b'Delta MW and EPS-FR Panel Awning and Patio Roof SystemFigure 4-8. Typical uncontrolled apartment fire (Alam and Beever 1996).4.7.1.3Design Fire 3: Fire Spread from the Site Boundary to the Class 10a Structure The fire source feature presented by the site boundary is taken as a radiating panel with transient temperature following the AS1530.4 standard fire time-temperature curve which increases to over 1050C. This provides a more conservative assessment than simply assessing a NCC H3V3 fire source (equivalent to C1V1 in NCC Volume 1) with a constant heat flux of 80 kW/m 2from the site boundary (which is equivalent to a radiating panel with a temperature of 817C). The standard fire curve is described by the equation: 8 =345 10 . 60+ 1 + 20 4.8Assessment 4.8.1DtS Base Case NCC does not restrict the combustibility of a Class 10a structure attached to a Class 1 structure if it is located more than 900 mm from the site boundary. As such, the risk of fire spread from, or to the site boundary is mitigated to a DtS accepted level of risk (i.e. to the degree necessary) with a spatial separation of 900 mm regardless of ventilation conditions.Revision 1-427'