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儲熱式電熱水器使用線徑問題
Sep 14th 2013, 18:18

小弟新買一台數位儲熱式電熱水器,單相220V,加熱時18安培4KW,每次加熱時間大約20~30分鐘,電纜大約要拉15米遠,沒走管線架空在輕鋼架上。

現在問題是

一個師傅說架空散熱比較好所以裝20A無熔絲開關+3.5MM就可以了,

另一個說要30A無熔絲開關+5.5MM才可以.....

請問一下哪個才是比較正確的接法呢~!?

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