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Views: 0 Author: Site Editor Publish Time: 2026-08-18 Origin: Site
In scenarios such as data centers, computer room operation and maintenance, industrial automation control, and power distribution networks, non-stop online cabling upgrades for cabinets are essential and high-frequency operations. Unlike shutdown for renovation, live online construction does not require interruption of equipment operation or affect business continuity, effectively avoiding losses such as business interruption, data loss, and production stagnation caused by shutdown. However, at the same time, live-line work is extremely risky. It is very likely to cause safety accidents such as short circuits, arc sparks, false tripping of equipment, signal interference, and cable burning. Once there is an operational error, it can lead to equipment damage, business paralysis, and even casualties.
The root cause of many operation and maintenance accidents in computer rooms is not equipment failure, but rather non-standard construction processes, insufficient risk prediction, and casual handling of details. This article, in combination with national standards and practical experience from the front line, systematically sorts out the safety construction standard procedures, red line taboos, key points of risk prevention and control, and acceptance criteria for the live-line transformation of cabinets and the upgrade of online cabling, providing a practical basis that can be directly implemented for the live-line transformation of computer rooms.
The core logic of the cabinet live wiring renovation is: ensure operation first, then carry out the renovation, take risks in advance, be fully controllable throughout the process, carry out construction step by step, and conduct closed-loop acceptance. All operations must be carried out without affecting the live operation of existing equipment and without disturbing the in-use circuits.
l Minimum disturbance principle: Prioritize the addition of new wiring and bypass transition construction. It is strictly prohibited to arbitrarily modify, short-circuit or disconnect in-use live circuits to minimize contact with the existing system to the greatest extent.
l Risk classification and control principles: Distinguish between power strong current circuits, control secondary circuits, and signal weak current circuits, and formulate differentiated construction plans. It is strictly prohibited to mix strong and weak current operations or operate blindly on high-risk circuits.
l Dual-post supervision principle: All live wiring operations must follow the "operation + supervision" dual-post system. A single person is strictly prohibited from conducting any live construction operations.
l Principle of protection before construction: Wiring operations can only be initiated after insulation protection, equipment isolation, fireproof sealing, and warning signs are all in place.
All construction operations strictly follow national industry standards to ensure compliance with construction regulations and worry-free acceptance
l GB 50174-2017 "Code for Design of Data Centers" : Clearly stipulates the requirements for wiring zoning and layering in computer rooms, separation of strong and weak current, and neat cable laying
l GB 50348-2018 "Technical Standard for Security Prevention Engineering" : Standardizing line identification, joint treatment, and exposure protection standards
l GB 50217 "Standard for Design of Power Engineering Cables" : Constrains the requirements for cable selection, laying and insulation protection construction
The safety of non-stop power supply renovation is 90% dependent on the preparatory work in advance. Live-line work is strictly prohibited from being carried out on the spur of the moment or on a whim. The five major preparations, namely the plan, personnel, tools, site and equipment, must be completed.
l Conduct on-site investigation of the current status of the cabinets, sort out the in-use circuits, backup circuits, and strong and weak current zones, and mark key points such as high-risk live terminals, busbars, and PT/CT secondary circuits
l Prepare a special non-stop power supply construction plan, clearly defining the construction scope, step-by-step procedures, risk points, and emergency response measures. It is strictly prohibited to carry out construction beyond the scope
l Complete the technical and safety briefing for all staff, and ensure that construction personnel and supervisors clearly understand the operation red line and emergency evacuation procedures
l Take photos in advance to keep the original wiring layout and terminal sequence, and draw a simple wiring diagram to avoid messy wiring and incorrect connections
l Construction personnel must hold valid electrician operation certificates, be familiar with the norms for live operation of cabinets, and possess the ability to handle emergencies in case of faults
l The supervisor must have experience in the operation and maintenance of the computer room, be fully focused on the operation site throughout the process, not leave the post, not concurrently hold the operation position, and monitor in real time any abnormal conditions such as electric arcs, abnormal noises, and overheating
All tools must be compatible with the standards for live-line work, and ordinary tools are strictly prohibited from being used.
l Specialized insulated tools: insulated screwdrivers, insulated wire strippers, insulated wire crimping pliers. The withstand voltage grade of the tools shall not be lower than the highest working voltage on site
l Testing tools: Qualified voltage tester, insulation resistance tester, multimeter. Verify the validity of the tools in advance before operation
l Protective equipment: Insulating shoes, insulating gloves, anti-static work clothes, goggles. It is strictly prohibited to wear synthetic fiber clothing or metal jewelry while working
l Wiring materials: Compliant flame-retardant cables, wire number tubes, insulating heat shrink tubes, flame-retardant cable ties, terminal covers. Insulation damage and non-standard cables are strictly prohibited
l Hard barriers and warning signs should be set up in the operation area, and warning signs reading "Live Work, No closing of switches, No approaching" should be hung. Unrelated personnel are strictly prohibited from entering the operation area
l Clear away debris and flammable and explosive items around the cabinet, check the integrity of the fireproof sealing of the cabinet, and prepare fire extinguishing equipment in advance
l Temporary insulation and shielding should be provided for exposed live terminals, busbars and unused open openings of in-use equipment to prevent accidental short circuits during construction
l Release the device's capacitance for energy storage, eliminate the risk of residual voltage, and prevent electric shock during voltage detection and wiring
The entire process should follow the step-by-step construction logic of starting with the new and then moving to the old, starting with weak current and then strong current, starting with the remote end and then the near end, and starting with no-load and then loaded. It is strictly prohibited to make large-scale changes to the in-use lines at one time.
l Strictly distinguish the power main circuit, control secondary circuit and signal communication circuit. Implement separate trunking for strong and weak current, with power cables at the bottom and communication cables at the top. Install fireproof partitions in the middle for isolation to prevent signal interference
l Special verification of key high-risk circuits: The secondary circuit of the CT must not be open-circuited. Short-circuit protection should be done in advance before operation. The secondary circuit of the PT must not be short-circuited. Before wiring, disconnect the corresponding circuit breaker and conduct a voltage test to confirm there is no voltage before commencing construction
l Verify the voltage level, phase sequence and polarity of the cabinet, test the insulation performance of the circuit, and eliminate the risk of phase-to-phase and ground-to-ground short circuits
l The new cables are laid in advance throughout the process, running parallel to the original cables. They are naturally and straight laid in the cable trays and cable troughs without squeezing, twisting or cross-entangling. The filling rate of the cable troughs does not exceed 70%, and space for heat dissipation and maintenance is reserved
l Standard wire number tubes are pre-installed at both ends of the cable, with the circuit number, purpose, and starting and ending points marked clearly and permanently. There should be no joints and no insulation damage
l The ground wire should uniformly use a yellow-green dual-color dedicated wire. The grounding cross-section of the main line should comply with regulations, and it is strictly prohibited to reduce the size of the ground wire, mix the neutral wire and ground wire, or connect components in series with the PE wire
l After the cable laying is completed, an insulation test should be conducted first to confirm that there is no damage, no leakage, and no short circuit to ground
This stage is the highest risk point for live-line work and must strictly follow the refined operation norms:
l Follow the sequence of connecting the load side first and then the power supply side. When removing the wires, operate in the reverse direction to minimize the generation of arcs to the greatest extent
l Each cable should be installed and verified one by one. It is strictly prohibited to remove the insulation of multiple cables simultaneously or connect them at the same time. Exposed conductors must not touch each other or the casing
l The terminal wires should be tightly pressed without any loose or loose connections. After the pressing is completed, an insulating shield should be installed to completely cover all exposed conductors
l Give priority to using plug-in terminals and heat shrinkable insulated joints to enhance wiring safety and reduce the duration of live and exposed operations
l During the entire construction process, supervision should be carried out. Once any abnormal sounds, sparks, overheating, or odors occur, work should be immediately halted, personnel evacuated, and potential hazards identified and addressed
l After all the new lines are fully connected, tested normally and the business operation is stable, the abandoned old cables can be gradually removed. It is strictly prohibited to remove the old cables first and then connect the new ones
l Waste terminals and wire ends should be removed and cleared in a timely manner. Empty terminals should be insulated and sealed to prevent any exposed points from being left behind
l The entire line is neatly bound, with uniform spacing and moderate tightness of the cable ties. The internal wiring of the cabinet is horizontal and vertical, and the strong and weak current zones are clearly separated without any random intersections
l The fireproof sealing of the cable entrances and exits at the bottom of the cabinet has been re-improved to prevent air leakage, smoke leakage and dust accumulation through holes
l Check the phase sequence, polarity and on-off status of each loop one by one, test the insulation resistance and grounding performance, and ensure that the parameters are compliant
l Check the operating status of the equipment, monitor the current and temperature of the circuit, and confirm that there are no abnormalities such as overheating, overload, interference, or false operation
l Verify the stability of signal transmission, with normal communication, control and monitoring functions, and no packet loss, false alarms or malfunctions
To avoid major safety accidents, all live-line renovation operations must strictly adhere to the following red lines. Any violation will result in immediate suspension of work for rectification:
l It is strictly prohibited to carry out live wiring work without a plan, without briefing and without supervision
l It is strictly prohibited to operate with an open circuit in the secondary circuit of CT or a short circuit in the live connection of the secondary circuit of PT
l It is strictly prohibited to mix strong and weak electricity in the same trough, to lay cables of different voltage levels together, and to use the same pipe and hole for network cables and power cables
l It is strictly prohibited to work on exposed conductors while they are live, to strip insulation from multiple wires in parallel, or to have loose or missed connections at the terminals
l It is strictly prohibited to mix neutral and ground wires, series PE wires, use copper wires to replace fuses, or change the setting current of air switches without authorization
l It is strictly prohibited to plug or unplug terminals under load or blindly modify the core circuits in use
l It is strictly prohibited to place tools or metal debris inside the cabinet to eliminate the risk of short circuits caused by human factors
The completion of construction does not mean the end of the work. Standardized acceptance and archiving are the guarantees for long-term safe operation.
l Appearance inspection: Neat wiring, complete markings, intact insulation, no exposed points, and complete fireproof sealing
l Electrical acceptance: Insulation meets standards, grounding is reliable, there is no short circuit or leakage, and terminals are not overheating or loose
l Function acceptance: The equipment operates stably, business is not interrupted, signals are not interfered with, and protection logic is normal
l Keep before-and-after construction comparison photos, wiring drawings, test data and construction records
l Update the cabinet cable ledger and circuit identification list to ensure consistency among the drawings, site conditions and ledgers
l Record the renovation points, construction time, operators, and the handling of potential hazards to facilitate subsequent operation and maintenance traceability
80% of the faults in the cabinet's power-off renovation are caused by minor omissions: loose terminal connections leading to overheating, damaged insulation layer touching the shell, strong and weak current interference, misoperation of CT/PT circuits, discarded wire ends left behind, and misoperation due to displaced markings.
l In case of sparking, abnormal noise, smoke or heat: Immediately stop the operation, quickly evacuate the workers, cut off the power supply of the faulty circuit under the direction of the supervisor, identify potential hazards, and do not touch or handle them blindly
l In case of CT open circuit: Immediately short-circuit the secondary terminal, stop the operation, check the circuit problem, and resume operation after the rectification is completed
l In the event of a minor short circuit or abnormal signal: Immediately isolate the newly renovated circuit, restore the original in-use lines, ensure the priority operation of business, and then investigate and rectify the fault
The upgrade of the on-line wiring for the cabinet without power interruption is essentially a refined and low-disturbance electrical transformation in the operating system. The core is not "daring to carry out construction", but "being able to control risks, understand norms, and pay attention to details". Business continuity is the goal, zero safety incidents are the bottom line, and standardized processes are the guarantee.
All live-line operations must abandon empiricism and strictly follow the standardized process of "pre-planning, risk prediction, dual-post supervision, phased construction, and closed-loop acceptance", strictly adhering to the red line of electrical construction. This can not only ensure the uninterrupted and stable operation of the machine room and industrial equipment, but also completely avoid construction safety hazards, achieving a balance between safety and efficiency.
