ABB ACS880-37LC-0390A-7, Hardware Manual, Page: 82 / 242

cross-sectional area of the protective earth conductor must 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 earth conductor
S
p
(mm
2
)
Cross-sectional area of the phase conductors
S (mm
2
)
S
1)
S ≤ 16
16 16 < S ≤ 35
S/2 35 < S
1) For the minimum conductor size in IEC installations, refer to
Additional grounding requirements – IEC .
If the protective earth conductor is not part of the input power cable or input power cable
enclosure, the minimum permitted cross-sectional area is:
• 2.5 mm
2
if the conductor is mechanically protected,
or
• 4 mm
2
if the conductor is not mechanically protected. If the equipment is cord-connected,
the protective earth conductor must be the last conductor to be interrupted if there is a
failure in the strain relief mechanism.
￭
Additional grounding requirements – IEC
This section gives grounding requirements according to standard IEC/EN 61800-5-1.
Because the normal touch current of the drive is more than 3.5 mA AC or 10 mA DC:
• the minimum size of the protective earth conductor must comply with the local safety
regulations for high protective earth conductor current equipment, and
• you must use one of these connection methods:
1. a fixed connection and:
• a protective earth conductor with a minimum cross-sectional area of 10 mm
2
Cu or 16 mm
2
Al (as an alternative when aluminum cables are permitted),
or
• a second protective earth conductor of the same cross-sectional area as the
original protective earth conductor,
or
• a device that automatically disconnects the supply if the protective earth
conductor is damaged.
2. a connection with an industrial connector according to IEC 60309 and a minimum
protective earth conductor cross-section of 2.5 mm
2
as part of a multi-conductor
power cable. Sufficient strain relief must be provided.
If the protective earth conductor is routed through a plug and socket, or similar means of
disconnection, it must not be possible to disconnect it unless power is simultaneously
removed.
Note: You can use power cable shields as grounding conductors only when their conductivity
is sufficient.
￭
Additional grounding requirements – UL (NEC)
This section gives grounding requirements according to standard UL 61800-5-1.
82 Guidelines for planning the electrical installation