接地、觸電與修改後的法規 - 居家修繕
By Steve
at 2021-04-10T14:37
at 2021-04-10T14:37
Table of Contents
https://youtu.be/LeRpS6nza-E
先花四分鐘看完以上各種接地系統
接著看最新法規第24條第四款第(一)目
第 24 條 接地系統之接地方式及搭接依下列規定之一辦理:
四、有效接地故障電流路徑:
(一)可能帶電之用電設備、用電器具、配線及其他導電體,應建立低阻
抗電路,使過電流保護裝置或高阻抗接地系統之接地故障偵測器動
作。
這裡的低阻抗電路指的就是 TN Earthing system
其故障電流很大,採用過電流保護裝置即可切斷
高阻抗接地系統指的是 TT Earthing system
高阻抗接地系統之接地故障偵測器指的就如漏電斷路器
以上的立法精神就是我說的漏電必須靠保護裝置來切斷火線
而讓裝置即時切斷火線必須靠正確的接地
傳言接地可以讓電器漏電時摸到也不會觸電
這對絕大部分的情況來說是錯誤的
就連阿信助教也說錯了
可見這個說法多麼根深蒂固
https://www.strongpilab.com/three-prong-plug-neutral-power-line/
阿信助教在以上這個連結說:
"一般來說這條接地線是不會有電流的,若設備接地的導線上有電流,那表示負載內部的某
個地方與機殼短路short了(俗稱漏電,如上圖Motor右方紅點處),而這條設備接地線的作
用就是將短路的故障電流S導入大地,而且電壓與大地相同,機殼右方的人員就不會觸電
了。"
故障電流導入大地這是 TT 做法,必須裝設漏電斷路器
光靠過電流保護可能不會動作,使得漏電狀態一直存在
人去摸到外殼會被電到,除非人體有做絕緣
因有故障電流的存在,接地的外殼也不會與大地等電位
阿信助教在這個影片也重覆這個錯誤的說法
https://youtu.be/sbU5V2u3q6o?t=439
直接看7:20處
若從他畫的等效電路來看 (暫且當作這個等效電路是正確的)
流經人體的電流是 110V/10000Ω = 11 mA
11毫安培絕對很有感,應該說電到哇哇叫
--
接著看最新法規第24條第四款第(一)目
第 24 條 接地系統之接地方式及搭接依下列規定之一辦理:
四、有效接地故障電流路徑:
(一)可能帶電之用電設備、用電器具、配線及其他導電體,應建立低阻
抗電路,使過電流保護裝置或高阻抗接地系統之接地故障偵測器動
作。
這裡的低阻抗電路指的就是 TN Earthing system
其故障電流很大,採用過電流保護裝置即可切斷
高阻抗接地系統指的是 TT Earthing system
高阻抗接地系統之接地故障偵測器指的就如漏電斷路器
以上的立法精神就是我說的漏電必須靠保護裝置來切斷火線
而讓裝置即時切斷火線必須靠正確的接地
傳言接地可以讓電器漏電時摸到也不會觸電
這對絕大部分的情況來說是錯誤的
就連阿信助教也說錯了
可見這個說法多麼根深蒂固
https://www.strongpilab.com/three-prong-plug-neutral-power-line/
阿信助教在以上這個連結說:
"一般來說這條接地線是不會有電流的,若設備接地的導線上有電流,那表示負載內部的某
個地方與機殼短路short了(俗稱漏電,如上圖Motor右方紅點處),而這條設備接地線的作
用就是將短路的故障電流S導入大地,而且電壓與大地相同,機殼右方的人員就不會觸電
了。"
故障電流導入大地這是 TT 做法,必須裝設漏電斷路器
光靠過電流保護可能不會動作,使得漏電狀態一直存在
人去摸到外殼會被電到,除非人體有做絕緣
因有故障電流的存在,接地的外殼也不會與大地等電位
阿信助教在這個影片也重覆這個錯誤的說法
https://youtu.be/sbU5V2u3q6o?t=439
若從他畫的等效電路來看 (暫且當作這個等效電路是正確的)
流經人體的電流是 110V/10000Ω = 11 mA
11毫安培絕對很有感,應該說電到哇哇叫
--
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居家修繕
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