The pole of the output voltage is connected to the balance housing, which can be grounded for operation.
输出电压的负极与电子天平壳体连接。在进行操作时，电子天平壳体允许接地。
3
That's why a squirrel can run across an electrical line, but sadly die when its foot makes contact with the (grounded) transformer on the pole at wire's end.