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Example of a two-story house light cabinet

Example of a two-storey house electrical cabinet cable with a RCBO main power cabinet.# Light cabinet # Home

2025/12/25 Edited to

... Read moreหลายคนถามเรื่อง “การต่อ RCBO 2P” กับ “การต่อมิเตอร์ไฟฟ้าบ้าน” เลยขอเสริมจากรูปตัวอย่างให้ละเอียดขึ้นแบบที่ผมใช้เป็นแนวทางเวลาอธิบายหน้างานนะครับ (เน้นความเข้าใจและความปลอดภัย) 1) โครงสร้างภาพรวมที่ควรเป็น (ตามผังในรูป) - ไฟจาก “มิเตอร์” จะเข้าที่ “เบรกเกอร์หลัก” ก่อน (ในรูปเป็น MCCB 2P) เพื่อใช้เป็นจุดตัดตอนหลักทั้งบ้าน - จากเบรกเกอร์หลักค่อย “แยกไปตู้ควบคุม/ตู้ย่อย” 2 ตู้ (ชั้น 1 และชั้น 2) วิธีนี้ทำให้เวลามีปัญหาชั้นไหน จะตัดเฉพาะชั้นนั้นได้ ไม่ดับทั้งบ้าน - แต่ละตู้จะมี “เบรกเกอร์ย่อย (MCB)” แยกวงจร เช่น แสงสว่าง, ปลั๊ก, แอร์, ปั๊มน้ำ ฯลฯ 2) หลักการต่อ RCBO 2P แบบเข้าใจง่าย - RCBO 2P คืออุปกรณ์ที่รวม “กันดูด (RCD)” + “กันเกิน/ลัดวงจร (MCB)” และตัดพร้อมกันทั้งสาย L และ N - ขาเข้า (LINE/IN) รับไฟ L และ N จากเมน/จาก MCCB หรือจากตู้เมน - ขาออก (LOAD/OUT) จ่ายไปยังวงจรหรือไปยังตู้ย่อย (กรณีใช้ RCBO คุมทั้งตู้ชั้น) - จุดสำคัญมาก: นิวทรัล (N) ของวงจรที่อยู่หลัง RCBO ต้องกลับผ่าน RCBO ตัวเดิมเท่านั้น ห้ามเอาไปปนกับนิวทรัลของวงจรอื่น ไม่งั้นมีโอกาสตัดบ่อย/ทดสอบไม่ผ่าน 3) นิวทรัลบาร์และกราวด์บาร์ในตู้ (สิ่งที่คนมักต่อผิด) - “นิวทรัลบาร์ (Neutral bar)” ใช้รวมสาย N ของวงจรฝั่งโหลด โดยต้องจัดกลุ่มให้ถูกกับ RCBO ที่คุมอยู่ - “กราวด์บาร์ (Ground bar)” ใช้รวมสายดิน (PE) ของทุกวงจร - โดยทั่วไปในตู้ย่อยควรแยก N กับ PE ออกจากกันชัดเจน และให้กราวด์บาร์เชื่อมไป “หลักดิน” เพื่อความปลอดภัยตามที่เห็นใน OCR 4) มีรูปภาพตัวอย่างไหม / ดูอะไรในรูปถึงจะไม่พลาด จากผังตัวอย่าง ให้สังเกต 4 จุดนี้ - เส้นทางจากมิเตอร์ → MCCB 2P → แยกเข้าตู้ 2 ตู้ - แต่ละตู้มีเบรกเกอร์ย่อยของตัวเอง - มีนิวทรัลบาร์และกราวด์บาร์แยกกัน - มีการต่อไปยังหลักดิน (earth electrode) อย่างชัดเจน 5) เรื่องราคา (ให้เป็นแนวคิดคร่าว ๆ) ราคา RCBO 2P และอุปกรณ์ในตู้ขึ้นกับ “กระแสพิกัด (A)”, “กระแสรั่ว (เช่น 30mA)”, แบรนด์, มาตรฐาน และจำนวนวงจรย่อยครับ ถ้าจะประเมินให้ใกล้เคียง แนะนำทำรายการก่อนว่าแต่ละชั้นมีวงจรอะไรบ้าง (ไฟ/ปลั๊ก/แอร์/เครื่องทำน้ำอุ่น) แล้วค่อยเลือกขนาดเมนและจำนวนเบรกเกอร์ย่อย จะคุมงบได้ง่ายกว่า หมายเหตุ: งานไฟฟ้าเกี่ยวกับมิเตอร์/เมนหลัก ควรให้ช่าง/วิศวกรที่มีความชำนาญตรวจแบบและหน้างานจริงเสมอ เพื่อความปลอดภัยและให้ผ่านมาตรฐานครับ

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