In a factory or industrial facility, the main switchboard — sometimes called the main distribution board (MDB) or motor control centre (MCC) — is not just a box of circuit breakers. It is the primary interface between your entire electrical infrastructure and the mains supply, and it controls the power distribution to every machine, motor, lighting circuit, and ancillary system in your building. When it fails, production stops. When it fails catastrophically, people get hurt.
MDEE Electrical carries out industrial switchboard upgrades, repairs, and condition assessments throughout Gauteng. This article explains what an industrial switchboard upgrade involves, when yours needs attention, and why this is one area where engaging an experienced, registered electrical contractor is not optional.
What Is in an Industrial Switchboard?
A typical industrial main distribution board contains the main incoming isolator (which disconnects the entire facility from the supply), the main earth leakage protection, bus bars that distribute power to outgoing circuits, moulded case circuit breakers (MCCBs) or air circuit breakers (ACBs) protecting each outgoing feeder, surge protection devices, power factor correction capacitors in some installations, metering equipment, and in some cases motor soft starters or variable speed drives.
In a motor control centre, you will also find individual motor starters — traditionally direct-on-line (DOL) contactors with overload relays, increasingly replaced by electronic soft starters and variable frequency drives (VFDs) — and the associated control wiring for each drive or starting circuit.
Signs Your Industrial Switchboard Needs Attention
- Age above 15 to 20 years, particularly if the facility’s electrical load has grown since installation.
- Visible signs of overheating — discoloured bus bars, melted cable insulation, or a persistent burning smell.
- Nuisance tripping of MCCBs that cannot be attributed to a genuine overload or fault.
- Inability to obtain replacement parts or circuit breakers for the existing equipment.
- Physical damage from rodents, water ingress, or mechanical impact.
- Failing power factor correction equipment resulting in higher electricity tariffs from the utility.
- Expansion of the facility requiring additional feeder circuits that the existing board cannot accommodate.
The Risk of Deferred Maintenance
Unlike a residential DB board, where the consequences of failure are inconvenience and potential fire, the consequences of a failed industrial switchboard can include injury or death from arc flash, destruction of expensive equipment throughout the facility, significant production downtime, and regulatory liability. The Occupational Health and Safety Act (OHSA) and its Electrical Installation Regulations require employers to maintain electrical equipment in safe condition. An employer who allows a deteriorated switchboard to remain in service has no defense when something goes wrong.
What a Switchboard Upgrade Project Looks Like
MDEE Electrical approaches industrial switchboard upgrades as full engineering projects. We begin with a condition assessment and single-line diagram review, identify the scope of upgrade required, design the replacement board with correct protection coordination and fault level ratings, manage the procurement of switchgear and enclosures, and plan the changeover to minimise production downtime — often carrying out critical tie-ins and changeovers over weekends or during planned maintenance shutdowns.
We perform full commissioning and testing on the new board before handover, including insulation resistance testing, protection relay function tests, and earth continuity verification. All work is documented and a Certificate of Compliance issued in accordance with SANS 10142-2 (the industrial wiring standard).
Industrial electrical work carries real risk. Arc flash from a fault in a switchboard can release more energy in milliseconds than a stick of dynamite. Always engage a registered electrical contractor with demonstrable industrial experience for switchboard work — never accept an undocumented or non-compliant installation.
