Bridge crane reasonable grounding device is how

  Steel crane  metal structure must have a reliable electrical connection; work on the rail bridge cranes are generally identified by the wheels and tracks grounding cable is appropriate section of not less than 150 square feet of flat steel, or 10 square feet of copper wire, connected by welding . Under normal circumstances, the crane metal structure and all electrical equipment, metal casing, ducts, cables and metal sheath with carts wheel cab are a reliable connection. So maintenance  overhead bridge crane  grounding should focus on carts orbit and ground wire connection. According to "order" requirements, along with the following four are considered qualified according to device:
   1 crane at any point on earth resistance not greater than 4 ohms;
   (2) ground wire cross-section of not less than "order" requirements, namely steel not less than 150mm, copper not less than 10mm;
   3  hoist crane  grounding wire and grounding, grounding wire with rail carts are necessary for reliable welding;
   4 track two carts at the seams welded rail joint with a metal jumper.