Factors For Converting Copper Resistance To 20˚C

Factors For Converting Copper Resistance to 20˚C @ 100% Conductivity (I.A.C.S.)
˚C FACTOR ˚C FACTOR ˚C FACTOR ˚C FACTOR ˚C FACTOR
0 1.0853                
1 1.0807 51 0.8914 101 0.7586 151 0.6602 201  
2 1.0761 52 0.8883 102 0.7563 152 0.6585 202  
3 1.0716 53 0.8852 103 0.7541 153 0.6568 203  
4 1.0671 54 0.8821 104 0.7518 154 0.6551 204  
5 1.0626 55 0.8791 105 0.7496 155 0.6534 205  
6 1.0582 56 0.8761 106 0.7474 156 0.6517 206  
7 1.0538 57 0.8731 107 0.7452 157 0.6501 207  
8 1.0495 58 0.8701 108 0.7431 158 0.6484 208  
9 1.0452 59 0.8671 109 0.7409 159 0.6468 209  
10 1.0409 60 0.8642 110 0.7388 160 0.6451 210  
11 1.0367 61 0.8613 111 0.7366 161 0.6435 211  
12 1.0325 62 0.8583 112 0.7345 162 0.6419 212  
13 1.0283 63 0.8555 113 0.7324 163 0.6403 213  
14 1.0241 64 0.8526 114 0.7303 164 0.6386 214  
15 1.0200 65 0.8497 115 0.282 165 0.6370 215  
16 1.0160 66 0.8469 116 0.7261 166 0.6355 216  
17 1.0119 67 0.8441 117 0.7240 167 0.6339 217  
18 1.0079 68 0.8413 118 0.7220 168 0.6323 218  
19 1.0039 69 0.8386 119 0.7199 169 0.6307 219  
20 1.0000 70 0.8358 120 0.7179 170 0.6292 220  
21 0.9961 71 0.8331 121 0.7159 171 0.6276 221  
22 0.9922 72 0.8303 122 0.7139 172 0.6261 222  
23 0.9883 73 0.8276 123 0.7119 173 0.6245 223  
24 0.9845 74 0.8250 124 0.7099 174 0.6230 224  
25 0.9807 75 0.8223 125 0.7079 175 0.6215 225  
26 0.9770 76 0.8196 126 0.7060 176 0.6200 226  
27 0.9732 77 0.8170 127 0.7040 177   227  
28 0.9695 78 0.8144 128 0.7021 178   228  
29 0.9658 79 0.8118 129 0.7001 179   229  
30 0.9622 80 0.8092 130 0.6982 180   230  
31 0.9586 81 0.8067 131 0.6963 181   231  
32 0.9550 82 0.8041 132 0.6944 182   232  
33 0.9514 83 0.8016 133 0.6925 183   233  
34 0.9479 84 0.7991 134 0.6906 184   234  
35 0.9443 85 0.7966 135 06888 185   235  
36 0.9409 86 0.7941 136 0.6869 186   236  
37 0.9374 87 0.7916 137 0.6851 187   237  
38 0.9339 88 0.7891 138 0.6832 188   238  
39 0.9305 89 0.7867 139 0.6814 189   239  
40 0.9271 90 0.7843 140 0.6796 190   240  
41 0.9328 91 0.7819 141 0.6778 191   241  
42 0.9204 92 0.7795 142 0.6760 192   242  
43 0.9171 93 0.7771 143 0.6742 193   243  
44 0.9138 94 0.7747 144 0.6724 194   244  
45 0.9106 95 0.7724 145 0.6709 195   245  
46 0.9073 96 0.7700 146 0.6689 196   246  
47 0.9041 97 0.7677 147 0.6671 197   247  
48 0.9009 98 0.7654 148 0.6654 198   248  
49 0.8977 99 0.7631 149 0.6636 199   249  
50 0.8946 100 0.7608 150 0.6619 200   250  

Notes:

  1. National Committees may use minimum overall diameter requirements provided they are based on the minimum increases. The calculation is given in annex B.
  2. For intermediate nominal conductor diameters, the minimum increase figure corresponding to the next lagest nominal conductor diameter shall be taken.
  3. The dimensions of intermediate nominal conductor diameters for the R40 series are given in Annex A.

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