Guide for SGCC One Paper Certificate Application in Cold Shrink Cable Accessory Industry

Introduction

Liquid Silicone Rubber (LSR) cold shrink cable accessories are critical components in China’s State Grid Corporation of China (SGCC) power transmission and distribution networks, valued for their superior elasticity, UV resistance, and 30+ year service life in harsh operating environments. The SGCC “One Paper Certificate” (officially named the *Supplier Qualification Verification Certificate for Power Material Products*) is a mandatory prerequisite for LSR cold shrink cable accessory manufacturers to participate in SGCC centralized procurement tenders. Unlike voluntary product certifications, this document verifies that a manufacturer’s production capacity, quality management system, product performance, and after-sales service capabilities fully align with SGCC’s strict technical and operational specifications for grid infrastructure.

For first-time applicants in the LSR cold shrink cable accessory segment, the application process is often hindered by ambiguous eligibility criteria, unstandardized sample testing protocols, and lengthy review cycles. This guide breaks down the full application framework, including pre-application preparation requirements, step-by-step submission workflows, standard processing timelines, and common failure points, to help manufacturers streamline their certification efforts and reduce avoidable delays.

Pre-Application Eligibility and Document Preparation

Only manufacturers that meet SGCC’s baseline qualification thresholds are eligible to submit an application, as the verification process prioritizes entities with independent R&D, mass production, and full quality control capabilities rather than traders or third-party assemblers.

Fundamental Qualification Thresholds for LSR Cold Shrink Cable Accessory Manufacturers

All applicants must first satisfy the following non-negotiable criteria, as outlined in SGCC’s 2024 *Power Material Supplier Qualification Verification Specification for Cable Accessories*:

Failure to meet any of the above thresholds will result in automatic rejection at the initial document review stage, with no opportunity for resubmission for a minimum of 6 months.

Mandatory Document Checklist

Applicants must compile and upload a standardized set of documents to the SGCC E-Commerce Platform (ECP) in uneditable PDF format, with all scanned copies bearing the official seal of the manufacturer. The core document set includes:

1. Basic enterprise documents: Business license, tax registration certificate, organization code certificate (or unified social credit code certificate), and capital verification report issued by a qualified third-party accounting firm
2. Management system certifications: Full copies of valid ISO 9001, ISO 14001, and OHSAS 18001 certificates, with supplementary proof of annual surveillance audits passed in the past 3 years
3. Product technical documents:

• LSR material formulation specifications, including raw material supplier information, Shore hardness, elongation at break, and dielectric strength test reports for the silicone rubber base material
• Product structural drawings for all applied product models (10kV, 35kV, 110kV, etc.), including dimensional tolerances, insulation layer thickness, and stress cone design parameters
• Type test reports issued by a SGCC-recognized third-party testing institution (e.g., China Electric Power Research Institute, Wuhan High Voltage Research Institute) within the past 5 years, covering all mandatory test items listed in GB/T 12706.4 and DL/T 1075 standards

1. Production and testing capacity proof:

• Equipment list of LSR injection molding machines, vacuum vulcanization ovens, high voltage test benches, partial discharge testers, and material performance testing equipment, including purchase invoices, calibration certificates, and daily operation records
• Production process flow charts, with clear identification of key control points for LSR material mixing, injection molding, and post-vulcanization

1. Operational performance proof:

• Sales contracts and operation certificates for at least 100 sets of applied LSR cold shrink cable accessories that have been in stable operation in provincial or higher-level power grids for more than 2 years, with no quality-related operation failures recorded
• After-sales service network layout, including resident service team contact information for all provincial grid regions where the manufacturer supplies products

All documents must be submitted in Chinese, with translated copies required for any foreign-issued certifications (e.g., imported LSR raw material test reports) and notarized by a Chinese notary public.

Step-by-Step Application Workflow

The SGCC One Paper Certificate application process is fully digitalized via the SGCC ECP, with no offline submission channels available for regular applications. The workflow is divided into four sequential stages, with no backtracking permitted once a stage is submitted for review.

Stage 1: Online Account Registration and Initial Information Submission

First-time applicants must first register a supplier account on the SGCC ECP (https://ecp.sgcc.com.cn) and complete enterprise real-name authentication:

1. Fill in basic enterprise information, including unified social credit code, registered address, legal representative details, and contact information for the designated application liaison
2. Upload scanned copies of the business license, legal representative ID card, and power of attorney for the application liaison, then submit for platform authentication. This process typically takes 3-5 working days, with rejected applications requiring resubmission of corrected information
3. Once authenticated, select the “Cold Shrink Cable Accessories” product category under the “Qualification Verification” module, and specify the voltage levels applied for (10kV, 35kV, 110kV, etc.). Note that each voltage level requires separate document preparation and review, and applicants may apply for multiple levels simultaneously if they meet the corresponding criteria
4. Upload all pre-compiled mandatory documents in the specified format, ensuring that file names follow the naming convention: *[Product Model]_[Document Type]_[Issue Date].pdf* to avoid automatic system rejection

Before final submission, applicants are recommended to use the platform’s built-in document verification tool to check for missing pages, unclear scans, and expired certificates, as 32% of initial applications are rejected in 2023 due to basic formatting errors, per SGCC’s annual supplier qualification report.

Stage 2: Document Review and Sampling Notice

After online submission, SGCC’s Material Department assigns dedicated reviewers to conduct a two-level document review:

1. Preliminary review: A third-party service agency contracted by SGCC conducts a formal check of document completeness, validity, and compliance with threshold requirements. This stage takes 10-15 working days, and applicants will receive a notification of missing or non-compliant documents via the platform, with a 5-working-day window to submit supplementary materials. Only one round of supplementation is permitted; applications with still non-compliant documents after supplementation are rejected
2. Expert review: A panel of 5-7 industry experts (including grid operation engineers, LSR material specialists, and cable accessory testing experts) conducts a technical review of product performance parameters, production process rationality, and operational performance records. This stage takes 15-20 working days, and experts may request additional technical clarification via video conference with the applicant’s R&D team
3. Sampling notification: Applicants that pass the expert review will receive an official sampling notice within 3 working days, which specifies the product models, quantity, and designated testing institution. For LSR cold shrink cable accessories, the standard sampling quantity is 3 sets per voltage level, with an additional 2 sets of raw LSR material samples (5kg each) for material performance verification

Applicants must ensure that sampled products are randomly selected from finished product warehouses that have passed in-house quality inspection, and must not produce special samples for testing. SGCC reserves the right to conduct unannounced spot sampling at the applicant’s production site to replace the applicant’s submitted samples if tampering is suspected.

Stage 3: Product Testing and On-Site Audit

This stage is the most rigorous part of the application, with a 40% failure rate for LSR cold shrink cable accessory applicants in 2023, per SGCC data.

Product Testing

Sampled products and raw material samples must be delivered to the designated testing institution within 10 working days of receiving the sampling notice, with freight borne by the applicant. The testing scope covers mandatory items specified in SGCC’s *Technical Specification for Cold Shrink Cable Accessories*, with key test items and pass criteria listed below:

Testing typically takes 30-45 working days, depending on the product voltage level. Applicants will receive a full test report within 5 working days of testing completion; failed items cannot be retested, and the application will be rejected.

On-Site Audit

While product testing is underway, SGCC will arrange an audit team of 2-3 experts to conduct a 1-2 day on-site audit at the applicant’s production facility, focusing on the following areas:

1. Consistency verification: Confirming that production equipment, process flows, and raw material suppliers match the information submitted in the application documents
2. Quality control system operation: Reviewing incoming raw material inspection records, LSR mixing batch records, injection molding process parameter records, finished product testing records, and non-conforming product handling records for the past 6 months
3. Personnel qualification verification: Checking the professional qualification certificates of R&D engineers, injection molding operators, and high voltage testing personnel, and conducting on-site assessment of operational proficiency
4. After-sales service capability verification: Confirming the existence of a dedicated after-sales service team and spare parts warehouse, with response time commitments of ≤24 hours for provincial grid service requests and ≤48 hours for remote regional requests

The audit team will issue an on-site audit report with a pass/fail conclusion within 3 working days of the audit. Minor non-conformities (e.g., missing equipment calibration labels) require rectification within 10 working days and submission of proof for recheck, while major non-conformities (e.g., falsified production records, use of non-specified LSR raw materials) result in immediate application rejection and a 2-year ban on reapplication.

Stage 4: Final Approval and Certificate Issuance

After passing both product testing and on-site audit, the applicant’s information is submitted to SGCC’s Material Department for final approval:

1. Public notification: The list of qualified suppliers is published on the SGCC ECP for a 7-day public comment period. Any objections from third parties (e.g., reports of quality violations) will be investigated, and the application will be suspended until the investigation is completed
2. Certificate generation: Applicants that pass the public notification period will receive an electronic version of the One Paper Certificate via the platform within 3 working days, and a physical printed copy will be mailed to the applicant’s registered address within 10 working days
3. Certificate validity: The certificate is valid for 3 years from the date of issuance, covering all product models and voltage levels specified in the application. Manufacturers must apply for renewal 6 months before the certificate expires, following the same process as first-time applications but with a simplified document review for existing product lines

Standard Application Timeline and Factors Affecting Processing Duration

The total processing time for a standard SGCC One Paper Certificate application for LSR cold shrink cable accessories is 110-170 working days under ideal circumstances, with no supplementary requests or reworks.

Standard Timeline Breakdown

The following timeline assumes all submitted materials are fully compliant and no rectifications are required:

For manufacturers applying for multiple voltage levels simultaneously, the timeline is extended by 15-20 working days per additional voltage level due to increased testing and review workload.

Common Factors Causing Delays

In practice, 68% of applications take longer than the standard timeline, with the most common delay factors including:

1. Incomplete or non-compliant application documents: Missing type test reports, expired management system certifications, or inconsistent product parameter information can add 10-20 working days to the review stage, as applicants must recompile and resubmit materials
2. Testing backlogs at designated institutions: During peak application periods (typically Q1 and Q3 each year), SGCC’s recognized testing institutions may have a backlog of samples, extending testing time by 20-30 working days. Applicants are advised to submit applications in Q2 or Q4 to avoid backlogs
3. On-site audit non-conformities: Minor non-conformities requiring rectification add 10-15 working days to the process, as the audit team must review rectification evidence and may conduct a follow-up spot check
4. Objections during the public notification period: Valid objections from competitors or grid operators regarding product quality or operational failures can extend the approval process by 30-60 working days while SGCC conducts an independent investigation

To minimize delays, applicants are recommended to conduct a pre-audit of all documents and production facilities by a third-party consulting agency specializing in SGCC qualification verification, which can reduce the risk of non-conformities by 72% according to industry data.

Conclusion

Obtaining the SGCC One Paper Certificate is a critical milestone for LSR cold shrink cable accessory manufacturers seeking to enter the Chinese grid market, requiring systematic preparation across production capacity, quality control, product performance, and operational performance. By strictly adhering to the eligibility criteria, compiling complete and compliant application documents, and proactively addressing potential non-conformities during pre-application preparation, manufacturers can streamline the process and avoid costly delays.

It is important to note that the certificate is not a one-time qualification: SGCC conducts annual dynamic spot checks on certified suppliers, including random product sampling and unannounced on-site audits. Manufacturers that fail spot checks or have quality incidents recorded during grid operation will have their certificates suspended or revoked, and will be barred from SGCC procurement activities for a minimum of 1 year. For long-term market access, manufacturers should maintain consistent product quality, continuously optimize LSR material formulations and production processes, and align their operational systems with SGCC’s evolving technical specifications to ensure smooth renewal of the certificate upon expiration.