UNDERGROUND ELECTRIC DISTRIBUTION CONSTRUCTION
Base course shall consist of well-graded crushed stone, crushed gravel or crushed concrete (crushcrete) meeting the specification of ASTM C33, graduation 7 (1/2 in. to No. 4).
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At the base of the foundation, fill shall extend 1''-0” beyond the plan dimensions of the foundation, on all sides. Fill shall be distributed to 3''-6” below finished grade at a 1:1 ratio.
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All MTE infrastructure including but not limited to conduits, manholes, box pads, and pull boxes must have a minimum horizontal separation of 36” from gas and water lines.
Substations
While overturning moments in a spread footing are transferred to the base slab through the concrete pedestal, overturning loads on a slab on grade are transferred through the base of the equipment.
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