ABB ACQ550-U1-011A-6, User Manual

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ACQ550-U1 User’s Manual 283
Technical data
Motor cable requirements for CE & C-Tick compliance
The requirements in this section apply for CE or C-Tick compliance.
Minimum requirement (CE & C-Tick)
The motor cable must be a symmetrical three conductor cable with a concentric PE
conductor or a four conductor cable with a concentric shield, however, a symmetrical
constructed PE conductor is always recommended. The following figure shows the
minimum requirement for the motor cable shield (for example, MCMK, Draka NK
Cables).
Recommendation for conductor layout
The following figure compares conductor layout features in motor cables.
Insulation jacket Copper wire shield
Cable core
Inner insulation
Symmetrical shielded cable: three phase
conductors and a concentric or otherwise
symmetrically constructed PE conductor, and a
shield
Recommended (CE & C-Tick)
PE
conductor
and shield
A separate PE conductor is required if the
conductivity of the cable shield is < 50% of the
conductivity of the phase conductor.
Not allowed for motor cables (CE & C-Tick)
Shield
PE
PE
Allowed for motor cables with phase
conductor cross section up to 10 mm
2
.
A four-conductor system: three phase
conductors and a protective conductor, without a
shield.
Allowed (CE & C-Tick)
Shield
Shield