The shield of the shielded wire does not allow multi-point grounding because the different grounding points are always different and there is a potential difference at each point. If multiple points are grounded, a current is formed in the shielding layer, a current is formed on the conductor, and interference is formed on the signal line, which not only fails to shield, but introduces interference, especially in the case of many inverters, the interference contains A variety of higher harmonic components have a greater impact and should be given special attention.