FED-STD-228A
TABLE I.
Temperature
Correction factor
°F
°C
Types R, Types T, Type RH
RW
TW
50
10.0
0.60
0.79
0.73
51
10.6
0.63
0.81
0.76
52
11.1
0.67
0.82
0.78
53
11.7
0.71
0.84
0.80
54
12.2
0.75
0.86
0.83
55
12.8
0.79
0.88
0.86
56
13.3
0.82
0.90
0.88
57
13.9
0.86
0.92
0.91
58
14.4
0.90
0.95
0.94
59
15.0
0.95
0.97
0.97
60
15.6
1.00
1.00
1.00
61
16.1
1.05
1.03
1.03
62
16.7
1.10
1.06
1.07
63
17.2
1.16
1.10
1.10
64
17.8
1.22
1.14
1.13
65
18.3
1.28
1.19
1.17
66
18.9
1.34
1.23
1.20
67
19.4
1.41
1.27
1.24
68
20.0
1.48
1.33
1.28
69
20.6
1.55
1.39
1.32
70
21.1
1.63
1.46
1.36
71
21.7
1.71
1.55
1.40
72
22.2
1.80
1.67
1.45
73
22.8
1.89
1.78
1.50
74
23.3
1.98
1.91
1.55
75
23.9
2.08
2.06
1.59
76
24.4
2.18
2.23
1.64
77
25.0
2.29
2.39
1.69
78
25.6
2.40
2.56
1.75
79
26.1
2.52
2.75
1.80
80
26.7
2.65
2.93
1.86
5.1.2 Unless otherwise specified in the detail specification or specification sheet, the temperature
correction factor shall be as shown in table I. If the measurement is made at a temperature other than
15.6°C, the manufacturer shall correct the measured value of insulation resistance to the resistance at
15.6°C. If the insulation resistance is equal to or greater than that required when the measurement is
made at a temperature greater than 15.6°C, no correction factor need be employed. The manufacturer
shall demonstrate that the correction factor is accurate for his compound.
5.2 Unless otherwise specified in the detail specification or specification sheet, the entire delivery of the
wire or cable shall be tested.
5.3 The insulation resistance in megohms per 1,000 feet shall be recorded to the nearest 10 percent.
5.4 The test voltage and time of application shall be recorded.
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