9
Technical data
9.1
Electric cable size and fuses
Important
•
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.
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
Instruction book
2920 7101 21
83
Summary of Contents for QGS 40
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