5.1.2

Internal fire mains may be of two types:

- rising mains, serving floors above ground or access level; or

- falling mains serving levels below ground or access level.

Internal fire mains may also be of the "dry" type which are normally empty and are supplied through hose from a fire service pumping appliance, or they may be of the "wet" type kept full of water and supplied from tanks and pumps in the building.

Internal fire mains should be provided in all buildings where a firefighting shaft is also required (see 5.3). The following provisions are required for the situations as described:

(a) in buildings with a floor at more than 20 m above ground level, storeys above ground level should be equipped with wet or dry rising fire mains;

(b) in buildings with a basement at more than 10 m below ground level, basement storeys should be equipped with wet or dry fire mains;

(c) in buildings with any floor at more than 60 m above ground level, storeys above ground level should be equipped with wet rising fire mains.

Provision of Internal Fire Mains