40 Planning the electrical installation
Additional US requirements
Type MC continuous corrugated aluminium armor cable with symmetrical grounds or
shielded power cable is recommended for the motor cables if metallic conduit is not
used.
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. 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
aluminium 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 cable is available from the following suppliers:
•Belden
• LAPPKABEL (ÖLFLEX)
• Pirelli.
Selecting the control cables
General rules
All analog control cables and the cable used for the frequency input must be shielded.
Use a double-shielded twisted pair cable (Figure a, for example JAMAK by Draka NK
Cables) for analog signals. Employ one individually shielded pair for each signal. Do
not use common return for different analog signals.
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