What are the acceptance criteria for distribution boxes?

Release time： 2025-09-30

Production Qualifications: The manufacturer of distribution boxes and cabinets holds all necessary production certifications, including a production license, as well as technical and quality assessments approved by specialized national institutions, along with relevant accreditation documents.

The acceptance criteria for distribution boxes primarily include the following aspects:

I. Document Review

Production Qualification : The distribution box and cabinet manufacturers possess complete production qualifications, including a production license, as well as technical and quality assessment documents certified by specialized national institutions.
Certificate of Qualification and Certification : The distribution boxes and cabinets come with complete certificates of conformity and CCC certification, along with all necessary factory test and inspection reports.
Design Basis Production configurations are based on the design drawings approved by the design institute, which must comply with current design, construction, and acceptance standards.
Appearance and Branding :The distribution box has a clean and intact appearance, free from obvious defects such as scratches, dents, or deformations; the enclosure is undamaged and tightly sealed, with no signs of rust or damage; the door lock operates smoothly and reliably, and the labels are clearly visible.

II. Box and Component Inspection

Box material : Distribution box and cabinet panels are manufactured according to national industry standards, and the enclosure's protection rating meets design requirements (e.g., outdoor enclosures must be at least IP54).
Internal components :The internal electrical components are arranged according to national industry standards. The specifications and quantities of components such as circuit breakers, disconnect switches, current transformers, busbars, and others comply with the design requirements, and all product certificates and test reports are complete and valid.
Grounding and Bonding :The enclosure is equipped with a working ground bar and a protective ground bar, featuring sufficient terminal blocks for wiring. Jumper cables are made of 16mm² bare, flat, flexible copper wire, and the enclosure includes a pre-installed grounding bolt with durable, standardized grounding markings.

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