British Standard BS7870 Part 3 covers low voltage cables used for the provision of an electricity supply from a distribution main. These cables are manufactured in accordance with BS7870 Parts 3.11, 3.12, 3.20, and 3.22 for use by distribution and generation utilities. They are generally buried underground to connect individual houses or commercial properties to the grid by transmission, distribution, and power generation networks.

英國標準BS7870第3部分涵蓋用於從配電幹線提供電力的低壓電纜。這些電纜按照BS7870第3.11、3.12、3.20和3.22部分製造，供配電和發電公用事業使用。它們通常埋設於地下，通過輸電、配電和發電網絡將獨立房屋或商業物業連接至電網。

This Standard applies to concentric, split concentric, and waveform cables for fixed installations with both PVC and LSZH sheathing, featuring Copper and Aluminium conductors. Cable selection will be determined by the type of connection and the arrangement of neutral and protective conductors—TN-S or TN-C-S (PME) systems. Reference to BS7671 Section 312.2 should be made for further information.

本標準適用於固定安裝的同心、分裂同心和波形電纜，具有PVC和LSZH護套，採用銅和鋁導體。電纜選擇將由連接類型和中性線與保護導體的佈置決定——TN-S或TN-C-S（PME）系統。如需更多資訊，請參閱BS7671第312.2節。

BS7870 Part 3, Section 3.11 covers Cross-linked Polyethylene (XLPE) insulated combined neutral and earth copper wire concentric cables with a voltage rating of 0.6/1kV with PVC outer sheath.

BS7870第3部分第3.11節涵蓋交聯聚乙烯（XLPE）絕緣組合中性線和接地銅絲同心電纜，額定電壓為0.6/1kV，PVC外護套。

As with BS7870 Part 3.11, Section 3.12 covers XLPE insulated combined neutral and earth copper wire concentric cables with a voltage rating of 0.6/1kV. BS7870-3.12 cables feature Low Smoke Zero Halogen (LSZH) sheathing for enhanced fire safety.

與BS7870第3.11部分相同，第3.12節涵蓋XLPE絕緣組合中性線和接地銅絲同心電纜，額定電壓為0.6/1kV。BS7870-3.12電纜採用低煙無鹵（LSZH）護套以增強防火安全。

BS7870 Part 3, Section 3.20 covers PVC insulated split concentric cables with a voltage rating of 0.6/1kV. These cables feature separate neutral conductors with an extruded blue polymer layer for identification.

BS7870第3部分第3.20節涵蓋PVC絕緣分裂同心電纜，額定電壓為0.6/1kV。這些電纜具有帶擠出藍色聚合物層的獨立中性導體以便識別。

BS7870-3.22 is the Low Smoke Zero Halogen equivalent of Section 3.20, covering split concentric cables with a voltage rating of 0.6/1kV with enhanced fire safety properties.

BS7870-3.22是第3.20節的低煙無鹵等效版本，涵蓋額定電壓為0.6/1kV的分裂同心電纜，具有增強的防火安全性能。

BS7870-3.40 covers Low Voltage Waveform Cables with PVC sheathing, while BS7870-3.50 is the LSZH equivalent. Both have a voltage rating of 0.6/1kV and feature sectoral-shaped solid aluminium conductors with helical concentric copper wire screens.

BS7870-3.40涵蓋帶PVC護套的低壓波形電纜，而BS7870-3.50是其LSZH等效版本。兩者額定電壓均為0.6/1kV，採用扇形實心鋁導體和螺旋同心銅絲屏蔽。

BS7870 Part 3 cables are essential components for modern electrical distribution infrastructure. When selecting cables for your application, consider factors such as installation environment, fire safety requirements, conductor material preferences, and compliance with local regulations including BS7671.

BS7870第3部分電纜是現代電力配電基礎設施的重要組成部分。在為您的應用選擇電纜時，請考慮安裝環境、防火安全要求、導體材料偏好以及符合當地法規（包括BS7671）等因素。