Planned Electrical Maintenance: A Yearly Calendar for Nigerian Facilities

Most electrical breakdowns give warning signs long before they stop a building or a production line. Planned maintenance is how you catch those signs early. For Nigerian facilities, where equipment works hard in heat, humidity, dust and frequent switching between grid and generator, a simple yearly maintenance plan saves money, downtime and risk.

This guide explains why planned maintenance matters and gives a practical yearly calendar you can adapt for your facility.

Why planned maintenance pays

• Fewer breakdowns: loose connections, worn contacts and failing insulation are found before they fail.
• Lower repair costs: a planned repair costs far less than an emergency call-out and lost production.
• Longer equipment life: transformers, breakers and panels that are kept clean, tight and tested last longer.
• Safety: many electrical fires start at overheated connections that routine inspection would have found.
• Records: test results show the condition of your installation over time and support insurance and compliance.

Common problems that maintenance prevents

• Breakers tripping without a clear reason
• Burnt terminals and melted cable insulation in distribution boards
• Flickering lights and voltage problems
• Overheating transformers and leaking transformer oil
• Generator changeover failures during outages
• Earth resistance rising in the dry season

A yearly maintenance calendar

Adjust the intervals to the size and criticality of your site. Industrial plants and hospitals usually need shorter intervals than offices.

Monthly

• Walk-round visual inspection of switch rooms and distribution boards
• Check panel indicators, meters and alarms
• Check that board covers are in place and switch rooms are clean, dry and not used for storage
• Test emergency lighting
• Check the generator changeover or ATS operates correctly

Quarterly

• Thermal imaging of main switchboards and major distribution boards under load
• Transformer visual check: oil level, leaks, silica gel breather and temperature
• Check and tighten accessible terminations where hot spots are found
• Review breaker trip records and recurring faults

Every six months

• Clean and inspect LV panels, busbars and cable terminations (with the supply isolated)
• Service air circuit breakers and test their trip function
• Check power factor correction panels and capacitor condition
• Test RCDs on socket circuits

Yearly

• Earth resistance testing of all earth pits, ideally once in the dry season
• Lightning protection inspection and testing
• Transformer oil sampling and testing
• Insulation resistance testing of main cables and switchgear
• HV switchgear and RMU maintenance and protection relay checks
• Full electrical safety audit with a written report

Who should do the work?

Visual checks can be done by trained facility staff. Anything that involves opening panels, isolating supplies, HV equipment or testing should be done by qualified electrical engineers with calibrated test equipment, under permit-to-work and lock-out procedures. Read what happens when the wrong person does the job.

Keep the records

Every maintenance visit should end with a short report: what was checked, what was found, test results and what needs fixing. Over a year or two, these records show which equipment is deteriorating and help you plan replacements before they fail.

Related reading: 10 common hazards an electrical safety audit finds.

Talk to Corustar

Corustar Technological Services is an electrical engineering contractor based in Ikeja, Lagos, working across Nigeria. See our Installation, Maintenance & 24/7 Repairs service, request a quote, or call +234 816 976 9672. For outages and faults, call our 24/7 emergency line on 0705 739 9297.