What exactly does protective impedance mean?

Discussion in 'General Electronics Chat' started by erlend, Mar 19, 2011.

  1. erlend

    Thread Starter Member

    Feb 8, 2008
    My basic understanding is that it's the same as allowing the current to go down another route, other than a person. Basically I'd like to know if the earth-cable in UK plugs is there to provide "protective impedance"?


  2. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    I believe I've heard the term once, and that was in reference to the insulative jacket on cabling. Based on that then, it would mean sufficient impedance to prevent, or limit current flow where not intended. This makes sense in regards to 'impedance' relating to resistance. Your example is more about conductance, or the lack of impedance. So myself, I wouldn't the term 'protective impedance' to describe your bonding wire.