Planning the electrical installation
79
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. 1000 V AC cable is required above 500 V AC (below 600 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, brake resistors, 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
6-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, LAPPKABEL (ÖLFLEX) and
Pirelli, among others.
Selecting the control cables
General rules
All control cables must be shielded.
Use a double-shielded twisted pair cable (see figure a) for analogue signals. This
type of cable is recommended for the pulse encoder signals also. Employ one
individually shielded pair for each signal. Do not use common return for different
analogue signals.
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