我估计有两个可能.

来源: smlandlord 于 2024-03-15 01:22:32 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

1. 灯的零线和火线 acrossed or reversed.

2. Possible that some very old house wirings not have a neutral.

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