Demands for maintenance according to the NEN norm
All buildings taller than 20 metres must have a dry riser and connection points within 50 metres of any point in the building. Very large buildings may therefore have multiple dry risers, each with its own inlet breeching and multiple connection points.
A standard dry riser should have the following parts:
- CC connector: on every hydrant valve;
- J connector: on the breeching inlet;
- Landing valve: at every connection point;
- Wall cabinet: to protect the J connector