Detection and Prediction of Internal-Caused Fire in Tunnel Cable by an Equivalent Transient Thermal Circuit Model

Table 4

The maximum value of the increased calculation accuracy value relative to the front level layering.

Number of layers	Maximum value (°C)
	Insulation layer	Inner sheath	Outer sheath
5	5.23	3.1	2.7
10	1.81	1.36	1.15
20	0.7	0.54	0.51
30	0.2	0.16	0.16
50	0.1	0.11	0.1
100	0.01	0.021	0.021