74 Planning the electrical installation
Alternative power cable types
The recommended and the not allowed power cable types to be used with the drive
are presented below.
Recommended power cable types
Power cable types for limited use
Not allowed power cable types
Motor cable shield
If the motor cable shield is used as the sole protective earth conductor of the motor,
make sure that the conductivity of the shield is sufficient. See section General rules
on page 72, or IEC 61800-5-1.
To effectively suppress radiated and conducted radio-frequency emissions, the cable
shield conductivity must be at least 1/10 of the phase conductor conductivity. The
requirements are easily met with a copper or aluminum shield. The minimum
requirement of the motor cable shield of the drive is shown below. It consists of a
Symmetrical shielded cable with three phase conductors and a
concentric PE conductor as the shield. The shield must meet the
requirements of IEC 61800-5-1, see page 72. Check with
local/state/country electrical codes for allowance.
Symmetrical shielded cable with three phase conductors and a
concentric PE conductor as the shield. A separate PE conductor is
required if the shield does not meet the requirements of IEC 61800-5-1,
see page 72.
Symmetrical shielded cable with three phase conductors and
symmetrically constructed PE conductor, and a shield. The PE conductor
must meet the requirements of IEC 61800-5-1, see page 72.
A four-conductor system (three phase conductors and a protective
conductor on a cable tray) is not allowed for motor cabling (it is
allowed for input cabling).
Symmetrical shielded cable with individual shields for each phase
conductor is not allowed on any cable size for input or motor cabling.
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