Hi ( 1) ASTM (2) ASTM Specifications D624-44 D752-44T except original tensile strength to be 2 2,500 p.s.1i. Tear Test to be 50 p.s.i. thickness per IPCEA General Specifications, Part 7, Table XIV for Direct Burial Cables. 15-33. UNDERGROUND SECONDARY CABLE shall be suitable for direct burial in wet or dry coral aggregate. Cable shall be installed in conduit at entry to buildings or structures or other points indicated on the drawings. a. At point where cable enters conduit suitably pack space around cable to prevent entrance of moisture into conduit. bd. Cable shall be non-metallic armored type in accord with IPCEA Specification for Rubber Insulated Park- way Cables for 600 volt insulation. 15-34. UNDERGROUND CONDUIT shall be painted with an 15-35. Where direct burial of primary cable in a trench asphalt base paint before laying. is indicated, cable shall be laid on 6 inches of fine smooth sand and covered by 3 inches of fine smooth sand. It shall be covered with a 2 inch fully treated plank. 15-36. Minimum cover for underground primary cable shall be three feet zero inches unless otherwise approved. Minimum cover for underground secondary cable shall be two (2) feet zero inches unless otherwise approved. Trench depths shall be increased as required at cross- overs with coaxial cable to provide a minimum separation of one foot zero inches between underground primary and for secondary cables and coaxial cables. In addition to this separation, primary cables must be enclosed in a grounded conduit at least ten (10) feet long at points of crossover with coaxial cables. Trenching, backfill, etc., shall conform to applicable provisions of "Earthwork for Utilities" section of these specifications, 15-37. UNDERGROUND PRIMARY AND SECONDARY CABLE shall be adequately identified by signs warning of the presence of underground power lines. 15-38. TRANSFORMERS: <All transformers shall be single phase, 60 cycles, primary 2400 volts with four 2-1/2% tops below rated voltage, secondary 240/120 volts. 15-7 Indoor