Holder for a protective conductor and cable tray with such holder for a protective conductor and protective conductor set

An earth wire holder for a cable tray having two spaced-apart side bars, wherein the earth wire holder is in the form of a spring clamp having a side bar receptacle enclosed by two mounting arms for connecting the spring clamp to the upper edge of a side bar and having an undercut earth wire receptacle enclosed by two holding arms, wherein, when the spring clamp is mounted on the upper edge of the side bar, the mounting arms bear against the side bar under prestress, and the spacing between the holding arms in the section thereof enclosing the earth wire receptacle is smaller than the diameter of the earth wire to be introduced therein.