S.D. Admin. R. 20:10:39:31
A metal plate used to make an electrical contact with the floor surface or earth must be square, rectangular, or round, and have a surface area equal to or greater than 16 square inches. A weight of not less than 20 pounds is placed on the metal plate. This weight is applied evenly across the metal plate and not to the adjacent floor surface or earth. The metal plate is placed a minimum distance of 12 inches from any metal equipment making contact with the floor surface or earth. The surface of the metal plate that will make contact with the floor surface or earth must be clean and free of corrosion before use.
When the metal plate is placed on a floor surface, the surface must be flat. The floor surface is cleaned with a wire brush to remove debris that may add excess resistance, and then cleaned with water. A paper towel or similar material soaked in saltwater is placed between the metal plate and the floor surface. When the metal plate is placed on the earth, the surface must be flat. Any debris must be removed and water added to the area, if necessary, to dampen the soil.
S.D. Admin. R. 20:10:39:31
General Authority: SDCL 49-47-2.
Law Implemented: SDCL 49-47-2, 49-47-3.