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
70 mm² < 184 A < 160 A < 145 A < 131 A < 112 A
95 mm² < 223 A < 194 A < 176 A < 158 A < 136 A
120 mm² < 259 A < 225 A < 205 A < 184 A < 158 A
Installation method F according table B.52.1.
Single-core cables, touching in free air
Clearance to wall not less than one cable diameter
Maximum allowed current in function of the ambient temperature for installation method F
Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
25 mm² < 110 A < 96 A < 87 A < 78 A < 67 A
35 mm² < 137 A < 119 A < 108 A < 97 A < 84 A
50 mm² < 167 A < 145 A < 132 A < 119 A < 102 A
70 mm² < 216 A < 188 A < 171 A < 153 A < 132 A
95 mm² < 264 A < 230 A < 209 A < 187 A < 161 A
120 mm² < 308 A < 268 A < 243 A < 219 A < 188 A
Calculation method for IEC:
• Single supply cables (3 phases + PE - configuration (1)):
• Add 10 % to the total compressor current (I
tot
Pack or I
tot
FF from the tables)
• Install the prescribed fuse on each cable
• Parallel supply cable (2 x 3 phases + PE - configuration (2)):
• Add 10 % to the total compressor current (I
tot
Pack or I
tot
FF from the tables) and divide by 2
• Multiply the ampacity of the cables with 0.8 (see table A.52.17 (52-E1))
• Install fuses of half the size of the recommended maximum fuse size on each cable.
• When using 2 x 3 phases + PE as in (3):
• Add 10 % to the total compressor current (I
tot
Pack or I
tot
FF from the tables) and divide by √3
• Multiply the ampacity of the cables with 0.8 (see table A.52.17 (52-E1))
• Fuse size: the recommended maximum fuse size divided by √3 on each cable.
• Size of the PE cable:
• For supply cables up to 35 mm²: same size as supply cables
Instruction book
122 2920 7109 23
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