三芯接地電纜完整技術對比 — 雙向照明電路專用
Comprehensive comparison of 3-core domestic wiring cables specifically designed for 2-way and intermediate lighting switching circuits. The third conductor enables control of a single light from multiple switch locations. The 6243B LSZH provides enhanced fire safety while the 6243Y offers cost-effective standard PVC insulation.
6243B 3 Core & Earth LSZH
vs
6243Y 3 Core & Earth
三芯接地電纜完整技術對比 — 雙向照明電路專用
Comprehensive comparison of 3-core domestic wiring cables specifically designed for 2-way and intermediate lighting switching circuits. The third conductor enables control of a single light from multiple switch locations. The 6243B LSZH provides enhanced fire safety while the 6243Y offers cost-effective standard PVC insulation.
專為雙向及中間照明開關電路設計的三芯家用佈線電纜完整對比。第三根導體可實現從多個開關位置控制單個燈具。6243B LSZH 提供增強防火安全，而 6243Y 提供經濟高效的標準 PVC 絕緣。
Why 3-Core Cable? 為什麼使用三芯電纜？
English: 3-core cables contain three insulated conductors plus a bare earth, making them essential for 2-way switching circuits where a light needs to be controlled from two or more locations (such as hallways, staircases, and large rooms). The three conductors carry the “strappers” and common terminal connections required for 2-way switch operation, while the earth provides circuit protection.
繁體中文：三芯電纜包含三根絕緣導體加一根裸露接地線，使其成為雙向開關電路的必需品，適用於需要從兩個或更多位置控制燈具的場合（如走廊、樓梯和大型房間）。三根導體承載雙向開關操作所需的”跨接線”和公共端子連接，而接地線提供電路保護。
6243B LSZH
Low Smoke Zero Halogen 低煙無鹵
6243Y Standard
Standard PVC Insulation 標準PVC絕緣
Product Overview 產品概述
The 6243B and 6243Y 3 Core & Earth cables are specialized domestic wiring cables designed primarily for 2-way and intermediate lighting switching circuits. Unlike standard twin and earth cables (6242B/6242Y) which contain only two current-carrying conductors, these 3-core cables provide the additional conductor necessary for implementing 2-way switching — a common requirement in hallways, staircases, landing areas, and large rooms where light control from multiple locations is desired.
The construction of both cable types features three individually insulated copper conductors (typically colored brown, black, and grey) plus a bare copper circuit protective conductor (earth), all enclosed within a flat-profile protective outer sheath. This configuration allows for the “strapper” connections between 2-way switches while maintaining proper earthing for the luminaire and switch accessories.
The fundamental difference between the two cable types lies in their insulation materials. The 6243B utilizes Low Smoke Zero Halogen (LSZH) thermosetting compounds compliant with BS 7211:2012, offering enhanced fire safety properties with minimal smoke and no toxic halogen gas emission when exposed to fire. The 6243Y employs standard PVC insulation per BS 6004:2012, providing a cost-effective solution for standard domestic installations. Notably, the 6243B also offers a 2.5mm² option for higher load applications, while the 6243Y is limited to 1.0mm² and 1.5mm² sizes.
6243B 和 6243Y 三芯接地電纜是專門設計的家用佈線電纜，主要用於雙向及中間照明開關電路。與僅包含兩根載流導體的標準雙芯接地電纜（6242B/6242Y）不同，這些三芯電纜提供實現雙向開關所需的額外導體——這在走廊、樓梯、平台區域及需要從多個位置控制燈光的大型房間中是常見需求。
兩種電纜類型的結構均採用三根獨立絕緣的銅導體（通常為棕色、黑色和灰色）加一根裸銅電路保護導體（接地），全部封裝在扁平型保護外護套內。這種配置允許在雙向開關之間進行”跨接線”連接，同時保持燈具和開關附件的正確接地。
兩種電纜類型之間的根本區別在於其絕緣材料。6243B 採用符合 BS 7211:2012 的低煙無鹵（LSZH）熱固性化合物，在暴露於火中時提供增強的防火安全特性，煙霧最少且無有毒鹵素氣體排放。6243Y 採用符合 BS 6004:2012 的標準 PVC 絕緣，為標準家用安裝提供經濟高效的解決方案。值得注意的是，6243B 還提供 2.5mm² 選項用於更高負載應用，而 6243Y 僅限於 1.0mm² 和 1.5mm² 規格。
💡 Understanding 2-Way Lighting Circuits 了解雙向照明電路
A 2-way lighting circuit allows a single light to be controlled independently from two different switch positions. This is achieved by using two 2-way switches connected by three conductors: two “strappers” (L1 and L2) that carry the switched live between the switches, and a “common” terminal connection. The 3-core cable provides these three conductors, with the earth providing circuit protection. This arrangement is essential for stairways, long hallways, and rooms with multiple entry points.
雙向照明電路允許從兩個不同的開關位置獨立控制單個燈具。這是通過使用由三根導體連接的兩個雙向開關來實現的：兩根”跨接線”（L1 和 L2）在開關之間承載切換的火線，以及一個”公共”端子連接。三芯電纜提供這三根導體，接地線提供電路保護。這種佈置對於樓梯、長走廊和有多個入口的房間是必不可少的。
開關 1
三芯電纜
開關 2
燈具
Key Performance Differences 主要性能差異
Fire Safety 防火安全
Maximum Temperature 最高溫度
Short Circuit Temp 短路溫度
Current @ 1.5mm² 載流量
Available Sizes 可用規格
Manufacturing Standard 製造標準
📊 Current Capacity Comparison 載流量對比
Technical Specifications 技術規格
BS 7211:2012 | BASEC Approved | Low Smoke Zero Halogen
| Product Code 產品代碼 | Core Size 芯線 (mm²) | Conductor 導體類型 | Max Diameter 最大直徑 (mm) | Current 載流量 (A) | Resistance 20°C 電阻 (Ω/km) | Colors 顏色 | Lengths 長度 (m) | Usage 用途 |
|---|---|---|---|---|---|---|---|---|
| 6243B1.0 | 1.0 | Solid | 5.0 × 12.1 | 19 | 18.1 / 18.1 | 50, 100 | 2-way lighting | |
| 6243B1.5 | 1.5 | Solid | 5.3 × 12.9 | 24 | 12.1 / 18.1 | 50, 100 | Higher load 2-way | |
| 6243B2.5 | 2.5 | Solid | 6.0 × 14.6 | 33 | 7.41 / 12.1 | 100 | Higher load circuits |
BS 6004:2012 | BASEC Approved | Standard PVC Insulation
| Product Code 產品代碼 | Core Size 芯線 (mm²) | Conductor 導體類型 | Max Diameter 最大直徑 (mm) | Current 載流量 (A) | Resistance 20°C 電阻 (Ω/km) | Colors 顏色 | Lengths 長度 (m) | Usage 用途 |
|---|---|---|---|---|---|---|---|---|
| 6243Y1.0 | 1.0 | Solid | 4.8 × 11.4 | 16 | 18.1 / 18.1 | 10, 50, 100 | 2-way lighting | |
| 6243Y1.5 | 1.5 | Solid | 5.3 × 12.9 | 20 | 12.1 / 18.1 | 5, 10, 50, 100 | Higher load 2-way |
💡 Selection Guide 選擇指南
🔥 Choose 6243B LSZH When 選擇 6243B LSZH 當：
- Fire safety is critical for the installation 防火安全對安裝至關重要
- Public buildings: hospitals, schools, hotels 公共建築：醫院、學校、酒店
- Escape route and stairwell lighting 逃生路線及樓梯間照明
- High-rise residential buildings 高層住宅建築
- 2.5mm² cable required for higher loads 需要 2.5mm² 電纜用於更高負載
- Higher current capacity needed 需要更高載流能力
- Building regulations mandate LSZH 建築法規要求低煙無鹵
- Sensitive electronic equipment nearby 附近有敏感電子設備
🔌 Choose 6243Y PVC When 選擇 6243Y PVC 當：
- Cost-effectiveness is the priority 成本效益優先
- Standard domestic residential use 標準家用住宅使用
- Private home 2-way lighting circuits 私人住宅雙向照明電路
- Low fire risk environments 低火災風險環境
- 1.0mm² or 1.5mm² sufficient for application 1.0mm² 或 1.5mm² 足夠應用
- Smaller length options needed (5m, 10m) 需要較短長度選項
- DIY and home improvement projects DIY 及家居裝修項目
- Budget-conscious installations 預算有限的安裝
Common Features 共同特性
3 Core + Earth Construction 三芯接地結構
Three insulated conductors (brown, black, grey) plus bare copper earth for 2-way switching circuits.
三根絕緣導體（棕、黑、灰）加裸銅接地，用於雙向開關電路。
2-Way Switching Ready 雙向開關就緒
Specifically designed for 2-way and intermediate lighting circuits with strapper connections.
專為雙向及中間照明電路設計，配有跨接線連接。
BASEC Approved BASEC認證
Third-party certified ensuring consistent quality, safety and UK standards compliance.
經第三方認證，確保一致的品質、安全性和符合英國標準。
Solid Copper Conductors 實心銅導體
High-quality solid copper conductors for excellent conductivity and reliable terminations.
優質實心銅導體，具出色導電性及可靠端接。
Damp Location Rated 潮濕環境額定
Suitable for fixed installation in both dry and damp premises.
適用於乾燥及潮濕環境的固定安裝。
Versatile Installation 多用途安裝
Surface clipping, cable trays, free air, conduit or trunking installation options.
可表面夾固、電纜托架、架空、導管或電纜槽安裝。
Applications 應用領域
3-core cables are essential for any installation requiring 2-way or intermediate switching, where a single light or group of lights needs to be controlled from multiple switch positions. They are commonly found in residential stairways, hallways, and large rooms, as well as commercial and public building corridors.
三芯電纜對於任何需要雙向或中間開關的安裝都是必不可少的，其中單個燈具或一組燈具需要從多個開關位置進行控制。它們常見於住宅樓梯、走廊和大型房間，以及商業和公共建築走廊。
Installation Methods 安裝方式
Surface Clipping 表面夾固
Clipped to surface
夾固於表面
Cable Trays 電纜托架
On tray systems
托架系統安裝
Free Air 架空
Free air installation
架空安裝
Conduit 導管
In conduit systems
導管系統安裝
Trunking 電纜槽
In trunking systems
電纜槽系統安裝
Protection 機械保護
Use conduit where damage possible
可能損壞處使用導管
Standards & Compliance 標準與合規
Standard for 6243B: Cables with thermosetting insulation having low emission of smoke and corrosive gases | 6243B適用標準：熱固性絕緣電纜，低煙低腐蝕氣體排放
BSI Shop Reference →Standard for 6243Y: Electric cables PVC insulated, non-armoured for voltages up to 450/750V | 6243Y適用標準：PVC絕緣非鎧裝電纜
BSI Shop Reference →Requirements for Electrical Installations including 2-way lighting circuit design | 電氣安裝要求，包括雙向照明電路設計
IET Wiring Regulations →Third-party certification ensuring cable quality, safety and performance | 第三方認證確保電纜品質、安全及性能
BASEC Official Website →International standard for quality management | 國際品質管理標準
ISO Official Reference →Single vertical insulated wire or cable flame test | 單根垂直絕緣電線燃燒試驗
IEC Webstore Reference →Measurement of smoke density of cables (applicable to 6243B) | 電纜煙密度測量（適用於6243B）
IEC Webstore Reference →Test on gases evolved during combustion (applicable to 6243B) | 燃燒時釋放氣體測試（適用於6243B）
IEC Webstore Reference →Authoritative References 權威參考資料
- British Standards Institution. (2012). BS 7211:2012 Thermosetting insulated cables for voltages of 300/500 V and 450/750 V. London: BSI. https://shop.bsigroup.com/
- British Standards Institution. (2012). BS 6004:2012 Electric cables — PVC insulated, non-armoured cables. London: BSI. https://shop.bsigroup.com/
- Institution of Engineering and Technology. (2022). BS 7671:2018+A2:2022 Requirements for Electrical Installations. London: IET. https://electrical.theiet.org/
- British Approvals Service for Cables. (2024). BASEC Certification Scheme. Milton Keynes: BASEC. https://www.basec.org.uk/
- International Electrotechnical Commission. (2009). IEC 60332-1-2 Fire tests on cables. Geneva: IEC. https://webstore.iec.ch/
- International Electrotechnical Commission. (2013). IEC 61034-2 Smoke density measurement. Geneva: IEC. https://webstore.iec.ch/
- International Electrotechnical Commission. (2014). IEC 60754-1 Halogen acid gas test. Geneva: IEC. https://webstore.iec.ch/
- International Organization for Standardization. (2015). ISO 9001:2015 Quality management systems. Geneva: ISO. https://www.iso.org/
Contact Us 聯繫我們
For technical consultation, quotations, or customized 3-core cable solutions, please contact our professional team.
如需技術諮詢、報價或定製三芯電纜解決方案，請聯繫我們的專業團隊。
