To comply with the EMC requirements of the CE mark, use one of the preferred cable types.
See Preferred power cable types (page 71).
Symmetrical shielded cable reduces electromagnetic emission of the whole drive system
as well as the stress on motor insulation, bearing currents and wear.
Metal conduit reduces electromagnetic emission of the whole drive system.
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 of the protective conductor 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
S
p
(mm
2
)
Cross-sectional area of the phase conductors
S (mm
2
)
S
1)
,
2)
S ≤ 16
1616 < S ≤ 35
S/235 < S
1)
Drive safety standard IEC/EN 61800-5-1:
• use a protective earth conductor with a cross-section of at least 10 mm
2
(8 AWG) Cu or 16 mm
2
(6 AWG) Al, or
• use a second protective earth conductor of the same cross-sectional area as the original protective earthing conductor,
or
• use a device which automatically disconnects the supply if the protective earth conductor breaks.
2)
Drive safety standard IEC/EN 61800-5-1: If the protective earth conductor is separate (ie, it does not form part of the input
power cable or the input power cable enclosure), the cross section must be at least:
• 2.5 mm
2
(14 AWG) when the conductor is mechanically protected, or
• 4 mm
2
(12 AWG) when the conductor is not mechanically protected.
￭ Typical power cable sizes
See the technical data of the drive (or unit).
70 Guidelines for planning the electrical installation
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