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What to do About Power Quality Problems


  1. To help track quality problems, keep a detailed log of when events occur.
  2. If the problem is with a specific piece of equipment or software, refer to the instruction manual and contact the manufacturer to determine if they can help identify the problem.
  3. Have a qualified electrician check the wiring and grounding
    • Verify proper wire sizing for your specific loads (for three-phase systems in older buildings, neutral wires may be smaller and not adequate for today's electronic loads).
    • Check all connections for tightness and clearances.
    • Check that your service is properly grounded to National Electric Code, Article 250.
    • Verify there is only one neutral-to-ground bond at the main service entrance and none in downstream panels or receptacles.
    • Check proper outlet wiring, and verify that your loads are properly balanced and no circuits are overloaded
  4. Determine if the disturbance is caused by other equipment on the same circuit, isolate sensitive equipment, or move it to a dedicated circuit. Contact a qualified electrician for assistance. If you think that Electrical Noise or Interference is causing a problem, when the static occurs, simply disconnect the electric-powered items in your home or building one at a time. Proceed to turn off circuit breakers one at a time. When the static stops, you've found the issue. You can also try moving the equipment that's affected to an alternate location in your building to help determine the problem.
  5. Check facility operation. Switching on and off of high current electric loads or loads that are on very lengthy building circuits can be a cause of voltage sags.

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Maine Public Service District Bangor Hydro District
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Emera Maine provides electric delivery service to two areas – the Bangor Hydro District and the Maine Public District.

  • The Bangor Hydro District includes Hancock, Piscataquis and Washington Counties and most of Penobscot County.
  • The Maine Public District serves Aroostook County and a small piece of Penobscot County.

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