Residual Current Device (Rcd) Protection - Danfoss iC2-Micro Series Design Manual

Design Guide | iC2-Micro Frequency Converters
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.
Ensure reinforced protective earthing conductor according to IEC 60364-5-54 cl. 543.7 or according to
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local safety regulations for high touch current equipment. The reinforced protective earthing of the drive
can be done with:
a PE conductor with a cross-section of at least 10 mm
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an extra PE conductor of the same cross-sectional area as the original PE conductor as specified by IEC
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60364-5-54 with a minimum cross-sectional area of 2.5 mm
(12 AWG) (not mechanically protected).
a PE conductor completely enclosed with an enclosure or otherwise protected throughout its length
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against mechanical damage.
a PE conductor part of a multi-conductor power cable with a minimum PE conductor cross-section of 2.5
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mm
power cable shall be installed with an appropriate strain relief).
NOTE: In IEC/EN 60364-5-54 cl. 543.7 and some application standards (for example IEC/EN 60204-1), the
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limit for requiring reinforced protective earthing conductor is 10 mA leakage current.
LEAKAGE CURRENT HAZARD
Leakage currents can exceed 5%. Failure to ground the drive properly can result in death or serious injury.
Ensure that the minimum size of the ground conductor complies with the local safety regulations for high touch current
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equipment.
Protective earth (PE) and equipotential bonding are usually connected to one another so that equipotential bonding currents are also
distributed over the entire PE system.
PE currents and their impact on the system can be avoided or reduced by using short motor cables, symmetrical cables (especially for
current ratings > 50 A), or shielded cables with low capacitance between conductors and PE.

Residual Current Device (RCD) Protection

7.3.4
Residual current devices (RCD) may be used to provide additional protection against electrical shock and fire hazards due to fault
currents because of insulation faults or high leakage currents. Additional consideration is needed when RCDs are used in front of the
drive. RCDs must always be installed according to local regulations.
ELECTRICAL SHOCK AND FIRE HAZARD – RCD COMPLIANCE
The drive can cause a DC fault current in the PE conductor. Failure to use a Type B residual current-operated
protective device (RCD) can lead to the RCD not providing the intended protection and therefore can result in
death, fire, or other serious hazard.
When an RCD is used for protection against electrical shock or against fire, only a Type B device is allowed
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on the supply side.
78 | Danfoss A/S © 2024.08
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(14 AWG) (permanently connected or pluggable by an industrial connector. The multi-conductor
WARNING
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(8 AWG) Cu or 16 mm
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(14 AWG) (mechanically protected) or 4 mm
WARNING
WARNING
Electrical Installation Considerations
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(6 AWG) Al.
AJ402315027937en-000401 / 130R1239
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