22 ACS550-02/U2 User’s Manual
Planning the electrical installation
concentric layer of copper wires. The better and tighter the shield, the lower the
emission level and bearing current.
Additional US requirements
Type MC continuous corrugated aluminum armor cable with symmetrical grounds or
shielded power cable must be used 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. For drives rated over 100 amperes, the power cables must be rated for 75
°C
(167
°F).
Conduit
Where conduits must be coupled together, bridge the joint with a ground conductor
bonded to the conduit on each side of the joint. Bond the conduits also to the drive
enclosure. Use separate conduits for input power, motor and control wiring. Do not
run motor wiring from more than one drive in the same conduit.
Armored cable / shielded power cable
The motor cables can be run in the same cable tray as other 460 V power wiring.
Control and signal cables must not be run in the same tray as power cables. Six
conductor (3 phases and 3 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).
Shielded power cables are available from Belden, Lapp Kabel (ÖLFLEX) and Pirelli.
Insulation jacket
Copper wire screen
Cable core
Inner insulation
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