Electrical Duct Bank and Underground Conduit

The scope includes route coordination, survey layout, utility locates, excavation, trench support, base preparation, conduit and spacers, reinforcing, grounding interfaces, concrete encasement, maintenance holes or handholes, mandrel testing, pull rope, plugs, labels, backfill, density testing, as-builts, and restoration. Harrowgate prices the issued electrical and civil design.

Concrete encasement holds the conduit array in its designed geometry and provides mechanical protection where loading, crossings, utility requirements, or system importance demand it. The electrical design establishes concrete cover, strength, reinforcing, and duct separation. Harrowgate builds and inspects the bank to those dimensions before any portion is concealed.

After the bank has cured and structures are complete, Harrowgate cleans each duct, passes the specified mandrel, installs the required pull rope, verifies identification, and seals the ends. Failed runs are investigated and corrected before handover. Test records link every conduit to its origin, destination, size, and intended service.

Harrowgate uses the specified spacers, secure supports, staged assembly, restrained stub-ups, controlled discharge, and placement methods that limit buoyancy and impact. Workers observe the array while concrete is placed. Cover, separation, bends, and entry positions are checked at hold points, and any movement is corrected before the concrete reaches final set.

Ontario Regulation 164/99 adopts the current Ontario Electrical Safety Code, consisting of CSA C22.1:24 and Ontario amendments. Distribution systems also engage O. Reg. 22/04 and utility requirements. Excavation follows O. Reg. 213/91. Harrowgate coordinates the applicable design, inspections, utility rules, and civil specifications for each project.

Yes. Harrowgate stages excavation, traffic, access, trench support, temporary plating where designed, concrete placement, cure time, backfill, and pavement restoration around operating constraints. The crossing design accounts for loading and cover. We coordinate shutdowns and access windows with the owner and maintain the approved route through the work zone.

Provide electrical and civil plans, duct schedules, sections, structure details, utility standards, concrete and reinforcing requirements, grounding details, inspection requirements, geotechnical information, route constraints, traffic staging, restoration limits, and schedule. Harrowgate reviews quantities and interfaces instead of pricing conduit length without the supporting civil work.