Ten temporary safety management measures for sharing

Temporary electricity use is a crucial aspect of construction site safety management and one of the most common causes of accidents. Ensuring proper safety measures for temporary power is essential to minimize risks and promote a safer working environment on construction projects. Construction companies must not connect their own power supply systems to the public grid. This helps prevent unauthorized access and potential hazards that could affect the broader electrical network. In terms of technical safety measures for temporary electricity, any low-voltage three-phase four-wire system (220V/380V) that is directly grounded at the power source's neutral point must follow the "Safety Technical Specifications for Temporary Use of Construction Sites" (JGJ46). This ensures compliance with established standards and reduces the likelihood of electrical failures. All temporary electrical equipment and wiring should be used in accordance with the appropriate voltage levels and power capacity. Electrical components must meet national and industry standards, and the installation of temporary power systems must strictly adhere to electrical codes. Proper grounding is essential to ensure safety and prevent electric shocks. In explosion-proof areas, all power supplies, components, and wiring must meet the required explosion-proof ratings. Special safety measures, such as using flameproof enclosures and ensuring no sparks are generated, should be implemented to prevent hazardous situations. The grounding and protection systems for temporary electrical equipment must comply with relevant regulations. The protective earth wire (PE wire) must be an insulated conductor with a minimum cross-sectional area as specified. It is strictly prohibited to install switches or fuses on this wire. The working neutral wire (N wire) must pass through a residual current device (RCD), and there should be no direct electrical connection between the N wire and the PE wire after the RCD. The insulation of all temporary electrical lines and equipment must be intact and in good condition to avoid short circuits or electric shocks. All temporary power cables must be rubber-sheathed insulated cables to provide additional protection against damage. Overhead temporary power lines should be made of insulated copper conductors and installed on dedicated poles, avoiding trees and scaffolding. The lowest point of the overhead line should be at least 2.5 meters above the ground within the construction area and at least 5 meters above roads where vehicles pass. For underground cable installations, clear markers and warning signs should be placed along the route. Cables should be buried at a depth of no less than 0.7 meters, and protective casings should be added when crossing roads to prevent damage. Temporary power distribution panels and boxes should be clearly labeled, protected from rain, and placed at least 30 cm above the ground. Doors and covers should be securely closed to prevent accidental contact. When connecting or removing temporary power lines from a switch, the upstream switch must be turned off, and a safety warning sign should be displayed to alert others of the ongoing work. Lighting transformers used for temporary lighting must be double-winding safety isolating transformers. Fuses should be installed at 1-2 times the rated current. The voltage of portable lights should not exceed 36 volts, and in damp or metal environments like tanks, towers, and vessels, it should not exceed 12 volts. The selection and installation of residual current devices (RCDs) for temporary power lines must meet the requirements of GB6829 and GB13955. Each piece of equipment should have its own circuit breaker and RCD, ensuring the "one machine, one switch, one protection" principle is followed. Switch boxes and mobile tools should be equipped with RCDs that meet the required specifications. By following these guidelines, construction sites can significantly reduce the risk of electrical accidents and create a safer environment for workers.

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