Precautions for Live Maintenance of Low-Voltage Distribution Equipment-Jiangxi Yawei Electrical

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Precautions for Live Maintenance of Low-Voltage Distribution Equipment

Release date:

2018-11-08

To avoid disrupting normal power supply, it is sometimes necessary to perform live low-voltage maintenance on low-voltage equipment such as distribution cabinets. When conducting routine live low-voltage maintenance, the following precautions should be observed: 1. A dedicated person must provide supervision. The purpose of this is that, in case of an unexpected accident during the repair process, the supervisor can immediately cut off the power supply (by switching off the circuit breaker or isolating switch in the distribution cabinet, or by removing the fuse cartridge). Additionally, if the technician might accidentally touch or come too close to energized conductors, or in case of operator error, the supervisor can promptly issue a warning to prevent electric shock or other potential hazards. 2. Insulated-handled tools must be used, and workers should stand on dry insulating materials, such as wooden ladders, platforms, or stools.

To avoid disrupting the normal power supply, it is sometimes necessary to perform live low-voltage maintenance on low-voltage equipment such as low-voltage distribution cabinets. When conducting routine live low-voltage maintenance, the following precautions should be observed.

1. A dedicated supervisor should be present. The purpose is that, in the event of an accident during maintenance work, the supervisor can immediately cut off the power supply (by opening the circuit breaker or isolating switch in the distribution cabinet, or by removing the fuse plug). Additionally, if the maintenance worker might come into contact with or get too close to live conductors, or if there’s a risk of misoperation, the supervisor can promptly issue a warning to prevent electric shock and other potential accidents.

2. Use tools with insulated handles, and while working, stand on dry insulating materials (such as wooden ladders, platforms, or stools), wearing gloves made of dry cloth and insulated footwear like rubber or plastic-soled shoes. If working on electrical circuits, also ensure you wear a safety helmet. Always wear long-sleeved clothing during tasks. It is strictly prohibited to use files, steel measuring tapes, brushes with metal components, slotted screwdrivers, or standard wire cutters—these tools pose significant electrical hazards.

3. When performing maintenance on low-voltage lines or transformer platforms installed on the same pole as high- and low-voltage lines, first check the distance from live high-voltage components and take measures to prevent accidental contact with them. Personnel must not cross under low-voltage energized conductors unless insulation measures have been properly implemented. Additionally, when working on energized low-voltage distribution cabinets or other distribution equipment, ensure isolation measures are in place to prevent phase-to-phase short circuits and single-phase ground faults.

4. Before climbing onto utility poles, transformer platforms, or equipment, first identify the phase wire, neutral wire, and ground wire, and carefully select your working position. When disconnecting wires, always remove the phase wire first, followed by the neutral or ground wire; reverse this sequence when reconnecting. During the task, never allow your body to come into contact with both wire ends simultaneously.

5. When performing maintenance on energized electricity meters and relay circuits within the distribution cabinet, the secondary windings of voltage and current transformers must be reliably grounded. When disconnecting the current circuit, the dedicated terminals on the secondary side of the current transformer should be short-circuited.

6. Standing ladders and stools must be placed securely, with someone holding them from below to prevent maintenance personnel from slipping and falling.

7. When inspecting and servicing terminal blocks where the live and neutral wires (two separate phase wires) are located very close to each other—such as at power switches, wiring terminals in distribution cabinets, relays, transfer switches, and similar components—proceed with extreme caution (it’s generally recommended to perform maintenance while the power is off). Never look directly near these areas, as doing so could easily lead to a short circuit and potentially cause severe eye injuries.

8. When performing live maintenance, ensure the ground is protected against moisture and water; outdoor live maintenance should be avoided on cloudy or rainy days. Live maintenance operations should be halted entirely during thunderstorms.

After completing the live-line maintenance, a thorough recheck should be performed. The inspection items should be identical to those conducted during the power-off maintenance.

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