Free checklist
Automatic transfer switch (ATS) quarterly maintenance checklist
A quarterly automatic transfer switch round is short on purpose: it catches the wear items that fail between annual services. This checklist is sized for a tech with a phone. Every item says what to look at and the photo that proves the round happened. Work is commonly verified against NEC (NFPA 70), NFPA 110, manufacturer's published instructions. Confirm the edition your authority having jurisdiction has adopted.
- Items
- 4
- Photos required
- 5
- Built for
- Subcontractors
Who runs it
The electrical or facilities tech on the quarterly round, coordinated with whoever runs the generator so the building isn't dropped.
When in the schedule
Every quarter, tied to the generator exercise since the transfer switch is what proves the generator actually picks up the load.
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.
Controller and status
- 1 photo
Controller display and source indicators read
Normal source present, controller in automatic, no active alarms or lockouts, source-available and switch-position lights matching reality.
- 1 photo
Time-delay and pickup settings match the commissioned record
Engine-start, transfer and retransfer delays checked against the setup sheet, not just left at whatever the last tech entered.
Transfer test
- 2 photos
No-load or exercise transfer observed end to end
Switch commanded to transfer and retransfer, mechanism moving fully to each position, position confirmed on the controller and by the mechanical indicator.
Enclosure
- 1 photo
Enclosure closed, sealed and clear
Door latched, gaskets intact, no water staining or rodent entry, required working clearance kept in front of the switch.
What usually sends this back
The failures are almost always the evidence, not the work
- Generator exercised in no-load mode while the transfer switch itself never actually transfers, so a stuck mechanism goes unfound until an outage.
- Controller sitting in a fault or maintenance-lockout state for weeks because nobody reads the display.
- Engine-start and transfer time delays bumped during a service call and never returned to the commissioned values.
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 5 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) quarterly checklist cover?
- 4 items across 3 sections, covering controller and status, transfer test, enclosure. 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 or facilities tech on the quarterly round, coordinated with whoever runs the generator so the building isn't dropped.
- When in the schedule should this walk happen?
- Every quarter, tied to the generator exercise since the transfer switch is what proves the generator actually picks up the load.
- Why does every item ask for a photo?
- 5 of the 4 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) quarterly inspection?
- Generator exercised in no-load mode while the transfer switch itself never actually transfers, so a stuck mechanism goes unfound until an outage. Controller sitting in a fault or maintenance-lockout state for weeks because nobody reads the display. Engine-start and transfer time delays bumped during a service call and never returned to the commissioned values.
- 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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