The main problems in the current construction of electrical engineering construction: professional engineering contractor package is more confusing. The material market is chaotic and the product quality is poor. The installation of professional personnel on the construction site is seriously inadequate. The design changes are not in sync with the on-site construction; drawing audits and program planning are not deepened. The construction process is confusing and grabbing is common. Data archiving is not complete, fill in non-standard. Then we need a lot of better and better practices for construction workers to refer to and implement. Today we have a look at the problems still exist in line pipe laying and some precautions.
common problem
Roof lightning rod is not straight, the tail is not closed, the bracket is not fixed
Roof metal railing lightning protection is not standardized
Welded metal wall is not standardized
Equipment grounding not grounded; metal hose connection without jumper
Equipotential terminal row size is too small, multiple strands are not connected to tin
The bathroom socket is not connected with the equipotential tank, and the equipotential tank conflicts with the water pipe.
The bathroom socket is not connected with the equipotential tank, and the equipotential tank conflicts with the water pipe.
Bathroom radiator equipotential bonding dead line
Should pay attention to the problem:
1, lead off the line:
1) In addition to design requirements, tie-in steel structural members, concrete girders, column steel bars and steel reinforcements that serve as deflectors shall be connected using civil engineering methods of tying or screw fasteners, and non-thermal processing connections.
2) When using steel reinforcement in a building's reinforced concrete as a lightning deflector, the following requirements should be met:
a. When the rebar diameter is ≥ 16mm, two rebars should be used as a set of deflectors.
b. When the rebar diameter is ≥10mm, four rebars should be used as a set of deflectors.
c. Downline shall be marked during construction and shall have concealed acceptance records.
3) Set the deflector line to prevent the contact voltage and the side flashover voltage when the personnel can stay or pass the area; the distance between the insulation layer of the wall or wall of the deflector installation and combustible materials should be greater than 0.1 m.
2, grounding device:
1) The connection of the grounding body (wire) should be lap welding. The welding multiple should meet the specification.
2) There should be grounding trunks and grounding terminals in the elevator shaft and power distribution room.
3) The grounding trunk in the electric shaft of a high-rise building shall be equipotentially connected to the adjacent slab reinforcement at every 3 floors.
4) The connection plates for measuring, connecting the artificial grounding body and making equipotential bonding should be set above the ground in accordance with the design requirements.
3, equipotential bonding
1) Total equipotential connections should be made at the building entrance. The building equipotential bonding trunk and grounding devices shall have direct connection of not less than two places. Metal connections to and from buildings should be equipotentially connected.
2) The bathroom with the requirements for installing bathing equipment should do partial equipotential bonding. Local equipotential bonding should include metal water supply and drainage pipes in the toilet, metal
Bathtubs, metal washbasins, metal heating pipes, metal radiators, PE lines for bathroom power outlets, and building reinforcement meshes.
3) High-rise building metal plumbing pipe wells should be used for equipotential bonding every three layers.
4) The total equipotential tank and the local equipotential tank should use the standard equipotential box with the copper terminal row finished product instead of a junction box.
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