Free commercial diagnostic guide
Commercial three-phase power checklist
Phase loss, voltage imbalance, loose connections, failed protection, and equipment faults can look similar from the production floor. This checklist helps Jacksonville facility teams document the event, protect critical operations, and prepare for qualified diagnostics.
Three-phase diagnostics can involve lethal voltage and arc-flash hazards. Inspection, testing, and repair belong to qualified personnel using the facility’s electrical-safety program.
Capture what changed
- List affected motors, HVAC units, pumps, refrigeration, compressors, conveyors, and control systems
- Record alarms, fault codes, nuisance trips, reduced output, overheating, unusual sound, or failure to start
- Note whether the issue began after a storm, outage, utility work, equipment installation, or tenant change
- Identify whether the entire facility, one panel, one area, or one piece of equipment is affected
- Preserve equipment service reports and timestamps so electrical and mechanical contractors can compare events
Protect people and operations
- Use the facility’s approved shutdown and lockout/tagout procedures—never improvise inside energized equipment
- Stop equipment showing smoke, arcing, burning odor, severe vibration, or abnormal heat when it is safe to do so
- Do not repeatedly reset breakers, overloads, drives, or control equipment without identifying the fault
- Communicate impacts to life safety, refrigeration, IT, security, medical, process, and tenant operations
- Keep electrical rooms, disconnects, and service equipment accessible to authorized responders
Prepare for qualified diagnostics
- Provide service voltage, phase, panel directories, one-line drawings, equipment nameplates, and recent load additions
- Confirm whether utility power and building distribution both need evaluation
- Ask for documented phase-to-phase and phase-to-ground measurements appropriate to the equipment and system
- Review connections, overcurrent protection, motor protection, controls, conductors, and loading—not only the failed machine
- Separate the immediate repair from recommended monitoring, maintenance, capacity, or power-quality improvements
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Bolt Electric supports Jacksonville offices, retail, restaurants, warehouses, managed properties, and light-industrial facilities with diagnostics, repairs, and planned upgrades.
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