I am having a submersible pump installed in a drilled well. What are the burial requirements for the cable from the house to the well?
The Code requires non metallic sheathed cable to be buried at least 600 mm (24") below non-vehicular areas and 900 mm (36") below vehicular areas. An example of a vehicular area is a laneway, an example of a non-vehicular area is a lawn.
The Code permits these depths to be reduced by 150 mm (6") where mechanical protection is placed in the trench above the cable.
Direct buried cables shall also be surrounded by at least 75 mm (3") of 6 mm (1/4") nominal screened sand or earth.
A suitable electrical warning marker tape shall be buried along and above the cable route and be located approximately halfway between the cable and finished grade.
Where mechanical protection is used for reduced depth, it shall consist of one of the following and, when in flat form, shall be wide enough to extend at least 50 mm beyond the conductor, cables, or raceways on each side:
(a) Treated planking at least 38 mm thick; or
(b) Poured concrete at least 50 mm thick; or
(c) Concrete slabs at least 50 mm thick; or
(d) Concrete encasement at least 50 mm thick; or
(e) Other suitable material.
Ontario Electrical Safety Code Rule 12-012.