3.9　The Layout Requirements of Earthing Conductor

3.9.1　When earthing conductors is connected to the equipment or the earthing bar，the copper wiring terminals shall be equipped with and be firmly fastened or welded.

3.9.2　The size of wiring terminals shall match with the diameter of earthing conductors.The place where wiring terminals contact with equipment and earthing bars shall be smooth and fastened，without rusting and oxidation.

3.9.3　Flame-retardant cables with their protective coverings of alternate yellow and green signs shall be adopted for earthing conductors.Or the termination where earthing conductors connect with equipment and earthing bars may be wrapped with plastic insulating tapes of alternate yellow and green signs.