Design Guide | iC2-Micro Frequency Converters Electrical Installation Considerations
7.4.2 Power Cables and Grounding
Depending on the installation and the required EMC compliance level, using shielded cables is required for motor, brake, and DC
connections. Alternatively, unshielded cables within a metal conduit can also be used.
If a shielded cable is used, it is important to connect the shield through a 360° connection. Connect the shield with the supplied clamps,
and avoid pigtails, as they limit the shielding functionality.
Figure 40: Installation of Cable Shield
NOTICE
SHIELDED CABLES
If shielded cables or metal conduits are not used, the unit and the installation do not meet regulatory limits.
If a non-shielded wire is used to connect a brake resistor, it is recommended to twist the wires to reduce the electric noise.
Ensure that the cables are as short as possible to reduce interference level from the entire system and minimize losses.
WARNING
ELECTRICAL SHOCK HAZARD - LEAKAGE CURRENT HAZARD >3.5 MA
Leakage currents exceed 3.5 mA. Failure to connect the drive properly to protective earth (PE) can result in
death or serious injury.
l Ensure reinforced protective earthing conductor according to IEC 60364-5-54 cl. 543.7 or according to
local safety regulations for high touch current equipment. The reinforced protective earthing of the drive
can be done with:
l a PE conductor with a cross-section of at least 10 mm
2
(8 AWG) Cu or 16 mm
2
(6 AWG) Al.
l an extra PE conductor of the same cross-sectional area as the original PE conductor as specified by IEC
60364-5-54 with a minimum cross-sectional area of 2.5 mm
2
(14 AWG) (mechanically protected) or 4 mm
2
(12 AWG) (not mechanically protected).
l a PE conductor completely enclosed with an enclosure or otherwise protected throughout its length
against mechanical damage.
l a PE conductor part of a multi-conductor power cable with a minimum PE conductor cross-section of 2.5
mm
2
(14 AWG) (permanently connected or pluggable by an industrial connector. The multi-conductor
power cable shall be installed with an appropriate strain relief).
l NOTE: In IEC/EN 60364-5-54 cl. 543.7 and some application standards (for example IEC/EN 60204-1), the
limit for requiring reinforced protective earthing conductor is 10 mA leakage current.
Danfoss A/S © 2024.08 AJ402315027937en-000401 / 130R1239 | 81
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