This abstract focuses on the ZR-YJV2 series of copper core cables, which adhere to national standards and are designed for three-phase four-wire systems, with configurations available in 2, 3, 4, and 5 cores, and conductor cross-sectional areas of 1.5mm², 2.5mm², 4mm², 6mm², and 10mm². These cables are engineered to meet rigorous safety, performance, and reliability requirements, making them suitable for a wide range of industrial, commercial, and residential applications where efficient power transmission and fire resistance are critical. The ZR-YJV2 designation denotes key characteristics of the cable. "ZR" stands for "flame-retardant," indicating that the cable is constructed with materials that resist combustion and slow the spread of fire, enhancing safety in environments where fire hazards may exist, such as buildings, factories, and infrastructure projects. "YJV" refers to the cable's insulation and sheath materials: "Y" denotes a cross-linked polyethylene (XLPE) insulation, which offers excellent thermal resistance, chemical stability, and electrical insulation properties, allowing the cable to operate at higher temperatures (typically up to 90°C) compared to traditional PVC-insulated cables. "J" indicates a copper conductor, known for its high electrical conductivity, ensuring minimal power loss during transmission. "V" signifies a polyvinyl chloride (PVC) sheath, which provides mechanical protection against abrasion, moisture, and environmental factors, ensuring durability and longevity in various installation conditions. The cables are available in multiple core configurations to accommodate different electrical systems. The 2-core and 3-core versions are commonly used in single-phase and three-phase power supply systems, respectively, while the 4-core and 5-core variants are specifically designed for three-phase four-wire systems. In three-phase four-wire applications, the additional neutral core (and sometimes a protective earth core in 5-core cables) facilitates balanced current distribution, protects against overvoltage, and ensures safe operation of electrical equipment. This versatility makes the ZR-YJV2 series adaptable to diverse scenarios, from powering industrial machinery and commercial buildings to residential electrical networks. Conductor cross-sectional areas range from 1.5mm² to 10mm², each suited to specific current-carrying capacities. Smaller sizes (1.5mm², 2.5mm²) are typically used for lighting circuits, small appliances, and low-power devices, while larger sizes (4mm², 6mm², 10mm²) are employed for higher-power equipment, distribution boards, and main supply lines. The copper core ensures efficient conductivity, reducing energy loss and maintaining stable voltage levels, which is essential for the reliable operation of sensitive electrical devices. Compliance with national standards is a cornerstone of the ZR-YJV2 series. These standards govern manufacturing processes, material quality, electrical performance (such as insulation resistance and dielectric strength), mechanical properties (including tensile strength and flexibility), and flame-retardant characteristics. Rigorous testing ensures that the cables meet or exceed these standards, guaranteeing consistent performance and safety across different batches and applications. Installation of ZR-YJV2 cables is flexible, as they can be laid in trenches, conduits, or directly buried, depending on the environment. The PVC sheath provides resistance to moisture and corrosion, making them suitable for both indoor and outdoor use, including damp or moderately harsh conditions. However, proper installation practices, such as avoiding excessive bending or exposure to extreme temperatures beyond the cable's rated limits, are recommended to maintain optimal performance. In summary, the ZR-YJV2 copper core cables represent a reliable and safe solution for three-phase four-wire power transmission. Their flame-retardant design, high-quality insulation and sheath materials, multiple core configurations, and adherence to national standards make them a preferred choice for engineers, electricians, and project managers seeking efficient, durable, and compliant electrical cabling. Whether in industrial facilities, commercial complexes, or residential buildings, these cables contribute to the stability and safety of electrical systems, ensuring uninterrupted power supply and minimizing risks associated with fire and electrical faults.