Medium Voltage Ductbank Burial Depth and SLope

pete25

Member
Is there an industry standard for the minimum depth and slope of medium voltage cable ductbanks? I am aware of the NEC article 310 requirements but wanted to see if there are other standards that I can reference.
 
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Typical is 24" minimum to top cover with concrete encasement, one sack of slurry with red dye or red magnetic stripping (detectable underground tape).
 
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