Main keywords for this article are Direct Buried Duct Installation guide, Underground Cable Trench Specification, Cable Trench Standard, Cable Trench Drawing, Underground Installation Details.
UNDERGROUND INSTALLATION DETAILS
CONDUIT STUB-UP
CONDUIT DUCT BANK
NOTES (CONCRETE REINFORCED DUCT BANK):
1. CONCRETE DUCT BANK SHALL BE PLACED ON 50mm MUDMAT AND POLYETHYLENE SHEET LINER ON TOP OF MUDMAT.
2. PROVIDE CONCRETE WITH MINIMUM COMPRESSIVE STRENGTH OF 16MPa AT SEVEN DAYS AND 25MPa AT 28 DAYS. SILICA FUME SHALL BE USED AS AN ADMIXTURE.
3. REQUIREMENTS SPECIFIED IN SECTION 6.2.18 CONCRETE, OF SPECIFICATION Electrical conduit Installation Aboveground & Undergroud Techniques SHALL APPLY, INCLUDING ITEM C ABOUT RED PIGMENT.
4. ALL EXPOSED SURFACES SHALL BE COATED WITH WATERPROOF MATERIAL. POLYURETHANE COATING SHALL HAVE A RED COLOR .TO IDENTIFY THE CONCRETE AS ELECTRICAL DUCT BANK.
600V OR LESS (UNPAVED AREAS ONLY)
35kV TRENCH (UNPAVED AREAS ONLY)
5kV OR 15kV TRENCH (UNPAVED AREAS ONLY)
NOTE: WHERE CABLE AMPACITY STUDIES HAVE BEEN PERFORMED FOR THE SPECIFIC INSTALLATION, CABLES MAY BE INSTALLED IN MULTIPLE TIERS AND SPACED LESS THAN 200mm.
TYPICAL LOAD BEARING 35kV CABLE TRENCH AT ROAD CROSSING
TYPICAL ROUTING MARKER
NOTES:
CLEAN METAL SURFACE AND PAINT WITH 2 COATS PRIMER AND 2 COATS YELLOW ENAMEL. LETTERING AND SIGNS SHALL BE PAINTED OR SCREENED WITH BLACK ENAMEL.
2. CORNER OF MARKERS SHALL BE ROUNDED AND EDGES SMOOTH IN ORDER TO AVOID PERSONAL INJURY.
3. MARKER PLATES SHALL BE PLACED AT THE START AND END OF RUNS. AT INTERVALS NOT TO EXCEED 50000mm ALONG DUCT BANKS OR 30000mm INTERVALS ALONG DIRECT BURIED CABLE TRENCHES. ON TURNS MARKER PLATES SHALL BE PLACED AT INTERSECTION OF LINES. ARROW SIGN SHALL POINT DIRECTION OF ROUTES.
4.IN LANDFILL AREA, STEEL BARS SHALL BE HAMMERED IN PLACE. CONSIDERING CLEARANCE TO BURIED CABLES. IN PAVED AREA, MARKER PLATES SHALL BE SET IN PLACE WITH TOP OF MARKER 15mm ABOVE FINISHED GRADE.
5. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS UNLESS OTHERWISE NOTED.
TYPICAL LOAD BEARING CABLE TRENCH AT ROAD CROSSING AND IN CONCRETE PAVED / GRADED AREAS
TYPICAL INSTRUMENT CABLE TRENCH PAVED OR UNPAVED AREAS
TYPICAL INSTRUMENT CABLE CONCRETE TRENCH PAVED AREAS
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