Free checklist
Automatic transfer switch (ATS) annual maintenance checklist
The annual automatic transfer switch service is the deep pass: the measurements, cleanings and tests a quarterly round doesn't reach. This checklist keeps the full service on record with the photos that make it defensible later. Work is commonly verified against NEC (NFPA 70), NFPA 110, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.
- Items
- 5
- Photos required
- 7
- Built for
- Subcontractors
Who runs it
The electrical service tech on the annual, with a plan for the momentary outage the on-load test creates.
When in the schedule
Once a year, scheduled when the served loads can ride through a real transfer and back, and when the switch can be opened de-energized afterward.
The checklist
Every item, and the photo that proves it
The photo count on each row is what RTI would require before the item can be submitted. Copy the list as is, or load it into RTI and let the gate enforce it.
Live-load transfer
- 2 photos
Full on-load transfer to the alternate source and back
Actual building load transferred to the generator, run under load, then retransferred, transition timing observed against the settings.
Heat and connections (thermography awareness)
- 2 photos
Line and load connections scanned for heat under load
Terminations checked with a thermal camera or infrared spot while loaded, any hot lug compared against its neighbors and flagged.
- 1 photo
Terminations re-torqued de-energized after the scan
Switch locked out after the load test, power lugs torqued to the manufacturer's published values, heat-discolored hardware replaced.
Mechanism and control power
- 1 photo
Main contacts and mechanism inspected
Contacts checked for pitting and burning where accessible, mechanism and arc structures inspected, lubrication per the manufacturer.
- 1 photo
Controller battery and control power verified
Controller battery or control-power source tested, so the switch can still run its logic during an actual outage.
What usually sends this back
The failures are almost always the evidence, not the work
- On-load transfer skipped because it means a real interruption, so the switch is only ever proven with no load behind it.
- Loose or hot lug on the line or load side found only after it has burned the insulation, because connections are never scanned under load.
- Contacts never inspected, so pitting and burning build up until a transfer arcs or fails to make.
Run it with the Photo Gate
A checklist nobody can submit half-finished
Load this list into RTI, stick a QR tag on the area it covers, and the submit button stays locked until every mandatory item is answered and the 7 required photos exist. Approved walks roll into a branded turnover package with a tamper-evident record behind every line.
Submission state
The gate is enforced on the server, so it holds even if the phone is offline when the walk happens.
Verified against
Common questions
- What does this automatic transfer switch (ats) annual checklist cover?
- 5 items across 3 sections, covering live-load transfer, heat and connections (thermography awareness), mechanism and control power. Each item spells out what the person walking the job is actually looking for, not just a box to tick.
- Who should run this inspection?
- The electrical service tech on the annual, with a plan for the momentary outage the on-load test creates.
- When in the schedule should this walk happen?
- Once a year, scheduled when the served loads can ride through a real transfer and back, and when the switch can be opened de-energized afterward.
- Why does every item ask for a photo?
- 7 of the 5 items call for photo evidence. A checklist answer without the photo is a claim; the photo is what makes the record worth something in a dispute and lets a reviewer approve work without re-walking the job.
- What most often fails a automatic transfer switch (ats) annual inspection?
- On-load transfer skipped because it means a real interruption, so the switch is only ever proven with no load behind it. Loose or hot lug on the line or load side found only after it has burned the insulation, because connections are never scanned under load. Contacts never inspected, so pitting and burning build up until a transfer arcs or fails to make.
- Can I use this checklist in RTI?
- Yes. Start a free RTI workspace, build this list as a checklist, and the Photo Gate holds the submit button until every mandatory item is answered and its photos are attached. Approved inspections roll into a branded turnover package with a tamper-evident audit trail.
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