fire hose and each must be from a separate outlet. In all other spaces at least one spray pattern of water must be from one length of fire hose.