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Construction, Installation and Acceptance Standards for Power Systems of Industrial Factories
2026/1/27
01 Construction and Installation Technical Requirements
According to the "Standard for Electrical Installation and Acceptance of Industrial Buildings", the following preparatory work should be completed before construction:
Design review: Verify the consistency between the design drawings and the on-site conditions, with a particular focus on reviewing the cable routing, equipment layout, and coordination with the process pipelines.
Material inspection: For materials such as cables, switches, and lamps, factory certificates of conformity and inspection reports are required. Among them, cables need to be sampled for direct current withstand voltage tests.
Safety Preparation: Develop a special safety plan. Construction workers must hold special operation certificates for electricians to work. Safety protection facilities should be set up during high-altitude operations. Key control points during the construction process:
Cable laying: For 10kV and above high-voltage cables, the bending radius should be no less than 20 times the cable diameter; for low-voltage cables, it should be no less than 10 times the diameter. When laying cable trays horizontally, the spacing between supports should not exceed 1.5 meters; when laying them vertically, it should not exceed 2 meters.
Distribution equipment installation: The verticality deviation of the distribution cabinet should not exceed 1.5‰, and the flatness deviation of the panel surface should not exceed 5mm; When installing the transformer, the top of the foundation steel should be 100mm higher than the ground, and it should be reliably grounded.
Grounding device construction: The grounding body uses angle steel ∠50×5 (length 2.5m), with a spacing of 5m, and the burial depth should be no less than 0.6m; the welding length of the grounding wire is 6 times the diameter of the round steel and 2 times the width of the flat steel, and it should be double-sided welded.
02 Acceptance Criteria and Process
The acceptance of the power system in industrial plants should be divided into phased acceptance and final acceptance. The acceptance content covers three dimensions: document review, on-site inspection, and performance testing.
The document review requires the submission of the following files:
Design drawings, design changes and final drawings;
Equipment qualification certificate, manual and inspection report;
Construction records (such as concealed works records, cable laying records, etc.)
Insulation test reports, grounding resistance test reports, etc.
The on-site inspection focused on:
Equipment installation quality: Arrangement regularity of distribution cabinets, grounding connection of transformers, clarity of cable markings;
Cable laying: Cable fixation conditions, protective measures, and integrity of identification marks;
Safety facilities: Warning signs, guardrails, and fire-fighting equipment configuration.
The performance test should include:
Insulation resistance test: The insulation resistance of high-voltage equipment should be no less than 1000 MΩ, and that of low-voltage equipment should be no less than 0.5 MΩ.
Ground resistance test: Working ground ≤ 4Ω, Lightning protection ground ≤ 10Ω, Combined ground ≤ 1Ω;
Relay protection test: The operating values and time limits of overcurrent protection and instantaneous protection should comply with the design requirements;
Load test: Run at 80% of the rated load for 24 hours. The temperature rise and voltage drop of the equipment should be within the allowable range.
After the acceptance is deemed合格， an "Industrial Factory Electrical System Acceptance Report" should be issued, clearly stating the acceptance conclusion and any rectification requirements (if any).
For power systems in explosive hazardous environments, a special explosion-proof acceptance inspection must be conducted by institutions with corresponding qualifications.
