Commercial Electrical Preventive Maintenance

The exact maintenance scope depends on the property, but OTC can evaluate electrical systems including:

Electrical Panels

We look for conditions such as:

• Heat discoloration

• Loose or deteriorating breakers

• Damaged bus

• Missing hardware

• Water intrusion

• Poor labeling

• Unsafe previous modifications

• Obsolete equipment

Switchboards & Switchgear

Larger distribution equipment deserves additional attention because a failure can affect significant portions of the property.

Potential concerns include:

• Abnormal buzzing

• Bus discoloration

• Loose components

• Missing hardware

• Overheating

• Arcing evidence

• Obsolete breakers or components

Transformers

Transformer maintenance can include evaluating:

• Physical condition

• Ventilation

• Excessive heat

• Abnormal noise

• Connections

• Loading

• Voltage

• Accessibility

Breakers & Feeders

OTC looks for signs of:

• Overheating

• Improper loading

• Damaged connections

• Breaker deterioration

• Conductor damage

• Phase imbalance

Backup & Safety Systems

Preventive maintenance can also include electrical portions of:

• Standby generators

• Automatic transfer switches

• UPS systems

• Surge protection

• Emergency lighting

• Exit signs

Electrical connections can begin deteriorating long before equipment completely fails.

Excessive heat may result from:

• Loose connections

• Overloading

• Failed breakers

• Corrosion

• Damaged bus

• Improper terminations

If the condition is found early, the repair may be relatively minor.

If it continues, the heat can damage surrounding:

• Breakers

• Conductors

• Bus

• Panels

• Equipment

The goal of preventive maintenance is to find the smaller problem before it becomes the larger repair

Where appropriate, thermal imaging can help identify abnormal temperature differences in energized electrical equipment.

Potential areas include:

• Breakers

• Feeder connections

• Panel bus

• Switchgear

• Transformers

• Disconnects

Thermal imaging does not replace proper electrical testing. It gives OTC another way to identify conditions that deserve further investigation.

Other testing may include:

• Voltage measurements

• Current measurements

• Phase comparison

• Insulation-resistance testing where appropriate

• Functional testing of electrical equipment

Testing should be performed for a reason—not simply to create a report full of numbers.

Water intrusion is one of the most common problems affecting exterior and underground electrical systems.

OTC pays particular attention to:

• Exterior panels

• Disconnects

• Junction boxes

• Underground circuits

• Site lighting equipment

• Rooftop electrical systems

Water can contribute to:

• Corrosion

• Ground faults

• Insulation damage

• Breaker trips

• Equipment deterioration

Catching those conditions early can prevent a difficult troubleshooting call later.

An electrical panel, breaker, or switchboard does not need to be completely failed before it becomes a concern.

Preventive maintenance also asks:

• Are replacement breakers still available?

• Is the equipment supported?

• Are parts becoming expensive?

• Is the existing gear reliable enough to keep repairing?

• What happens if this component fails tomorrow?

This allows owners to plan replacements before obsolete equipment creates an extended emergency outage.

Bad electrical documentation adds time to every future service call.

OTC can identify and correct issues such as:

• Incorrect panel schedules

• Mystery circuits

• Unidentified breakers

• Abandoned circuits

• Inaccurate equipment labels

For larger properties, updated one-lines or simplified distribution maps can also help future technicians understand how power moves through the building.

The goal is that the next service call does not begin with hours of reverse engineering.

Preventive maintenance should do more than identify repairs.

It should help the owner understand what is likely to become a future capital expense.

OTC can identify equipment that may need:

• Panel replacement

• Switchgear replacement

• Transformer replacement

• Service upgrade

• Distribution modernization

• Lighting upgrade

This gives the property manager or owner time to budget instead of learning about the project during an emergency shutdown.

OTC can organize findings into practical categories:

Urgent

Conditions that should be addressed immediately because of safety or failure risk.

Repair Soon

Items that are still operating but show deterioration that should be corrected.

Capital Upgrade

Larger equipment or systems that should be planned and budgeted for replacement.

Monitor

Conditions that do not currently justify repair but should be watched during future inspections.

This gives the customer a usable electrical maintenance plan instead of a technical report with no direction.

There is no single schedule that fits every commercial property.

Frequency depends on:

• Building type

• Equipment age

• Electrical load

• Operating environment

• Criticality

• Previous failures

A Class A office property may need a different program than a manufacturing facility running large equipment every day.

OTC can help establish a maintenance schedule around the actual building instead of forcing every property into the same program.