ABB ACS880-37LC, Руководство по оборудованию

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If the cabling is in a metal conduit, it reduces the 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
16 16 < S ≤ 35
S/2 35 < 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).
Guidelines for planning the electrical installation 63