PDU Load Balancing Review

Inspection template for verifying power distribution unit loads remain within rated capacity and are balanced across redundant feeds in a data center environment.

Inspection Scope and PDU Identification

• PDU asset ID and location recorded
  Record the PDU identifier, room/row/rack location, and feed designation.
• Inspection date and inspector recorded
  Capture the date and time of the inspection.
• PDU nameplate rating verified
  Confirm the PDU nameplate rating is legible and available for comparison against measured load.
• Single-line or circuit reference available
  Confirm the applicable circuit or single-line reference is available for the PDU and its redundant feeds.

Load and Capacity Verification

• Measured total load is within rated capacity
  Record the measured total load on this PDU and verify it does not exceed the rated capacity.
• Peak load margin remains available
  Record the estimated remaining capacity margin after normal operating load and expected growth.
• Phase loading is balanced across phases
  Assess whether phase loading is reasonably balanced and does not show a significant imbalance that could indicate a deficiency.
• No overloaded branch circuits or receptacles observed
  Confirm no branch circuit, receptacle, or outlet on the PDU shows signs of overload, overheating, or nuisance tripping.

Redundant Feed Balance

• A feed and B feed loads are balanced
  Record the load balance between redundant feeds and verify the difference remains within the site's acceptable limit.
• Redundant feed is present and energized
  Confirm both redundant feeds are present, energized, and supplying the intended load path.
• Transfer or failover condition reviewed
  Verify the PDU load distribution supports redundancy during a feed loss or transfer condition without exceeding capacity.

Physical Condition and Electrical Safety

• No visible damage, overheating, or arcing evidence
  Inspect for discoloration, melted insulation, scorch marks, unusual odor, or other signs of overheating or arcing.
• Cables and connectors are secure and strain-relieved
  Confirm power cords, plugs, and connectors are fully seated, secured, and not under tension.
• Access to PDU is unobstructed
  Verify the PDU is accessible for inspection and emergency service without obstruction.
• Lockout-tagout status verified for any maintenance work
  If maintenance is in progress or planned, confirm lockout-tagout controls are applied per OSHA 1910.147 before exposure to energized parts.

Corrective Actions and Sign-off

• Deficiencies documented with corrective action
  Document any deficiency, non-conformance, or critical item failure and assign the corrective action, owner, and due date.
• Escalation to facilities or electrical lead completed
  Confirm any critical item failure or out-of-limit condition has been escalated to the appropriate facilities or electrical lead.
• Inspector signature captured
  Inspector signs to confirm the review is complete and accurate.