Exploring the quality control of building electrical engineering projects

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1 Common Quality Problems in Electrical Engineering Projects and Their Solutions 1.1 Cable Laying During construction, it is common to encounter internal nodules forming in the butt-welded connections of thick-walled steel pipes, which can damage the insulation layer when cables are passed through them； Thin-walled steel pipes can suffer from burn-through during welding, and when embedded in concrete, they allow mortar to seep in, leading to problems such as blockages in the ducts. All of these can create security risks. Therefore, when joining thick-walled steel pipes, sleeve welding is required, and the welds must be full and dense ； For thin-walled steel pipes, it is required to use joint seals to prevent moisture from entering the pipe and causing the insulation layer of the wires inside to age. Currently, for the construction of some electrical pipelines, using JDG pipes or new types of waterproof flexible electrical conduits represents an ideal solution. 1.2 Installation of distribution boxes: Large holes are cut in some metal distribution box bodies using electric and gas welding ； The wiring ducts inserted into the box are of varying lengths and not straight ； The position of the conduit entering the box can be arranged arbitrarily, and the wiring behind the connector is messy ； The neutral and protective ground wires of the enclosure are not connected to the busbar. Therefore, it is necessary to examine and verify the qualifications, scale, and certification status of distribution box manufacturers, impose strict technical requirements on the products leaving the factory, and strengthen the inspection process. Circular holes should be made in the access channels for wires entering and leaving the distribution box; an hole punch should be used to create these holes, or the holes can be drilled and then filed to remove any burrs, so as to prevent damage to the electrical insulation layer when wires are passed through ； When leading the wire conduit into the distribution box, it should be kept flat, and the end of the conduit should be secured with a sleeve to prevent it from tilting ； The lead wires introduced should have sufficient slack for maintenance purposes; they should be arranged in bundles, and especially in cases of multiple circuits, there should be no crossing of the wires ； No more than 2 wires shall be connected to the same terminal, and it is necessary to ensure that components such as anti-loosening washers are available in sufficient quantity. 1.3 Lighting fixtures: Some building lighting devices are installed at incorrect positions ； Problems such as significant deviations in the levelness and straightness of rows of lighting fixtures. These phenomena are caused by problems with the position of the embedded light boxes, resulting in deviations, and no effective corrective measures were taken during installation. Therefore, before installing the lighting fixtures, it is necessary to identify the center point, detect and correct any deviations promptly, and adhere strictly to the construction specifications. During installation, guidelines can be used to ensure that the vertical, horizontal, and diagonal positions of the lighting fixtures are all on one straight line, thus achieving perfect alignment. 1.4 Lightning protection grounding: Some operators lack a strong sense of responsibility, or their welding skills are insufficient, resulting in poor welding techniques. To prevent such phenomena, it is necessary to enhance the sense of responsibility among operators and improve welding skills; missing welds or spot welds are not allowed, nor is it permissible to use rebar as a substitute for round steel for lap joints. The length of the double-sided lap weld must meet the specification requirements. 1.5 Pre-installation of outdoor service pipes: First, supervisors must strictly enforce the inspection process for materials entering the site; thick-walled steel pipes or PVC pipes that meet standard specifications should be used. The elbows used to attach the steel pipes to the wall must be created using an elbow bending machine – welding is not allowed. After bending, the steel pipes should not have any cracks or dents. When embedding PVC wire conduits, do not use pliers to flatten or bend the ends of the conduits; instead, use plugs that match the conduit diameter to cover them and tie them down with tape. 2 Quality control strategies for building electrical engineering projects 2.1 A high-quality construction team is an important guarantee for the quality of electrical engineering projects. The quality of a project is determined by the combined efforts of all those involved in its construction, including management and technical personnel, operators, and service staff; they are the key factors that influence the project quality. Therefore, it is necessary to strengthen quality and ideological education, as well as professional ethics training, for electrical technology managers and workers, so that they adopt a mindset that places quality first and prevention at the core, and carry out electrical installation tasks with high quality and in full compliance with standards, taking ownership of their work. The worker teams are the grassroots organizations that are directly involved in on-site construction. Among the electrical engineering workers, professional technicians holding electrician certificates should account for no less than 50% of the total number of workers involved in the construction. Furthermore, a practical job responsibility system for workers should be established based on the nature of the electrical engineering field; clear division of tasks and defined responsibilities are essential, as having a clear understanding of these aspects is fundamental to ensuring the quality of the project. Electrical engineers should have a strong sense of responsibility for the quality of the electrical projects they are in charge of, making full use of their professional skills to carry out thorough and meticulous management of aspects such as the technology, quality, approvals, schedule, and safety related to those electrical projects. A good electrical engineer must first possess comprehensive professional knowledge; not only should they be familiar with the various strong-current systems and their construction standards, but they also need to have extensive knowledge and experience in various weak-current systems ； At the same time, it is also necessary to be familiar with various relevant design, construction, and acceptance standards, as well as national, local, and industry standards, as well as the formal and “informal” regulations set by the relevant regulatory authorities. There are many more of these than construction standards, they cover a wide range of areas, and they are updated frequently. Organize electrical construction workers to conduct regular or irregular quality inspections, carry out frequent dynamic analyses of project quality, and take effective measures to address critical areas as well as existing common quality issues. Electrical quality management personnel at all levels should establish quality responsibility systems, carry out their tasks accordingly, and assume their respective responsibilities to create the conditions necessary for ensuring project quality. 2.2 Good communication and coordination among the project owner, the design unit, the supervision unit, and the construction unit are essential prerequisites for ensuring the quality of electrical work; it is necessary to organize thorough reviews of the drawings and technical briefings. Design drawings serve as the specific basis for construction work. Before starting construction, the project owner shall organize the design, supervision, construction, and other participating parties to conduct a thorough review of the drawings. To ensure that all parties understand the design intent, process flow, construction methods, and quality requirements specified in the drawings, so that issues can be identified promptly and suggestions can be made, allowing any problems present in the drawings to be corrected and addressed before construction begins. During the drawing review, it is important to focus on the key points; first, check whether the design meets the functional requirements and regulatory standards ； Next are whether the product selection and design scheme are economically reasonable, and whether the construction site can meet the construction requirements. It is necessary to understand and master the settings of various systems so that they can operate in sync with the main construction work; this prevents the need to install these systems after the main structure has been completed, which would make construction more difficult and could cause damage to the building as well as lead to waste. Especially regarding the design of various systems in building intelligence, implementation should be considered carefully due to the high degree of complexity of these systems, rapid product updates, and significant investment risks. It is necessary to examine whether the design reflects the principles of economic efficiency and construction convenience, and whether many mature technologies and materials have been utilized in this project. For example, in the design of high-rise residential buildings, it is not necessary to use fire-resistant wiring cables in some areas; flame-retardant cables are sufficient for fire protection purposes, which can help save a considerable amount of material costs ； Try to replace steel pipes with flame-retardant PVC conduit or galvanized wire conduit, which saves on investment and facilitates construction. 2.3 The quality of equipment and materials constitutes the material basis for determining the quality of electrical engineering. Building materials are an important part of the physical structure of construction projects, and they represent a crucial aspect in the management of such projects. In construction, proper management and use of building materials ensure the quality of the finished buildings, which in turn helps to reduce construction costs. Therefore, proper material management is of great significance for accelerating construction progress, ensuring project quality, reducing project costs, and improving efficiency. 2.4 Details determine the success or failure of a project, and the construction process is the key aspect of quality management. Before a project begins, electrical engineers should first become familiar with the electrical construction drawings, and together with civil engineering technicians, they should check these drawings to identify areas where there is overlapping work. Based on the civil engineering construction schedule, proper technical and material preparations must be made prior to construction. At the same time, it is necessary to actively participate in the reinforcement inspection prior to each concrete pouring, to check whether there are any omissions in the pre-installed pipes, wires, and components, and to ensure that their installation quality meets the required standards. Thoroughly review the construction organization plan and construction methods proposed by the contractor. The construction organization design is a technical document that guides the entire construction process, and it represents the specific measures for implementing the construction drawings. By formulating comprehensive and thorough organizational plans for construction preparation, construction organization, construction techniques, and construction economics, it guides construction activities, thereby accelerating the construction progress, shortening the construction period, reducing losses, saving investment, and improving economic efficiency – with the ultimate goal of achieving optimal results from capital investment in infrastructure projects. Strengthen technical management during the construction process. Technical management during the construction process should be applied throughout the entire period from project construction to commissioning. The construction process is a key aspect of quality management; it is essential to follow the plans meticulously. The construction drawings that have been reviewed are the main guidelines for construction, and these drawings must not be altered arbitrarily. Electrical construction standards and operating procedures serve as the benchmarks for workmanship. During the construction process, each step must be carried out in accordance with these standards and procedures, and any quality issues identified must be addressed immediately to avoid potential problems and to prevent quality accidents from arising. At the same time, it is necessary to strictly control the procedures for design changes during construction, regulate the behavior of all parties, and adhere to the operational process that requires completing the necessary procedures first before proceeding with any work. Reposted from China Forum: Although electrical engineering construction is technically complex and requires high standards in terms of quality, as long as the construction unit makes adequate technical preparations before starting work, follows the relevant **standards strictly during construction, and implements rigorous quality control procedures, the construction quality can still be ensured. This will in turn help to meet the design requirements and the expectations of the client regarding project quality, schedule, and cost control. This article is reprinted from a published paper; the original address is http://www.zhjscn.com/lunwen/dianli/1040.html. Please indicate the source when reproducing it