38 Planning the electrical installation Additional US requirementsType MC continuous corrugated aluminium armor cable with symmetrical grounds orshielded power cable is recommended for the motor cables if metallic conduit is notused.The power cables must be rated for 75 °C (167 °F).ConduitWhere conduits must be coupled together, bridge the joint with a ground conductorbonded to the conduit on each side of the joint. Bond the conduits also to the driveenclosure. Use separate conduits for input power, motor and control wiring. Do notrun motor wiring from more than one drive in the same conduit.Armored cable / shielded power cableSix-conductor (three phases and three ground) type MC continuous corrugatedaluminium armor cable with symmetrical grounds is available from the followingsuppliers (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 rulesAll 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 NKCables) for analog signals. Employ one individually shielded pair for each signal. Donot use common return for different analog signals.
