IEC60335-27.6

ranshudeng

27.6 The printed conductors of printed circuit boards shall not be used to provide earthing
continuity in hand-held appliances. They may be used to provide earthing continuity in other
appliances if at least two tracks are used with independent soldering points and the appliance
complies with 27.5 for each circuit.

这句话该作何解释呢？熟悉的朋友来解读一下。

gamy

焊点是不可靠的，所以在印制线路板提供保护接地连续性就要多提供一条独立的电阻符合要求的接地回路；手持式器具晃得利害，这种焊点接触不良的故障机会大大增加，就不要在印制线路板提供保护接地连续性。