MCC Maintenance Checklist for Industrial Sites in South Africa
What to check before, during and after your next planned shutdown
Your motor control centre (MCC) usually gets attention when something has already gone wrong. A pump will not start. A conveyor trips again. A VSD shows another fault. Someone smells heat near a panel. Production is waiting, maintenance is under pressure, and the shutdown window you planned suddenly feels too short. That is why MCC maintenance should be part of your planned electrical maintenance schedule, not something you only deal with after a breakdown.
Your MCC controls and protects the motors your site depends on every day. If it is dirty, overloaded, poorly ventilated, badly labelled, full of loose connections or running with ageing components, the problem will eventually show up somewhere in your plant.
At CAW Electrical, we inspect, maintain, repair, refurbish and retrofit MCCs, VSDs, switchgear and industrial electrical systems. We also work on the motors, pumps, alternators and generators connected to those systems, which means we understand the full failure path, not only the panel. CAW Electrical’s capabilities include VSD installation and maintenance, MCC and switchgear installations, MV cable joints and terminations, MV switchgear maintenance and repairs up to 33kV, low-voltage installations, compliance audits, CoC issuing, and infra-red thermal imaging reports.
This guide gives you a practical MCC maintenance checklist for industrial sites in South Africa, with clear steps for planning, inspection, shutdown work and reporting.
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Key takeaways
- A motor control centre, or MCC, is one of the most important electrical control points on an industrial site. It houses the equipment that starts, stops, protects and controls motors used for pumps, fans, conveyors, compressors, mixers and other production-critical assets.
- MCC maintenance should include both energised checks, such as thermal imaging under load, and de-energised inspections during a safe planned shutdown.
- Your checklist should cover the MCC room, ventilation, busbars, breakers, contactors, overloads, VSDs, soft starters, control wiring, earthing, labelling, cleanliness, testing and final reporting.
- The most useful maintenance report does more than confirm that the MCC was checked. It should tell you what was found, what was repaired, what remains a risk, what spares are needed, and what should be planned before the next shutdown.
What is an MCC?
An MCC, or motor control centre, is an electrical assembly used to control and protect multiple electric motors from one central point.
Depending on your site, an MCC may include:
- Main incoming breakers
- Busbars
- Motor starters
- Contactors
- Overload relays
- Fuses
- Circuit breakers
- Soft starters
- Variable speed drives
- Control transformers
- Relays
- PLC or automation connections
- Terminal blocks
- Control wiring
- Indication lights
- Meters
- Earthing and bonding systems
In practical terms, your MCC is the link between your electrical supply and the motor-driven equipment that keeps your plant running.
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Why is MCC maintenance important?
A neglected MCC can cause downtime long before the motor itself fails. On a water treatment site, one unreliable starter can affect pump availability. In a mining or processing plant, a conveyor or slurry pump trip can hold up production. On a marine or harbour site, electrical faults can affect pumps, ventilation, alternators or other operational equipment. In a manufacturing plant, one MCC fault can stop a full line.
Poor MCC maintenance can lead to:
- Repeated motor trips
- Starter failure
- VSD faults
- Overheating
- Burnt terminals
- Loose or damaged wiring
- Poor control circuit reliability
- Nuisance breakdowns
- Production stoppages
- More emergency callouts
- Higher repair costs
- Increased electrical safety risk
Low-voltage MCCs play a vital role in controlling motors and production processes, and preventive and predictive maintenance helps reduce the risk of failures and hazards.
What are the warning signs your MCC needs attention?
Do not wait for the next annual shutdown if your MCC is already showing signs of trouble.
Book an inspection with us if you notice:
- A burnt smell near the panel
- A warm panel door or unusual heat around vents
- Breakers tripping regularly
- Contactors chattering or humming
- Motors failing to start
- VSDs tripping repeatedly
- Soft starters showing repeated alarms
- Discoloured terminals, cables or insulation
- Flickering indication lights
- Dust or moisture inside the panel
- Corrosion on enclosures or gland plates
- Missing labels
- Damaged handles, locks or covers
- Temporary wiring that was never corrected
- Repeated production stoppages linked to the same motor circuit
These are early warnings. The sooner you investigate them, the better your chance of avoiding a breakdown during production.
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How often should MCC maintenance be done?
There is no single interval that suits every industrial site.
Your MCC maintenance schedule should be based on:
- The age of the MCC
- The environment it operates in
- The number of motor starts per day
- The load on the circuits
- Dust, heat, moisture or corrosion exposure
- Past fault history
- Criticality of the equipment it controls
- Availability of spares
- OEM recommendations
- Site safety and compliance requirements
Harsh environments usually need more frequent checks. Mining, smelting, wastewater, marine, paper, food processing and dusty manufacturing environments place more strain on electrical equipment than clean, temperature-controlled rooms.
Our suggested maintenance rhythm is:
- Routine visual checks during normal operation
- Thermal imaging while the equipment is energised and under load
- Detailed de-energised inspection during planned shutdowns
- Corrective repairs based on findings
- A written report with photos, test results and recommendations
NFPA 70B is an international reference for electrical equipment maintenance. NFPA describes it as a standard that specifies requirements for properly and safely maintaining electrical equipment. In South Africa, your maintenance work should also align with the Occupational Health and Safety Act, Electrical Installation Regulations, applicable SANS requirements, your site procedures and the correct use of competent electrical personnel.
Can thermal imaging find MCC faults before shutdown?
Yes, thermal imaging is one of the most useful predictive maintenance tools for MCCs because it can detect abnormal heat while the equipment is running.
Our infrared thermography can help identify:
- Loose connections
- Corroded connections
- Poor contacts
- Overloaded circuits
- Phase imbalance
- Overheating breakers
- Hot cable terminations
- Busbar connection issues
- VSD heat problems
- Components operating outside normal conditions
The important part is load. A thermal scan is most useful when the MCC is energised and carrying meaningful load. If the plant is standing, some faults may not show clearly. Our termal monitoring can give visibility into MCC health and help identify overheating and ageing components before failures disrupt operations.
MCC maintenance checklist: What should be checked during shutdown?
We carry out MCC maintenance with competent electrical personnel who use the correct permits, isolation, lockout, and test-before-touch procedures. Once the MCC has been made safe, your shutdown checklist includes the following areas.
1. MCC room and enclosure condition
We start outside the panel. The condition of the MCC room often explains what is happening inside the panel.
Check:
- Is the room clean and dry?
- Is there dust, oil mist, chemical residue or moisture?
- Are panel doors closing properly?
- Are locks and handles working?
- Are cable entries sealed?
- Are gland plates secure?
- Is there corrosion on the enclosure?
- Is access clear for maintenance and emergency work?
- Are ventilation openings blocked?
- Are filters clean?
- Are cooling fans working?
- Is there evidence of rodents, insects or water ingress?
Dust affects cooling. Moisture can cause tracking and corrosion. Poor ventilation raises component temperatures. Small environmental problems become electrical problems if they are left long enough.
2. Busbars and main connections
Busbars carry high current through the MCC, so they need careful inspection.
Check:
- Busbar condition
- Signs of overheating
- Cracked or brittle insulators
- Dust build-up
- Corrosion
- Tracking marks
- Loose fasteners
- Splice connections where serviceable
- Earth bar condition
- Neutral bar condition, where applicable
- Correct barriers and covers
Our MCC maintenance process includes busbar chamber checks to identify hot connections, cracked or brittle insulators, torque setting issues, and dust collection.
3. MCC buckets, starters and contactors
MCC buckets and starters often carry the daily wear of the plant. They switch motors on and off, sometimes many times a day. Our MCC bucket maintenance includes checking contactor condition, hot connections, faulty components, bridged-out protection devices, untidy wiring, trunking covers, obsolete switchgear, cleaning and replacement planning.
Check:
- Contactor condition
- Contact wear, burning or pitting
- Coil condition
- Signs of chattering
- Loose power connections
- Loose control connections
- Overload relay condition
- Overload settings
- Fuses and fuse holders
- Breakers
- Mechanical movement
- Door interlocks
- Correct labels
- Evidence of bridged-out protection devices
If a contactor is burnt, noisy or overheating, do not only replace the contactor and move on. Ask why it failed. The cause may be excessive switching, poor voltage, heat, dust, incorrect selection, loose wiring or a motor fault.
4. Breakers, fuses and protection settings
Protection devices are there to protect equipment and people. They must be correctly rated, correctly installed and in good condition.
Check:
- Breaker condition
- Fuse condition
- Correct fuse ratings
- Signs of overheating
- Mechanical operation
- Trip indications
- Loose terminals
- Correct protection settings
- Coordination with downstream equipment
- Nuisance trip history
- Clear circuit identification
A breaker that trips repeatedly is not a small irritation. It is a symptom. The cause may be overload, short circuit, cable fault, motor fault, heat build-up, incorrect settings or a failing protection device.
5. VSDs and soft starters
VSDs and soft starters are valuable for motor control, but they need clean, cool and stable operating conditions.
Check:
- VSD cooling fans
- Air filters
- Heat sinks
- Fault logs
- Warning history
- Parameter backups
- Cable terminations
- Earthing and screening
- Bypass contactors, where installed
- Enclosure temperature
- Communication wiring
- Soft starter heat sinks
- Signs of capacitor ageing, where applicable
- Correct ventilation around the drive
CAW Electrical’s capabilities include VSD installations and maintenance: VSDs are opened, cleaned, and visually inspected as part of MCC maintenance. VSDs should not be treated as separate boxes that only get attention when they trip. They form part of the MCC reliability picture.
6. Control wiring and marshalling panels
Control wiring faults can be difficult to trace during a breakdown, especially when drawings are outdated or wire numbers are missing.
Check:
- Loose control wiring
- Damaged insulation
- Missing ferrules
- Poor wire numbering
- Broken terminal blocks
- Door wiring
- Relay bases
- Timers
- Control transformers
- PLC inputs and outputs
- Marshalling panel connections
- Overcrowded wiring
- Unsupported cables
- Poor segregation between power and control wiring
CAW’s MCC maintenance includes checking marshalling panel connections for tightness and cleaning. This is important because one loose control wire can cause intermittent starter faults that are hard to find when production is waiting.
7. Earthing, bonding and surge protection
Earthing and bonding are essential for fault protection and electrical safety.
Check:
- Earth bar condition
- Earth continuity
- Loose earth connections
- Door bonding straps
- Gland plate bonding
- Cable gland condition
- Surge protection devices
- Signs of lightning or transient damage
- Labels and test records
Earthing is not a once-off installation issue. Vibration, corrosion, modifications and previous repair work can affect the integrity of the system over time.
8. Cleaning and housekeeping
MCC cleaning must be done properly. Blowing dust around a live or sensitive electrical panel is not maintenance.
Check and clean:
- Dust on insulation
- Dust around busbars
- Dust around VSD heat sinks
- Blocked vents
- Dirty filters
- Loose screws or washers
- Cable offcuts
- Metal filings
- Oil residue
- Moisture marks
- Corrosion products
CAW’s MCC maintenance includes cleaning MCC buckets, exterior cleaning of MCCs and rooms, and filter system cleaning or replacement. A clean MCC is easier to inspect, easier to cool and less likely to develop tracking, overheating or contamination-related faults.
9. Testing before restart
Before the MCC is re-energised, the work should be checked and tested according to the site procedure, equipment type and applicable standards.
Depending on the scope, this may include:
- Insulation resistance testing
- Continuity checks
- Earth continuity testing
- Control circuit testing
- Functional testing
- Interlock checks
- Emergency stop checks
- Phase rotation checks
- VSD functional checks
- Soft starter checks
- Metering checks
- Protection setting verification
- Final visual inspection
- Confirmation that covers and barriers are refitted
Before restart, confirm that tools, rags, loose screws and debris have been removed from the panel. Then re-energise according to procedure and monitor the MCC under load.
What should an MCC maintenance report include?
CAW’s MCC report will help you make decisions. It doesn’t simply say “MCC checked”.
Your report includes:
- MCC name and location
- Date of inspection
- Scope of work
- Circuits inspected
- Safety procedures followed
- Thermal imaging findings, where applicable
- Visual inspection findings
- Test results
- Photos of defects
- Immediate repairs completed
- Critical faults found
- Non-critical issues found
- Obsolete components identified
- Spares required
- Recommended follow-up work
- Priority ranking for corrective action
- Notes on drawings, labels and documentation
- Final status after restart
This is especially important for older sites where panels have been modified over many years. A good report helps you plan spares, budget for upgrades, reduce repeat failures and decide whether equipment should be repaired, refurbished or replaced.
Should you repair, refurbish or replace an old MCC?
Many industrial sites are still running older MCCs. Age alone does not always mean replacement is needed, but repeated faults should not be ignored.
Refurbishment may make sense when:
- The MCC structure is still sound
- Busbars and insulation are in acceptable condition
- Spares are still available
- Protection devices can be upgraded
- Drawings can be corrected
- Labelling can be improved
- Components can be replaced safely
- Downtime for full replacement is difficult
- The MCC still suits the plant’s operating requirements
Replacement or major upgrade may be needed when:
- Components are obsolete
- Faults are recurring
- The MCC is overheating
- Spares are difficult to source
- The system has been modified too many times
- Documentation is missing or unreliable
- Safety risk is increasing
- The plant has changed but the MCC has not
- Fault levels or load requirements have changed
- Compliance concerns cannot be corrected through refurbishment
CAW Electrical offers refurbishment and retrofitting of electrical equipment. We refurbish MCCs, smaller starter panels, distribution boards, mini substations, and 33kV switchgear, with ratings maintained according to drawings and removed equipment.
The right decision should be based on inspection findings, operational risk, safety, cost, downtime and the availability of suitable parts.
Quick MCC shutdown checklist
Use this as a planning tool before your next shutdown.
Before shutdown
- Confirm the latest drawings are available
- Identify critical motor circuits
- Review breakdown history
- Review VSD and soft starter fault logs
- Schedule thermal imaging under load
- Arrange spares
- Confirm the shutdown window
- Confirm permit and isolation requirements
- Prepare test equipment
- Confirm reporting requirements
- Brief production and maintenance teams
During shutdown
- Isolate and make safe
- Open and inspect compartments
- Check MCC room and enclosure condition
- Inspect busbars and main connections
- Check MCC buckets
- Inspect breakers, fuses and protection devices
- Check contactors and overloads
- Inspect VSDs and soft starters
- Check control wiring and marshalling panels
- Inspect earthing and bonding
- Clean panels, filters and ventilation areas
- Replace damaged or unsafe components
- Correct temporary or untidy wiring
- Update labels where required
- Test before restart
After shutdown
- Re-energise according to procedure
- Monitor load
- Check for heat, smell, noise or vibration
- Confirm VSDs and starters are operating correctly
- Issue the maintenance report
- Prioritise corrective actions
- Order required spares
- Update drawings and records
- Plan future refurbishment or replacement work where needed
Why use CAW Electrical for MCC maintenance?
MCC maintenance is not only about the panel. It is about the equipment the panel controls. That is where CAW’s wider electromechanical experience matters. CAW Electrical works on MCCs, VSDs, switchgear, electrical installations, MV equipment, cabling, compliance audits and breakdown support. CAW also works on motors, pumps, alternators and generators, which allows us to look beyond the panel when a fault is linked to the connected equipment.
CAW Electrical has experience in demanding environments including sand mining, smelter operations, water supply and treatment systems, ships, and manufacturing.
CAW Electrical can assist with:
- MCC inspections
- MCC maintenance
- MCC refurbishment and retrofitting
- VSD installation and maintenance
- Switchgear maintenance and repairs
- Low-voltage installations and maintenance
- MV equipment maintenance and repairs
- Cable racking installations
- MV cable joints and terminations
- Plant-wide compliance audits
- CoC issuing
- Infra-red thermal imaging and reports
- 24-hour breakdown assistance
Need help planning MCC maintenance?
If your MCCs are showing signs of heat, repeated trips, VSD faults, ageing components, poor labelling, obsolete switchgear or unexplained motor stoppages, it is worth investigating before the next breakdown.
CAW Electrical can help you inspect, maintain, test, repair, refurbish or retrofit your MCCs and related electrical equipment, with support from a wider electromechanical team that understands the motors, pumps, alternators and generators connected to your system.
Speak to CAW about MCC maintenance, thermal imaging, VSD maintenance, switchgear repairs, electrical compliance audits, or planned shutdown support today.
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FAQs about MCC maintenance
What does MCC stand for?
MCC stands for motor control centre. It is an electrical assembly used to control and protect multiple motors from one central point.
What is included in MCC maintenance?
With CAW, MCC maintenance includes visual inspection, thermal imaging, busbar checks, breaker checks, contactor inspection, overload checks, VSD inspection, soft starter inspection, control wiring checks, earthing checks, cleaning, testing, fault reporting, and corrective repairs.
How often should an MCC be inspected?
The interval depends on your site conditions, equipment age, load, environment and criticality. Harsh industrial environments usually need more frequent checks than clean, controlled environments.
Can MCC maintenance be done while the plant is running?
Some inspections, such as thermal imaging, are done while equipment is energised and under load by trained personnel using the correct safety procedures. Internal inspection, cleaning, testing and repair work usually require safe isolation and de-energisation.
Why is thermal imaging useful for MCC maintenance?
Thermal imaging can identify abnormal heat caused by loose connections, poor contacts, overloading, phase imbalance, corrosion or failing components. It helps you find developing faults before they become breakdowns.
What causes MCCs to overheat?
Common causes include loose terminals, overloaded circuits, blocked ventilation, dirty filters, poor panel cooling, failing contactors, poor cable terminations, unbalanced loads, ageing components and VSD heat issues.
What is the difference between MCC maintenance and switchgear maintenance?
MCC maintenance focuses on the control and protection of motor circuits. Switchgear maintenance focuses more broadly on electrical distribution, switching and protection equipment. Many industrial sites need both to be maintained as part of the same electrical reliability plan.
Should an old MCC be repaired or replaced?
It depends on the condition of the MCC, availability of spares, safety risk, fault history, load requirements and whether the panel still suits the plant. In many cases, refurbishment or retrofitting can extend the useful life of the equipment. In other cases, replacement is safer and more cost-effective.