請益:電壓問題 - 居家修繕
By Doris
at 2011-03-28T18:15
at 2011-03-28T18:15
Table of Contents
家中的日光燈
(裝2燈管,但實際只用一個啟動器,只開一盞燈)
單切開關兩端接了一紅一黑兩條線
用三用電表(指針型)量得電壓
一端紅線 一端接地(門框金屬部分) :110v
黑線相同
一端紅線 一端黑線 :220V
推斷一條+110V 另一條-110V
但不知道怎麼用指針型電表確定誰正誰負
我沒接觸過220V的電器
不知道這是正常的配置嗎?
在此以前我以為普通電器的配電都是一條帶電線(火線) 另一條無電線(地線)
第一次遇到兩條都有電
想請問:
為什麼會形成兩線都有電壓?
這種情況要如何判定火線跟地線?
感謝!!
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Tags:
居家修繕
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