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Maryland Metrics: Technical Bulletin
Maximum currents for copper wires
 

Maximum continuous thermal current Io in copper wire according to the Greek Electrical Installations Regulation. (paragraph 126)
These values stand for 30oC ambient temperatures and 60oC Wire temperatures , and they can be corrected using the values in table 2.

Section  mm2 Cat  I Cat  II Cat  III
Imax Ifuse Imax Ifuse Imax Ifuse
0,75 9 6 15 10 7 6
1 11 6 18 16 9 6
1,5 14 10 22 20 10 6
2,5 20 16 31 25 15 10
4 25 20 41 35 20 16
6 33 25 54 50 26 20
10 43 35 70 60 35 25
16 60 50 96 80 48 35
25 83 60 128 100 65 50
35 100 80 153 125 78 60
50 127 100 197 160 100 80
70 147 125 234 200 - -
95 181 160 287 250 - -
120 208 200 336 300 - -
150 238 225 383 355 - -
185 266 250 435 425 - -
240 - - 515 500 - -
300 - - 596 600 - -
400 - - 710 710 - -
500 - - 810 800 - -

     Table  2. (Temperature correction factors).

Amb. temp 30 35 40 45 50 55
Factor 1,00 0,91 0,82 0,71 0,58 0,41

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