MCC Maintenance Checklist

Use this MCC Maintenance Checklist for scheduled preventive maintenance inspection of motor control center enclosures, busbars, circuit breakers, contactors, overload relays, wiring, and controls.

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MCC Maintenance Checklist



Safety And Isolation

1. Lockout/tagout procedure has been applied and the MCC is confirmed de-energized and isolated before work begins.


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2. Stored energy (capacitors, control power transformers) has been discharged before hands-on inspection.


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3. All relevant permits to work are in place and signed off.


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4. Arc flash PPE appropriate to the incident energy level of the equipment is worn.


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5. MCC drawings, schedules, and previous maintenance records are available on site.


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Enclosure And General Condition

1. MCC enclosure is clean, dry, and free from dust, moisture, and contamination.


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2. No signs of water ingress, condensation, or rust are present inside the enclosure.


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3. Enclosure ventilation openings and cooling fans are unobstructed and operational.


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4. All enclosure doors open and close correctly with hinges and latches in good condition.


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5. Door seals and gaskets are intact and free from deterioration.


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6. No evidence of pests or insect activity is present inside the enclosure.


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7. All section labels, cubicle directories, and warning signs are present and legible.


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Busbars And Connections

1. Main busbars are free from discoloration, pitting, overheating marks, and corrosion.


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2. All busbar connections and splice joints are tight and torqued to the manufacturer's specification.


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3. Busbar insulation and barriers are undamaged and correctly fitted.


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4. Phase identification markings on busbars are present and correct.


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5. Earth busbar connections are tight and free from corrosion.


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Circuit Breakers And Fuses

1. All circuit breakers are correctly seated and latched in their positions.


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2. Circuit breaker handles and mechanisms operate smoothly without binding or stiffness.


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3. Trip settings on adjustable circuit breakers are verified against the protection schedule.


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4. Breaker contacts are free from excessive pitting, burning, or carbon deposits.


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5. All fuses are the correct type and rating as per drawings; no blown or discoloured fuses are present.


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6. Fuse holders and contacts are tight and free from overheating or corrosion.


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Contactors And Starters

1. Contactor contacts are inspected and show no excessive pitting, burning, or wear beyond acceptable limits.


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2. Contactor coils show no signs of overheating or physical damage.


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3. Contactor operation is verified (manual or electrical activation) and confirmed smooth without chattering.


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4. Starter enclosures are free from arc flash damage or carbon deposits.


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5. Any variable frequency drives (VFDs) are free from fault indicators and the cooling fan is operational.


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Overload Relays

1. Overload relay settings are verified against the motor nameplate full-load amperage for each circuit.


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2. Overload relay test function is operated and confirmed to trip correctly.


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3. Overload relays show no signs of overheating or physical damage.


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4. Reset buttons and modes (manual/automatic) are configured correctly per site requirements.


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Wiring And Terminations

1. All control and power wiring is undamaged, correctly routed, and free from chafing or abrasion.


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2. All terminal connections are tight and torqued to specification.


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3. Wiring is correctly labelled at both ends and matches the MCC drawings.


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4. No loose wire ends, missing terminal ferrules, or incorrectly terminated conductors are present.


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5. Insulation resistance tests are conducted on power circuits as per the maintenance schedule and results recorded.


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Controls, Metering, And Indication

1. All pilot lights and indicator lamps are operational.


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2. Ammeters, voltmeters, and power meters are functional and showing correct readings.


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3. Control switches and selector switches operate correctly through all positions.


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4. Remote control and BMS interface signals are verified as operational where applicable.


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5. PLC or intelligent relay software versions and parameter settings are backed up and recorded.


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Documentation And Reinstatement

1. All findings, test results, and torque records are documented on the service report or work order.


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2. MCC is re-energized in the correct sequence and confirmed operational.


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3. Any defects are logged with recommended corrective action and priority rating.


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4. Maintenance records are updated with the service date, engineer details, and next service due.


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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