PT-100 Manual

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Installation
Table 2-2, Allowable Conductor Ampacities
The table below shows the allowable ampacities of insulated copper conductors rated 0
through 2000 volts, 60°C through 90°C, not more than three current-carrying conductors in
a raceway, cable, or earth (directly buried), based on ambient temperature of 30°C (86°F).
Conductor Size
(AWG)
Ampacity for Temperature Rating Copper Conductor
60°C (140°F) 75°C (167°F) 90°C (194°F)
14* 15 20 25
12* 20 25 30
10* 30 35 40
8 405055
6 556575
4 708595
3 85 100 115
2 95 115 130
1 110 130 145
Data taken from Table 310.15(B)(16) in the National Electrical Code® (2014 Edition)
* Per
NEC® (2014 Edition), Section 240.4(D) for conductor overcurrent protection limitations. The
overcurrent protection of these copper conductors after any correction factors have been applied
for ambient temperature or number of conductors are limited to the following ratings: 14 AWG -
15A, 12 AWG - 20A, 10 AWG - 30A.
Table 2-3, Ambient Temperature Adjustments
Conductor ampacities must be derated when in ambient temperatures greater than
30°C (86°F). Find the allowable ampacities specifi ed in the ampacity tables (from
Table 2-2) and multiply by the appropriate correction factor shown below.
Ambient Temperature Temperature Rating of Conductor
(°C) (°F) 60°C (140°F) 75°C (167°F) 90°C (194°F)
10 or less 50 or less 1.29 1.20 1.15
11–15 51 - 59 1.22 1.15 1.12
16 -20 60 - 68 1.15 1.11 1.08
21 - 25 69 - 77 1.08 1.05 1.04
26 - 30 78 - 86 1.00 1.00 1.00
31 - 35 87 - 95 0.91 0.94 0.96
36 - 40 96 - 104 0.82 0.88 0.91
41 - 45 105 - 113 0.71 0.82 0.87
46 - 50 114 - 122 0.58 0.75 0.82
51 - 55 123 - 131 0.41 0.67 0.76
56 - 60 132 - 140 - 0.58 0.71
61 - 65 141 - 149 - 0.47 0.65
66 - 70 150 - 158 - 0.33 0.58
71 - 75 159- 167 - - 0.50
76 - 80 168 - 176 - - 0.41
81 - 85 177 - 185 - - 0.29
Data taken from Table 310.15(B)(2)(a) in the National Electrical Code® (2014 Edition)