2: the burying of Anti-static ground wire
(1)In the led display factory, the building lightning rod and the building of reinforced concrete are welded together properly grounded, when lightning occurs, and the whole building ground floor will become the high voltage high current discharge point. The discharge of ground 20M range will have" step voltage", namely in this range is no longer desired zero potential. In addition, the three-phase power supply zero line since it is not possible to absolute balance and will have unbalanced current generated in the zero line and flows into the ground, the anti-static burying ground wire should be away from buildings and equipment place to 20 meters away.
(2)The ways of burying wire to led display screen: in order to ensure the reliability of grounding, there should be at least three points on the ground, namely, every 5m dug a 1.5m above pit deep, put the 2m above iron into the pit, then use 3mm thick copper wire welding this three points together, with 16m2 insulated copper wire welding is introduced into the indoor as trunk.
(3) The led displays manufacturer should impose appropriate charcoal powder and industrial salt in the pit, to increase the conductivity of the soil. After landfill, measuring with a ground resistance tester, earth resistance should be less than 4Ω, and tested at least once a year.