... on the market demand . 1) selection of tube and tube diameter The cable in the tube are bound to creat a virtual diameter , ... 3d ,taking heat radiation into account . 2) selcetion of cable tube thickness Cable tubes are available in 3mm , 5mm, 8mm, 10mm and ... for deep burial , grooves and sidewalks .General cable tubes, decorative types cable tubes, tube is your best choice . high strength/insulated ...