(1) Replace the lightning rod (net) and its down conductor with structural steel, and the galvanized welding damage layer does not brush the antirust paint.
(2) The length of the connection of the down conductor, the equalizing ring and the lightning protection belt is not enough, the flat steel is less than twice the width, the round steel is less than 6 times the diameter, the welding is not full, and the welding has slag inclusion, welding, and virtual Welding, biting meat and pores did not knock out defects such as welding slag.
(3) The lead wire of the grounding body is not treated with anti-corrosion treatment. When galvanized flat steel is used, the welding part of the lead wire is not brushed with anti-corrosion paint.
(4) When the grounding wire crosses the deformation joint of the building, no compensator is added, and the protective pipe is not applied when passing through the wall.
(5) Roofing metal objects, such as pipes, ladders, flagpoles and equipment casings, are not connected to the roof lightning protection system.
(6) The bolted connecting piece is untreated, the galvanized or tinned surface is incomplete, and the piece is not in close contact with the piece.
(7) The branch line of the grounding (zero) of the electrical equipment is not connected to the grounding trunk, and is connected in series or through the bracket and the foundation channel.
(8) The installation depth of the grounding body is not enough, and the height from the ground is less than 0.6 m.
(9) The lightning protection belt is seriously deformed, the bracket is detached, the spacing between the lower points is too large, and the wiring outside the lower line is not reserved.
(10) Replace the PE wire and equipotential bonding with a metal pipe, and the diameter of the cross-ground wire of the bridge, metal pipe, electrical cabinet, box, door, etc. is insufficient.
(11) When the TN-S system is used in the multi-storey residential building, the incoming line is not repeatedly grounded at the main meter box, and the MEB is not in the distribution room as required.
(12) The socket grounding wires are connected in series with each other. The fixtures with a mounting height of less than 2.4 m can be close to the ungrounded metal conductors.
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