Cable sizing according IEC
The tables below indicate the current carrying capacities of cables for 3 commonly used
installation methods, calculated according to standard 60364-5-52 - electrical installations of
buildings part 5 - selection and erection equipment and section 52 - current carrying capacities in
wiring systems.
The allowed currents are valid for PVC insulated cables with three loaded copper conductors
(maximum conductor temperature 70 °C).
Installation method B2 according table B.52.1.
Multi-core cable in conduit on a wooden wall
Maximum allowed current in function of the ambient temperature for installation method B2
Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
4 mm² < 27 A < 23 A < 21 A < 19 A < 16 A
6 mm² < 34 A < 30 A < 27 A < 24 A < 21 A
10 mm² < 46 A < 40 A < 36 A < 33 A < 28 A
16 mm² < 62 A < 54 A < 49 A < 44 A < 38 A
25 mm² < 80 A < 70 A < 63 A < 57 A < 49 A
35 mm² < 99 A < 86 A < 78 A < 70 A < 60 A
50 mm² < 118 A < 103 A < 93 A < 84 A < 72 A
70 mm² < 149 A < 130 A < 118 A < 106 A < 91 A
95 mm² < 179 A < 156 A < 141 A < 127 A < 109 A
120 mm² < 206 A < 179 A < 163 A < 146 A < 126 A
Installation method C according table B.52.1.
Single-core or multi-core cable on a wooden wall
Maximum allowed current in function of the ambient temperature for installation method C
Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
4 mm² < 32 A < 28 A < 25 A < 23 A < 20 A
6 mm² < 41 A < 36 A < 32 A < 29 A < 25 A
10 mm² < 57 A < 50 A < 45 A < 40 A < 35 A
16 mm² < 76 A < 66 A < 60 A < 54 A < 46 A
25 mm² < 96 A < 84 A < 76 A < 68 A < 59 A
35 mm² < 119 A < 104 A < 94 A < 84 A < 73 A
50 mm² < 144 A < 125 A < 114 A < 102 A < 88 A
Instruction book
132 2920 7118 31
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