Planning the electrical installation 75
concentric layer of copper wires with an open helix of copper tape or copper wire. The
better and tighter the shield, the lower the emission level and bearing currents.
Additional US requirements
Use type MC continuous corrugated aluminum armor cable with symmetrical grounds
or shielded power cable for the motor cables if metallic conduit is not used. For the
North American market, 600 V AC cable is accepted for up to 500 V AC. 1000 V AC
cable is required above 500 V AC (below 600 V AC). Power cables must be rated for
75
°C (167 °F) or higher.
Conduit
Couple separate parts of a conduit together: bridge the joints with a ground conductor
bonded to the conduit on each side of the joint. Also bond the conduits to the drive
enclosure and motor frame. Use separate conduits for input power, motor, brake
resistor, and control wiring. When conduit is employed, type MC continuous
corrugated aluminum armor cable or shielded cable is not required. A dedicated
ground cable is always required.
Note: Do not run motor wiring from more than one drive in the same conduit.
Armored cable / shielded power cable
Six-conductor (three phases and three ground) type MC continuous corrugated
aluminum armor cable with symmetrical grounds is available from the following
suppliers (trade names in parentheses):
• Anixter Wire & Cable (Philsheath)
• BICC General Corp (Philsheath)
• Rockbestos Co. (Gardex)
• Oaknite (CLX).
1 Insulation jacket
2 Helix of copper tape or copper wire
3 Copper wire screen
4 Inner insulation
5 Cable core
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