Checklists by Category
Power distribution unit maintenance checklists
Power distribution unit maintenance checklists for the quarterly and annual rounds: 2 free lists, 29 items and 22 photo requirements, each item naming what to look for and the photo evidence it needs. Work is commonly verified against NEC (NFPA 70) and NFPA 70B; the edition in force is the AHJ's call on each project.
The power distribution unit rounds
Where each walk sits in the schedule
01quarterly
Power distribution unit quarterly maintenance checklist
Every quarter, energized, catching load imbalance and hot connections before they turn into an outage on the loads downstream.
Run by: The electrician or facilities tech on the quarterly electrical round.
02annual
Power distribution unit annual maintenance checklist
Once a year during a planned outage, since torqueing terminations and opening the transformer section means the unit has to come down.
Run by: The electrician on the annual de-energized service, coordinated with a scheduled shutdown.
What most often fails on a power distribution unit
- Load read only at the main, so one phase quietly running hot goes unnoticed while the total still looks fine.
- Thermal scan skipped because the covers were left closed, and a loose lug cooks undetected between visits.
- Intake filters blinded with drywall dust from ongoing work in the room, so the cooling fans run the section hot.
- Terminations 'checked' by wiggling instead of torqued, so a creeping loose connection is never actually found.
- Transformer section skipped because it needs a shutdown, and its ventilation stays choked with dust year on year.
Verified against
Families only, never clause numbers. Adoption varies by jurisdiction; confirm the edition your authority having jurisdiction enforces before you run a walk against it.
Related units and trades
Common questions
5 answers
- Which power distribution unit maintenance rounds do these checklists cover?
- Power distribution unit quarterly maintenance checklist (quarterly): Every quarter, energized, catching load imbalance and hot connections before they turn into an outage on the loads downstream. Power distribution unit annual maintenance checklist (annual): Once a year during a planned outage, since torqueing terminations and opening the transformer section means the unit has to come down.
- Who runs the power distribution unit maintenance round?
- The electrician or facilities tech on the quarterly electrical round. The electrician on the annual de-energized service, coordinated with a scheduled shutdown.
- What most often fails on a power distribution unit?
- Load read only at the main, so one phase quietly running hot goes unnoticed while the total still looks fine. Thermal scan skipped because the covers were left closed, and a loose lug cooks undetected between visits. Intake filters blinded with drywall dust from ongoing work in the room, so the cooling fans run the section hot. Terminations 'checked' by wiggling instead of torqued, so a creeping loose connection is never actually found.
- Which standards is power distribution unit work verified against?
- NEC (NFPA 70), published by the National Fire Protection Association; NFPA 70B, published by the National Fire Protection Association. Adoption varies by jurisdiction. Confirm the edition your authority having jurisdiction enforces before you run a walk against it.
- Can I run these checklists in RTI?
- Yes. Start a free RTI workspace and load any of the 2 lists (29 items in total). The Photo Gate holds the submit button until every mandatory item is answered and its photos are attached, and approved inspections roll into a branded turnover package with a tamper evident audit trail.
Run these lists with the Photo Gate.
Tag one area, scan it, and the submit stays locked until the photos exist.
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