A switchgear maintenance checklist keeps your most critical electrical equipment reliable and your arc flash study accurate. Switchgear distributes power to entire production areas, so when it fails, lines stop and workers face serious hazards. This checklist covers planning, infrared scanning, inspection, cleaning, testing, and records for low- and medium-voltage switchgear in industrial and manufacturing facilities. It follows the approach used in NFPA 70B and ANSI/NETA maintenance testing practices, and it reflects how Bowtie Engineering plans switchgear maintenance for plants across the United States.
Why Switchgear Maintenance Matters
Switchgear maintenance protects uptime, safety, and compliance at the same time. Dust, moisture, heat, and loose connections wear down switchgear over years of service. Breakers that sit closed for long periods can become slow to operate.
That last point matters for safety. Your arc flash study assumes each breaker will clear a fault within a set time. A breaker that trips slowly lets the arc burn longer, which raises the energy a worker could face. Bowtie Engineering covers this risk in more detail in how switchgear maintenance mistakes skew an arc flash study. NFPA 70B, which became a standard in 2023, also makes a documented maintenance program a requirement rather than a recommendation.
Planning Checklist Before the Outage
Most switchgear maintenance happens during a planned outage. Good planning keeps the outage short and the crew safe. Before the work window:
- Confirm one-line diagrams are current and show every section of gear in scope
- Check that the arc flash study and labels are up to date
- Schedule the outage window with production and operations
- Plan how each section will be placed in an electrically safe work condition and locked out
- Pull previous test reports so new results can be compared
- Line up replacement parts for items that commonly fail
- Confirm the crew is qualified and current on NFPA 70E training
- Hold a job briefing covering hazards, energy controls, and PPE
Infrared Scan While Energized
Scan the switchgear with infrared thermography before the outage, while it is energized and under load. The scan shows hot connections, overloaded phases, and failing components, so the crew knows where to focus once the gear is de-energized.
Use the scan results to set priorities. The ANSI/NETA Maintenance Testing Specifications treat a temperature difference of more than 15°C between similar components under similar load as a major discrepancy that calls for immediate repair, so those findings go to the top of the outage work list.
Bowtie Engineering’s infrared surveys include thermal and visible-light images, temperature differences, and a priority rating for every finding, plus a report of code violations seen while covers are open at no extra charge.
Warning Signs That Switchgear Needs Attention Now
Some problems should not wait for the next scheduled outage. Call for an inspection when you notice:
- Hot spots, discoloration, or a burning smell near the gear
- Buzzing, crackling, or other unusual sounds
- Breakers that trip without a clear cause or fail to close
- Signs of water, condensation, or pests inside the enclosure
- Visible corrosion on bus, lugs, or terminations
- Gear that has not been maintained or tested in years
Crew Safety Checklist for Switchgear Work
Switchgear holds some of the highest available fault current in a facility, so the maintenance itself must be done safely. Before anyone opens a cubicle:
- Identify every source of supply from the one-line diagram, including tie breakers and backup sources
- Open, lock, and tag each source following the written procedure
- Test for absence of voltage with a properly rated tester, and check the tester before and after use
- Apply temporary protective grounds where the work requires them
- Wear PPE that matches the arc flash label for any task done before the gear is verified de-energized
- Use remote racking devices where available to keep workers outside the arc flash boundary
- Account for stored energy in springs and capacitors
Only after the gear is verified de-energized should the crew move on to hands-on inspection, cleaning, and testing.
Visual and Mechanical Inspection Checklist
With the gear safely de-energized and locked out, inspect each section:
- Enclosure condition, including signs of moisture, corrosion, dust buildup, or pests
- Insulators and barriers for cracks, tracking, or discoloration
- Bus connections and cable terminations for heat damage or looseness
- Space heaters, ventilation, and filters
- Door interlocks, shutters, and breaker racking mechanisms
- Mechanical operation of each breaker, including manual open and close
- Operation counters and indicating devices
- Grounding connections
- Nameplates, labels, and arc flash labels for legibility and accuracy
Cleaning Checklist
Dirt and moisture on insulating surfaces can lead to tracking and flashover. Clean only when the equipment is de-energized and verified safe:
- Remove dust with a vacuum and wipe with cleaners the manufacturer approves
- Avoid methods that push contamination deeper into the gear
- Clean insulators and barriers, then inspect them again
- Lubricate moving parts only as the manufacturer specifies
Electrical Testing Checklist
Inspection shows the condition you can see. Testing shows how the equipment will perform in a fault. The ANSI/NETA standards, including the Maintenance Testing Specifications, describe these tests in detail.
Insulation Resistance Testing
Measures the health of insulation on bus, cables, and breakers. Comparing results to past tests shows whether insulation is breaking down.
Contact Resistance Testing
Measures resistance across breaker contacts and bolted connections. High readings point to worn contacts or poor connections that create heat.
Circuit Breaker Primary Injection Testing
Injects current through the breaker to confirm it trips within the time the arc flash study assumes. Bowtie Engineering performs primary injection testing on low- and medium-voltage circuit breakers and switchgear.
Protective Relay Testing and Calibration
Confirms relays operate correctly and that their settings match the coordination study.
Ground Resistance Testing
Verifies the grounding system provides a low-resistance path for fault current.
Bowtie Engineering performs testing to NETA standards through NETA-certified technicians, and every test produces a written report with measured values. You can see the full scope on the NETA testing services page.
How Often Switchgear Should Be Maintained
There is no single interval for every facility. NFPA 70B ties maintenance intervals to equipment condition, how critical the equipment is to operations, its environment, and its loading. Gear in poor condition, in a dusty or humid space, or feeding critical loads needs more frequent attention than clean, lightly loaded gear in good condition.
Certain events should also prompt maintenance outside the normal cycle:
- After a breaker clears a fault
- After new equipment is commissioned
- When an insurer or corporate policy requires it
- When an infrared scan or inspection finds a problem
Documentation Checklist
Maintenance that is not documented is hard to prove and easy to repeat. After the work:
- Update the equipment inventory
- File test reports with measured values for every device
- Rank deficiencies by priority: fix now, schedule, or monitor
- Keep written certification of the testing performed
- Update the arc flash study if any protective device settings changed
- Record the next due date for each piece of equipment
For Bowtie Engineering service-contract clients, test results load into BowVue alongside the arc flash data and the rest of the electrical record.
Choosing a Switchgear Maintenance Provider
Look for a provider that can scan, inspect, clean, test, and document in one coordinated visit, and that understands how maintenance affects your arc flash study. Bowtie Engineering’s electrical maintenance services include switchgear inspection, cleaning, mechanical checks, and testing, with one-time assessments or recurring NFPA 70B-aligned maintenance contracts. The company can deploy NETA-certified technicians anywhere in the United States.
Frequently Asked Questions
Can switchgear maintenance be done without a shutdown?
Infrared scanning is done while the gear is energized. Cleaning, mechanical inspection, and most electrical testing require the equipment to be de-energized and placed in an electrically safe work condition.
What is the most important switchgear maintenance test?
Every test answers a different question, but circuit breaker primary injection testing is critical for safety because it confirms breakers clear faults as fast as the arc flash study assumes.
Is switchgear maintenance required?
NFPA 70B, a standard since 2023, requires a documented electrical maintenance program, and many insurers and corporate policies require regular maintenance and testing as well.
How long does switchgear maintenance take?
It depends on how many sections of gear are in scope, which tests are needed, and the length of the outage window. A provider should give you a schedule with the quote so you can plan the outage with production.
Who should perform switchgear maintenance?
Qualified electrical workers who are trained to NFPA 70E and experienced with the type of gear in your facility. Bowtie Engineering performs testing to NETA standards through NETA-certified technicians and can deploy them anywhere in the United States.
Planning your next switchgear outage? Call Bowtie Engineering at 866-730-6620 or request a maintenance quote.