Use symmetrical shielded motor cable. Ground motor cable shields 360° at both ends. Keep
the motor cable and its PE pigtail (twisted shield) as short as possible to reduce
high-frequency electromagnetic emissions.
Note: When continuous metal conduit is employed, shielded cable is not required. The
conduit must have bonding at both ends.
The protective conductor must always have an adequate conductivity. Unless local wiring
regulations state otherwise, the cross-sectional area of the protective conductor must agree
with the conditions that require automatic disconnection of the supply required in 411.3.2.
of IEC 60364-4-41:2005 and be capable of withstanding the prospective fault current during
the disconnection time of the protective device. The cross-sectional area of the protective
conductor can either be selected from the table below or calculated according to 543.1 of
IEC 60364-5-54.
This table shows the minimum cross-sectional area related to the phase conductor size
according to IEC 61800-5-1 when the phase conductor and the protective conductor are
made of the same metal. If this is not so, the cross-sectional area of the protective earthing
conductor shall be determined in a manner which produces a conductance equivalent to
that which results from the application of this table.
Minimum cross-sectional area of the corresponding
protective conductor
Sp (mm
2
)
Cross-sectional area of the phase conductors
S (mm
2
)
SS ≤ 16
1616 < S ≤ 35
S/235 < S
￭ Typical power cable sizes
See chapter Technical data for the typical power cable sizes for each drive type.
￭ Alternative power cable types
Recommended power cable types
This section presents the recommended cable types. Check with local / state / country
electrical codes for allowance.
72 Guidelines for planning the electrical installation
To Next Page
Loading...
