26 September 2006
APPENDIX B OCCUPANCY HAZARD CLASSIFICATION FOR DETERMINING
AUTOMATIC SPRINKLER DENSITIES AND HOSE STREAM DEMANDS
CLASSIFICATION OF OCCUPANCIES.
The principal occupancy classifications are light hazard, ordinary hazard, and
extra hazard. Listed below are the classifications with examples of common
occupancies listed under each. The basic hazard classification of an occupancy
does not define the fire hazard present in all areas of that occupancy. If more
hazardous processes or areas exist within a given occupancy, protect these
areas in accordance with the fire protection requirements pertaining to the hazard
classification of that area. Determine the classification for unlisted occupancies
from the definitions or by comparison with one of the listed occupancies.
Light Hazard Occupancies.
Occupancies or portions of occupancies where the quantity and combustibility of
the contents are low and fires with relatively low rates of heat release are
expected. Small, scattered amounts of flammable liquids in closed containers
are allowable in quantities not exceeding 20 L (5 gal) per fire area. This
classification includes but is not limited to the following occupancies:
Churches and chapels
Clinics (dental, outpatient, patient areas only)
Data processing areas
Dispensaries (patient areas only)
Drill halls (not used for storage or exhibition)
Child development centers
Ordinary Hazard Group 1 Occupancies.
Occupancies or portions of occupancies where combustibility is low, quantity of
combustibles is moderate, stockpiles of combustibles do not exceed 2.5 m (8 ft),
and fires with moderate rates of heat release are expected. Modest, scattered