主斷路器和分支斷路器同時跳閘


7

我住在70年代(美國)建造的高層公寓裡,今天下午,我們突然失去了所有力量,只剩下我們的單位。經過一番調查,我們發現為設備供電的主斷路器(70A)跳閘了。當我查看自己的負載中心時,烤箱/範圍斷路器(50A)也跳閘了。

我們沒有做任何不尋常的事情-烤箱開著,有些燈亮了,但是我們經常有洗碗機/燈/吹風機/等。同時運行。我發現50A和70A同時跳閘很奇怪。有誰知道為什麼會這樣?

如果需要的話,我已經將一些LED燈泡安裝到了不適合LED的調光器中(與烤箱/爐灶電路位於不同的電路上),並且其中一些燈泡當時處於打開狀態。似乎這並不重要,但這是我唯一能想到的。

更新-找到了根本原因!結果表明,灶具和灶台在櫃子中的一個盒子中用金屬絲螺母組合在一起,然後一條管線通向50A斷路器。其中一個連接中的導線使塑料熔化並短路,從而使斷路器跳閘。

當前,我們僅連接了爐灶面,因為需要大量工作才能使設備達到當前代碼(最近的改型是10年前)。他們必須將面板移到壁櫥外面,並增加尺寸,因為所有當前空間都增加了一倍。

大屠殺的照片-感謝張貼海報的人,他告訴我保持斷路器關閉!enter image description here

22

Very simple: Massive power overload from the oven.

The 70A and 50A tripping at the same time means:

  • Problem is past the 50A. Since that has just one appliance, we know the source of the overload.
  • Since 70A tripped, must be greater than 70A, which of course is also greater than 50A.
  • Since breakers are generally designed with a thermal trip curve to avoid trips from motor startup and similar short surges, this was likely far more than 70A, because if it was 71A it would trip the 50A quickly but not the 70A.

My guess is an element (oven or cooktop) failed but short circuited along the way, tripping the breakers.

I'd be extremely wary of turning on the 50A (the 70A is fine) without getting the oven checked by a professional first. If you're in a rental, call the landlord.