Temperature Derating Factors for AS/NZS

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Temperature derating factors for AS/NZS 3008.1.1 Edition 2009.

Air Temperature Derating Factors

Derating factors for ambient air temperatures other than 40oC.

oC Air Temperature Derating Factor
PVC 75oC EPR / XLPE 90oC High Temperature EPR 140oC
10 - - -
15 1.35 1.26 1.11
20 1.28 1.2 1.09
25 1.21 1.15 1.07
30 1.14 1.1 1.04
35 1.07 1.05 1.02
40 1 1 1
45 0.91 0.94 0.98
50 0.82 0.88 0.95
55 0.72 0.81 0.93
60 0.6 0.73 0.9
65 0.49 0.65 0.88
70 0.37 0.57 0.85
75 0.47 0.83
80 0.34 0.8
85 0.19 0.77
90 0.74
100 0.69
110 0.6
120 0.52
130 0.43
140 0.3

The usage of High Temperature EPR cables in ambient temperature above 40oC.

Ground Temperature Derating Factors

Derating factors for ambient air temperatures other than 25oC.

oC Ground Temperature Derating Factor
PVC 75oC EPR / XLPE 90oC
10 1.13 1.08
15 1.09 1.06
20 1.04 1.03
25 1 1
30 0.96 0.97
35 0.91 0.94
40 0.85 0.91

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