9.2 Electric cable size and main 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 Dimension drawings.
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.
IEC versions
For IEC designed control panels, the below suggested cable sections are calculated according to
60364-5-52 (Electrical installations of buildings - selection and erection equipment - current-carrying
capacities in wiring systems).
Standard conditions refer to multi core copper cables with 70˚C PVC or 90 °C XLPE/EPR insulation in
cable conduits or cable trunking systems (installation method B2) at 30˚C ambient temperature and
operating at nominal voltage. The cables may not be grouped with other power circuits or cables.
Worst case conditions refer to:
• Ambient temperature > 30˚C (86 ˚F)
• Cables in closed raceway, conduit or trunking system (installation method B2) at 46 ˚C ambient
temperature
• Cables not grouped with other cables
Fuse calculations for IEC are done according to 60364-4-43 electrical installations of buildings, part 4:
protection for safety- section 43: protection against overcurrent. Fuse sizes are calculated in order to protect
the cable against short circuit. Fuse type aM is recommended but gG/gL is also allowed.
Instruction book
86 API603130
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