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Model 6 Motor Control Centers 80459-641-01E
Section 6—Maintaining the MCC 10/2012
© 1999–2012 Schneider Electric All Rights Reserved 56
ENGLISH
6. Verify that all main lug, circuit breaker, or fusible switch set screws
holding incoming conductors in main lugs are in place and properly
tightened (see Figure 70). Use a torque wrench and a 3/8 in. allen bit to
torque the lug set screws to the appropriate value (see “Cable
Connection Torque Values” on 51).
7. Inspect all insulators, braces, and barriers; replace any that show signs
of arcing damage, tracking, excessive heat, or cracking.
Maintaining the Control Unit
Perform maintenance on control units at least annually, or more frequently if
indicated by service conditions and your established maintenance policy.
During installation, locate and tighten any connections that have become
loose during shipment and handling, using the following procedures. If the
control unit (see Figure 71) is being removed from the MCC for
maintenance, start with “Removing the Control Unit” beginning on page 57.
If maintenance is performed with the control unit installed, start with “Circuit
Breaker or Disconnect Switch” on page 63.
Figure 70: Main Lug Compartment Torque
Connection
Figure 71: Control Unit
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• This equipment must only be installed and serviced by qualified
electrical personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to confirm power is
off.
• Replace all devices, doors, and covers before turning on power to this
equipment.
Failure to follow this instruction will result in death or serious injury.