Intermediate support lines underground to avoid excessive shooting at the tip of the wires, plus the use of "dog" means to reduce the friction inside the ducts with greatly improving shooting, avoiding damage to conductors . The "dog" must be placed before the difficulties, eg before a strong curve. Can also be placed at the exit of the coil and lubricate later. Thanks to the dog clutch of inertia, the dog automatically adjusts to the speed of fire of the main machine, without having to be an operator with the machine permanently. To facilitate placement and removal, the dog is easily opened to remove the cable already installed. MESEGUR, SL 2011. The reproduction is prohibited unless consent totally or partially by the owner of the Web / / Designed by Admicove. .