Code of Practice for Fire Safety in Buildings - Vocabulary & Key Concepts

Comprehensive vocabulary flashcards covering regulatory definitions, means of escape, fire resisting construction, fire engineering principles, and evacuation timelines from the Code of Practice for Fire Safety in Buildings.

Access staircase

A staircase designed and constructed to allow firemen safe and unobstructed access to all storeys of a building in the event of fire.

Balcony approach

A balcony that serves as an external approach to a common staircase and serves two or more occupancies.

Basement

Any storey located below the lower or lowest ground storey from which any exit route is in an upward direction.

Bounding Conditions

A set of fire safety provisions that must be maintained as a result of a performance-based approach to fire safety design, which if altered will invalidate the performance-based design.

Compartment area

The area of the floors of a building contained within the external surfaces of a fire compartment.

Compartment volume

The volume of the portion of a building contained within the external surfaces of the walls and floors forming a fire compartment.

Cubical extent

The space contained within the external surfaces of the walls and roof of a building and the upper surface of the floor of its lowest storey, excluding spaces within roof enclosures used exclusively for water tanks, lift gear, or other services.

Deadend travel distance

The overall length of travel within an exit route before an alternative exit is available.

Discharge value

The number of persons that a staircase of a given width may be assumed to be capable of discharging from a given number of storeys.

Element of construction

Any floor, beam, column, or hanger; any loadbearing wall or member (other than roof members); or any required staircase including its landings and supports.

Emergency Vehicular Access (EVA)

A vehicular access designed and constructed to allow safe and unobstructed access and operation of Fire Services Department vehicles to a building in the event of a fire or other emergency.

Exit door

A door from a storey, flat, or room that provides direct access on to an exit route.

Exit route

The continuous path of travel from any part of a building to the ultimate place of safety, excluding revolving doors, lifts, and escalators.

Fire barrier

A construction having a specified fire resistance rating (FRR) that separates one space from another and may form part of a fire compartment.

Fire compartment

A space enclosed by fire barriers or appropriate construction on all sides so that fire will not spread out from the space or into an adjoining space.

Firefighting and rescue stairway

A specialized stairway enclosure that accommodates both an access staircase and a fireman's lift.

Fire resistance rating (FRR)

The period of time a building element is capable of resisting the action of fire across three standard performance criteria: stability ($X$), integrity ($Y$), and insulation ($Z$), expressed as $X/Y/Z$ in minutes.

Fireman's lift

A lift specifically designed, installed, and designated to be operated by firefighters during a fire incident.

Maisonette

A separate and self-contained flat (not being a tenement floor) comprising more than one but not more than three storeys.

Occupant capacity

The maximum number of persons that a room, storey, or fire compartment is calculated to accommodate based on specified occupancy factors.

Passive fire safety provisions

Permanent structural and architectural features—such as fire barriers, fire doors, spandrels, and non-combustible linings—that prevent fire development and flame/smoke spread without requiring activation.

Protected exit

A required staircase, ramp, or passageway completely enclosed by fire barriers that leads to an ultimate place of safety.

Protected lobby

A lobby constructed with fire and smoke resisting enclosures to prevent the penetration and spread of heat and smoke.

Refuge floor

A protected, naturally ventilated intermediate floor serving as a temporary safe assembly area for occupants of tall buildings during evacuation before reaching an ultimate place of safety.

Required staircase

An access staircase, whether inside a firefighting and rescue stairway or not, or any staircase required by code for occupant escape in case of fire.

Smoke seal

A flexible or intumescent sealing component installed around openings (doors, dampers, or penetrations) to inhibit the leakage and passage of smoke between adjoining spaces.

Special hazard

An area within a building presenting a high risk of fire ignition, rapid spread, or explosion (e.g., transformer rooms, boiler rooms, generator rooms, and dangerous goods stores) that requires enhanced separation.

Travel distance

The horizontal distance measured along the centerline of the exit route from the most remote point on a floor to the protected exit door, the first stair tread, or a final discharge point.

Ultimate place of safety

A street or open exterior space connected directly to a street, having a clear width of not less than $1.5\,\text{m}$ or the required exit route width, where evacuees can safely disperse clear of the effects of fire.

Usable floor area

The aggregate area of floors in a storey or building excluding staircases, public circulation spaces, lift landings, lavatories, and machinery spaces.

Ventilated staircase

A staircase where at least $50\%$ of its perimeter is open to the external air (at least $50\%$ on the long face and $25\%$ on other faces) to provide continuous natural cross-ventilation.

Temporary refuge space

A designated safe space of at least $1.5\,\text{m} \times 1.5\,\text{m}$ (or two spaces of $0.75\,\text{m} \times 1.5\,\text{m}$) provided in protected exits or fireman's lift lobbies where persons with a disability can await rescue.

Flashover

The rapid transition from a localized developing fire to full room involvement where all exposed combustible surfaces ignite simultaneously, typically associated with ceiling temperatures around $600\,^\circ\text{C}$ and floor radiation over $20\,\text{kW/m}^2$.

Available Safe Egress Time (ASET)

The calculated time interval between fire ignition and the point at which conditions inside the enclosure reach untenable limits for occupants.

Required Safe Egress Time (RSET)

The total time needed for occupants to safely evacuate to a place of safety, consisting of fire detection time, warning cue, pre-movement time, and physical travel time.

Pre-movement time

The period between the recognition of a fire alarm or warning cue and the moment occupants actually initiate movement toward an exit.

Design fire

An engineering characterization of an idealized fire's development over time, specified as a curve of heat release rate (HRR) versus time, used as the test load in fire engineering assessments.

Spandrel

A vertical fire-resisting wall element of at least $900\,\text{mm}$ in height (or an equivalent $500\,\text{mm}$ horizontal projection) installed between windows on successive storeys to impede external vertical fire spread.

Phases of Fire Development Curve

The chronological progression of an enclosure fire through five stages: Incipient phase, Growth phase ($t^2$ development), Flashover transition, Fully Developed phase, and Decay phase.

Timeline Assessment (ASET vs. RSET)

A fire safety engineering evaluation method comparing Available Safe Egress Time (ASET) to Required Safe Egress Time (RSET) to ensure an adequate safety margin exists before tenability limits are reached.

Vertical Barrier at Opening

A non-combustible downstand barrier of at least $450\,\text{mm}$ hanging below the ceiling or floor slab around floor voids and escalators to trap a buoyant hot smoke layer and trigger sprinkler activation.