CONCORD, Mass. – The main switchgear replacement at the Cold Regions Research and Engineering Laboratory (CRREL) in Hanover, New Hampshire, will be completed under the terms of a $389,722 contract recently awarded by the U.S. Army Corps of Engineers, New England District.
Work will be accomplished by Cornerstone Construction Services, LLC, of Woburn, Mass. Construction is scheduled to start on or about Aug. 1, 2013 and take about four months to complete. The contract was awarded on June 12, 2013.
The work consists of supplying and installing a 15kV, three-phase, 6-way one-source and fivetap, 60 Hz, fully dead front, sectionalizing underground distribution switchgear, vacuum fault interrupter (VFI) type, with a main bus rating of 600 amp continuous current and tap rating of 600 amperes.
The contractor is responsible for the complete demolition, removal, and disposal of the existing concrete pad SF-6 switchgear, cabinet, fencing and accessories. The VFI switchgear will be installed on a new pad. The contractor will build a new pad suitable for the new VFI switchgear and install a new fence around the switchgear and pad.
The contractor will install Cable Terminating Cabinets for cable splicing that would allow dead-break circuit sectionalizing point for circuit isolation; provide two sets of 'loopthrough' junctions for each 3-phase circuit for future expansion to future second VFI switchgear; and provide a new ground ring for the new switchgear consisting of buried bare copper conductors and ground rods.
The project will be managed by the Corps and all work will be accomplished under the supervision of a Corps of Engineers Quality Assurance Representative to assure compliance with contract requirements.
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