The Reason Why The Motor Housing Is Electrified

1) The power cord and grounding wire are wrong
2) The motor winding is damp, and the insulation aging reduces the insulation performance
3) The lead wire touches the junction box
4) The local winding insulation damage makes the wire touch the shell
5) The iron core is loose and stabs the wire
6) The ground wire fails
7) The terminal board is damaged or the surface is too oily