Temperature Derating Factors

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Following values are applicable for the standards IEC 60364-5-52, BS 7671 and NF C 15-100.

Ambient Temperature

Derating factors for ambient air temperatures other than 30oC.

oC Ambient Temperature Derating Factor
PVC EPR / XLPE
10 1.22 1.15
15 1.17 1.12
20 1.12 1.08
25 1.06 1.04
30 1 1
35 0.94 0.96
40 0.87 0.91
45 0.79 0.87
50 0.71 0.82
55 0.61 0.76
60 0.5 0.71
65 0.65
70 0.58
75 0.5
80 0.41
85
90
95

Soil Temperature

Derating factors for soil temperatures other than 20oC.

oC Soil Temperature Derating Factor
PVC EPR / XLPE
10 1.1 1.07
15 1.05 1.04
20 1 1
25 0.95 0.96
30 0.89 0.93
35 0.84 0.89
40 0.77 0.85
45 0.71 0.8
50 0.63 0.76
55 0.55 0.71
60 0.45 0.65
65 0.6
70 0.53
75 0.46
80 0.38

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