Safety And Environmental Protection Measures For Piercing Branch Cables In High-rise Shafts

8.1 Temporary power supply at the construction site shall be strictly implemented in accordance with the relevant provisions of the "Technical Regulations for Temporary Power Supply Safety at Construction Sites" (JGJ46-2005). The cable line shall adopt the "three-phase five-wire" wiring method. Electrical equipment and electrical lines must be well grounded, and the distribution box shall be equipped with a leakage protection device.
8.2 Mechanical operation shall be strictly implemented in accordance with the relevant provisions of the "Technical Regulations for Safety in the Use of Construction Machinery" (JGJ32-2001).
8.3 Electrician operators must be certified to work.
8.4 Safety helmets must be worn when there are high-altitude cross operations. When installing cable piercing connector branch cables, no one should stay below to prevent falling objects from injuring people.
8.5 When using hand-held power tools, insulating gloves should be worn, and there should be reliable grounding devices. Hand-held power tools should have dedicated electrical switch boxes and leakage protection devices.
8.6 When laying cables, there should be a dedicated person to direct, and cables should not be laid at will to avoid cable rolling and injuring people or causing cable crossing confusion.
8.7 When using a megohmmeter to test the insulation of cables, discharge measures should be taken immediately to avoid injury.
8.8 The installed cable ipc connector branch cables and cables should be protected. If necessary, a special person should be assigned to supervise or a signboard should be set up for warning.
8.9 Comply with the rules and regulations on fire prevention and waste disposal. Packaging products and waste should be classified and stacked, and stored and handled reasonably according to designated locations and plans.
8.10 Civilized construction, clean materials after work.
9. Benefit analysis
9.1 Under the same load and installation conditions, the material cost of using puncture branch cables is much lower than that of using pre-branch cables. Especially for low-capacity systems, the material cost reduction is more obvious when using electrical piercing connector with a unified current level as the cable branching method. In addition, it is easy to install and saves on-site construction labor, and the total construction project cost will be greatly reduced. Under normal circumstances, the project cost of using insulation connector is 20%~30% lower than that of pre-branch cables.
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Project example: Taking the supporting project of Nanhua Kangcheng Building 3 as an example, the cost of the cable laying project for the residential part of these two construction schemes is compared in detail.
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The construction area of ​​this project is 15491m2, with 2 underground floors and 18 above-ground floors. The residential power distribution is on the underground floor, and the above-ground is for residential use. There are 3 high-voltage shafts. According to the requirements of the design drawings, the main power supply cable uses YJV-4 x 95+1 x 50. There are 162 household switch boxes in the whole building. Each shaft is controlled by 3 cables, and there are 9 cables for power supply. The following is a comparison of the cable laying of a meter box.