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Instruction book
9
Technical data
9.1
Electric cable size and fuses
Important
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).
Maximum allowed current in function of the ambient temperature for installation method B2
Cable section
4 mm²
6 mm²
10 mm²
16 mm²
25 mm²
35 mm²
50 mm²
70 mm²
95 mm²
2920 7101 21
•
The voltage on the compressor terminals must not deviate more than 10% of the
nominal voltage.
It is however highly recommended to keep the voltage drop over the supply cables at
nominal current below 5% of the nominal voltage (IEC 60204-1).
•
If cables are grouped together with other power cables, it may be necessary to use
cables of a larger size than those calculated for the standard operating conditions.
•
Use the original cable entry. See section
To preserve the protection degree of the electric cubicle and to protect its
components from dust from the environment, it is mandatory to use a proper
cable gland when connecting the supply cable to the compressor.
•
Local regulations remain applicable if they are stricter than the values proposed below.
Installation method B2 according table B.52.1.
Multi-core cable in conduit on a wooden wall
Ambient temperature
30 °C
40 °C
< 27 A
< 23 A
< 34 A
< 30 A
< 46 A
< 40 A
< 62 A
< 54 A
< 80 A
< 70 A
< 99 A
< 86 A
< 118 A
< 103 A
< 149 A
< 130 A
< 179 A
< 156 A
Dimension
drawings.
45 °C
50 °C
< 21 A
< 19 A
< 27 A
< 24 A
< 36 A
< 33 A
< 49 A
< 44 A
< 63 A
< 57 A
< 78 A
< 70 A
< 93 A
< 84 A
< 118 A
< 106 A
< 141 A
< 127 A
55 °C
< 16 A
< 21 A
< 28 A
< 38 A
< 49 A
< 60 A
< 72 A
< 91 A
< 109 A
83
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