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Service Culture

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Frequently Asked Questions

Service Culture

Service

Pre-sales

Service

We will provide you with our most professional customer service representatives to answer any questions you may have, carefully analyze and compare cable performance for you, and ensure that you can make your selection with confidence.

Service

During sales

Service

Our products are manufactured strictly in accordance with national standards, and we offer a “Swift” dedicated delivery service. We will dispatch professional on-site application engineers to provide installation training and guidance, ensuring that installation personnel fully understand and correctly perform cable installation tasks.

Service

After-sales

Service

We strictly adhere to the national “Three Guarantees” service regulations, and our service network covers major cities across the country. We have established a 24-hour, round-the-clock service hotline to patiently address any inquiries or complaints from our customers.

Sales network

We have a presence of Yongyi Zhujiang Cables in every corner of the world, and our sales network spans across the globe.

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Frequently Asked Questions

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Requirements for conductor cross-sectional area in the standard

Currently, product specifications in major mainstream standards systems for wires and cables all use nominal cross-sectional areas or standard designations to distinguish conductors of different cross sections. Examples include IEC standards, European standards, and national standards (such as GB/T 5023 and GB/T 12706). Among these, the verification of different cross-section standard designations is based on conductor resistance values rather than on direct measurements of conductor cross-sectional areas. In the national standards GB/T 5023-2008, GB/T 5013-2008, and GB/T 12706-2008, it is primarily stipulated that cable conductors must meet the requirements of GB/T 3956. The main verification items include: (1) the maximum diameter of individual wires in flexible conductors and the minimum number of strands in rigid conductors; (2) the resistance of the conductor at 20°C.

The "practical" cross-sectional area of the cable conductor

Actual cross-sectional area: This refers to the actual cross-sectional area of the conductor—the value measured using a micrometer. For wire and cable manufacturers, the question is: Given a nominal cross-sectional area, what should the final designed cross-sectional area of the conductor be in order to meet the standard requirements? Specifically, under the nominal cross-sectional area, the designed cross-sectional area (electrical cross-sectional area) must satisfy the standard requirements—that is, whether the DC resistance meets the specified standards. Today, with improvements in conductor material production processes and advances in science and technology, advanced production techniques for oxygen-free copper have become widely adopted. As a result, the resistivity of copper conductor materials is now sufficiently low that copper wires with diameters smaller than the nominal diameter can easily meet the corresponding standard requirements for DC resistance.

Nominal cross-sectional area of the cable conductor

Nominal cross-sectional area refers to the value specified in the product specifications and is often used in tables. Values derived from the nominal value generally need to be verified through measurement within the prescribed tolerances.

What is the CQC arrangement?

The China Quality Certification Centre (CQC) is a national-level certification body established by the State Administration for Market Regulation and entrusted to the National Certification and Accreditation Administration for management, with the approval of the CQC’s Organizing Committee. CQC is China’s earliest, largest, and most prestigious certification body engaged in quality certification activities. Over the past several decades, it has accumulated extensive experience in global quality certification and achieved remarkable results in all its operations. It ranks first among China’s certification bodies in terms of the number of certified clients and is among the top globally.