T&D World Magazine
The boring pipe is visible beneath the ground in this section that was first excavated to remove rock
The boring pipe is visible beneath the ground in this section that was first excavated to remove rock.

Potomac Edison Replaces Underground Cable

Company to Spend $4.5 Million in Maryland Service Area on New Infrastructure

As part of its ongoing efforts to strengthen the durability of its electric system and enhance service reliability for its customers, Potomac Edison, a FirstEnergy Corp. utility, is proactively replacing approximately 22 miles of underground distribution cable throughout its Maryland service area at a cost of about $4.5 million.

Much of the cable replacement work is being done in residential subdivisions that were built years ago using an underground electric system instead of using overhead wires. 

"We are replacing sections of underground cable in areas where outages have occurred with new wires encased in PVC conduit to better protect the equipment," said James A. Sears, Jr., FirstEnergy's president of Maryland Operations and vice president of Potomac Edison.  "While underground electrical equipment is in many ways better protected from the elements than overhead wires, if an outage does occur it often takes longer for our crews to pinpoint where the underground problem is and make repair."

A boring machine operator tunnels beneath the ground to create a space for underground conduit and electric distribution cable as part of Potomac Edison’s work to replace aging electrical infrastructure.

Rather than digging trenches through yards and driveways when replacing underground cable, utility contractors often use specialized equipment to bore horizontally beneath the ground.  The equipment is able to change direction underground and bore laterally as far as 500 feet without surfacing, depending on soil composition.  Once the boring is completed, the conduit and cable are fed through the underground openings.  

While underground electric equipment is not exposed to tree-related damage, lightning strikes on interconnected overhead equipment and other conditions can still cause outages.  Underground cables housed in conduit are easier for line crews to repair, which can shorten the duration of service interruptions.

Outage data is used to prioritize the areas where the underground cable is replaced.  For 2015, Potomac Edison's underground replacement work includes these projects:

  • Loch Haven subdivision, near Route 75 between Green Valley and Hyattstown, Frederick County, $325,000, completed.
  • Regina Drive, Lewisdale Road, between Green Valley and Hyattstown, Frederick County, $240,000, completed.
  • Hillcrest Drive near Route 40, Frederick City, $150,000, completed.
  • Sherwood Forest subdivision, off Route 75 near New Market, Frederick County, $250,000, under construction.
  • St. Johns Rock Road (residential and auxiliary buildings for a wind farm) near Old Frostburg Road, Finzel, Garrett County, $110,000, completed.
  • Bethesda Church Road off Woodfield Road, Damascus, Montgomery County, $140,000, under construction.
  • Goshen School Road off Huntmaster Road, Gaithersburg, Montgomery County, $73,000, completed.
  • Doub Meadow subdivision, Jay Dr., Hagerstown, Washington County, $135,000, under construction.
  • Garden Spot subdivision, Maugansville, Washington County, $185,000, under construction.
  • Cool Hollow subdivision, Boonsboro, Washington County, $75,000, under construction.
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