An underground electrical trench maintains a minimum twelve inch width and a depth between thirty-six inches minimum and forty-eight inches maximum below finished grade. The excavation is formed in undisturbed earth with clean backfill free of rocks larger than four inches in diameter, while material immediately surrounding the conduit passes through a three-quarter inch sieve or consists of sand without sharp objects. Schedule forty PVC conduits rest flat on a uniform trench bottom. A marker tape with tracer wire is installed directly over power or data conduits at the specified minimum depth below grade.
TRENCHING KEYED NOTES: T5 T7 T8 T2 T3 T4 T1 12" MIN. 36" MIN. 48" MAX. 4. ALL CONDUITS SHOWN SHALL BE SCHEDULE 40 PVC. REFER TO KEYED NOTES ON PLANS AND RISER DIAGRAMS FOR QUANTITIES AND SIZES OF CONDUITS. 5. UNDISTURBED EARTH. 6. MARKER TAPE WITH TRACER WIRE LABELED, "CAUTION BURIED DATA/COMMUNICATION CONDUIT BELOW" DIRECTLY OVER DATA/COMM CONDUITS. 7. TRENCHES SHALL BE A UNIFORM DEPTH FOR ENTIRE LENGTH OF TRENCH SO CONDUITS CAN SIT FLAT (HORIZONTAL) WITH THE GROUND. 8. FINISHED GRADE. T# 1. MARKER TAPE WITH TRACER WIRE LABELED, "CAUTION BURIED ELECTRIC CONDUITS BELOW" DIRECTLY OVER POWER CONDUITS 6" MINIMUM BELOW GRADE. 2. CLEAN BACKFILL CONTAINING NO ROCKS LARGER THAN 4" DIA. 3. BACKFILL MATERIAL WITHIN 4" TO 6" OF CONDUIT SHALL PASS THROUGH A 3/4" SIEVE FRAME OR SAND WITHOUT ANY SHARP OR FOREIGN OBJECTS.
Members view this detail in full resolution, download the CAD files (SVG, PDF), and can adapt it in the built-in CAD editor — export DXF, DWG, or PDF.
Start membership