这个图是在西人网站上看到的,今天上午出题的人写了:This issue is with the tandem breaker. The tandem breaker is a single pole device, both breakers are being supplied from the same 120V feeder. The shared neutral (grounded conductor) is carrying the combined load of both circuits, which in a worst case scenario can place over 30A load on a 14AWG conductor and it has no overcurrent protection.
所以我也明白了,大伙看看是是不是这个意思:这个breaker和现在的不一样,就是从一个火线出来的,也就是说,后面的红黑线不是180度240v,是0v。呵呵
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