Free checklist
Power factor correction capacitor bank quarterly maintenance checklist
A quarterly capacitor bank 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 NFPA 70B, NEC (NFPA 70). Confirm the edition your authority having jurisdiction has adopted.
The checklist
Every item, and the photo evidence it needs
The photo count on each row is what RTI would require before the item can be submitted. Work the list here and watch the gate hold, or load it into RTI and let it enforce the real thing.
Before approaching the bank
Arc-flash label and capacitor warning signs read on the enclosure
Arc-flash label legible with its study date and the stored-energy warning in place, with any missing or faded sign reported to the owner.
Bank read with doors shut, PPE from the risk assessment
Bank read through the closed door or viewing window only, with PPE chosen from the site's arc-flash risk assessment for the approach, not from the label alone.
No photoEnclosure doors latched with no missing fasteners or damage
Every door and panel on the bank closed and fastened, no bent panels, broken hinges or gaps that would let dust or a hand in.
Cans and fuses
Capacitor cans checked for bulging and leaking
No swollen, domed or split cases, no oil or dielectric weeping at the bushings or seams, no scorching on a can face.
Fuse indicators read across the stages
Each capacitor fuse or blown-fuse indicator checked, none popped or discolored, no stage limping along on a lost phase.
Floor under the enclosure checked for seeping fluid
No dielectric fluid stain or drip at the enclosure base or on the floor beneath it, with any found reported as a leaking can for the outage.
Switching and controller
Contactor or stage switching observed
Stages pulling in and dropping out cleanly as the controller calls them, no contactor chattering or a stage stuck in or out.
Controller and power factor reading checked
Controller displaying a corrected power factor near target, no alarm or fault code, reading cross-checked against actual stage current.
Controller step status and settings compared with the design
Steps shown available match the design stage list and the target power factor matches the design or commissioning setting, with any locked-out step or changed setting noted.
Harmonic warning signs reported to the engineer
A harmonic alarm on the controller, humming cans, repeat fuse failures or overheating reported to the engineer for a power quality review, not adjusted in the field.
No photo
Cooling and heat
Ventilation clear and cans not overheating
Cooling vents and any fans clear and running, cans scanned through IR windows where fitted, otherwise left to the annual, and room airflow reaching the bank.
Room ambient temperature read against the nameplate rating
Room or enclosure temperature read and compared with the ambient rating on the bank nameplate, with a reading above it reported to the owner.
Reactor section listened to and checked for heat on detuned banks
On detuned banks, no new hum, vibration or heat from the reactor section felt at the closed enclosure. Not applicable to banks built without reactors.
No photo
Findings and follow-up
Power factor and steps available trended by quarter
Power factor, steps available, fuse indicators and room temperature logged beside last quarter's, so a stage that has dropped out shows as a trend with a date.
No photoFailed cans, fuses and steps queued for the outage with parts
Each bulged can, blown fuse, faulted step or hot reading reported to the owner, so the annual outage scope includes it and parts are ordered ahead.
No photo
What usually sends this back
The failures are almost always the evidence, not the work
- A bulging or seeping can noticed but written off as 'always looked like that', so a failing capacitor is left switching in and out.
- The controller reading a healthy power factor while a whole stage's contactor has stopped pulling in, and no one cross-checks the amps.
- A blown capacitor fuse whose indicator has popped, missed because the door stays shut and the indicators are never read.
Verified against
Common questions
6 answers
- What does this power factor correction capacitor bank quarterly checklist cover?
- 15 items across 5 sections, covering before approaching the bank, cans and fuses, switching and controller, cooling and heat, and more. 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 facility electrician on the quarterly round, reading the bank energized through the door or viewing window.
- When in the schedule should this walk happen?
- Every quarter, timed against a loaded part of the day so the controller is actually calling stages in and the power factor reading means something.
- Why do these items ask for a photo?
- 10 of the 15 items call for photo evidence, 12 photos in all. 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 power factor correction capacitor bank quarterly inspection?
- A bulging or seeping can noticed but written off as 'always looked like that', so a failing capacitor is left switching in and out. The controller reading a healthy power factor while a whole stage's contactor has stopped pulling in, and no one cross-checks the amps. A blown capacitor fuse whose indicator has popped, missed because the door stays shut and the indicators are never read.
- 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.
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 12 required photos exist. Approved walks roll into a branded turnover package with a tamper evident record behind every line.
See all 508 checklists · 6741 items and 5984 photo requirements in total.