The surface of the exposed earth wire shall be painted with a green and yellow stripe with an equal width of 15-100 mm. The entire length of each wire is marked as each part or only the contact part. When self-made muffler tape, two-color tape should be used. The center line should be marked with light blue.

If the lap (welded) joint is made of flat steel, the length of lap (welded) muffler lug joint is twice the width (if the flat steel to be welded has different width, the larger one shall prevail), and at least three sides shall be welded. When the joint (welding) material is round steel, the joint (welding) length shall be 6 times of its diameter (whichever is larger), and shall be welded on both sides; when there is only one side welding, the joint (welding) length shall be 12 times of its diameter; when the joint (welding) length is a mixture of round steel and flat steel, the joint (welding) length shall be determined according to the diameter of round steel. The flasher, downlead, grounding device and grading ring shall be connected by welding or other reliable methods, and the transition resistance shall be less than 0.03 ω. The welding seam shall be filled with solid without slag, porosity and penetration. The bolt connection shall be firm and reliable, and measures shall be taken to prevent loosening. The special pipeline of muffler shall be washed to be qualified, the opening and closing of valve shall be smooth and continuous, and the switch state and position feedback signal of automatic valve shall be correct. The instruments that detect the flow, pressure, liquid level and water quality in the system must pass the calibration, and can set the parameters correctly, and the corresponding signals can also be output correctly. The rotation direction of the impeller of the pump is correct, and there should be no abnormal vibration and noise during operation. The electrical parameters of the motor of the pump and the temperature rise after 2 hours of continuous operation should meet the requirements of the technical documents of the equipment. The flow and head of the pump should meet the design requirements. The selection of airdrop capacity is reasonable, and the current limiting setting of thermal relay conforms to the actual load of the equipment.