Planning the electrical installation
48
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 VAC cable is accepted for up to 500 VAC.
1000 VAC cable is required above 500 VAC (below 600 VAC). 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. 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 or 600 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, LAPPKABEL (ÖLFLEX) and
Pirelli.
Power factor compensation capacitors
Do not connect power factor compensation capacitors or surge absorbers to the
motor cables between the drive and the motor. They are not designed to be used
with drives, and will degrade motor control accuracy. They can cause permanent
damage to the drive or themselves due to the rapid changes in the drive output
voltage.
To Next Page
Loading...
Need help?
General