LT Panel board fctory fabricated along with electrical items, as per Tech Specification, Lightening Conductor asper Tech, Sanction, Crushed Stone Aggregate 20 mm graded, confirming to IS 383 970, 2nd revision, from natural sources, Coarse Sand confirming to IS 383 1970, from, natural sources, Hard core of broken stone aggregate of, size 45 63 mm conforming to IS 383 1970 as WMM.