Electrical Underground - Commercial Electrical Inspection

Underground inspection shall be made after trenches or ditches are excavated and bedded, conductors and/or raceways are installed and before backfill is put in place. Where excavated soil contains rocks, broken concrete, frozen chunks and other rubble that would damage or break the conductors or raceways or cause corrosive action, clean backfill shall be on the job site. Required bonding and grounding that will be concealed must be in place.