The terms grounding and bonding are often used interchangeably also if they are a combined protective measure, having a distinct function. The terms need to be understood separately in order to correctly apply equipment in the most beneficial manner. The paper presents the IEC approach that highlights as the two functions are generally in combination and for this reason the IEC standard adopts the common term of protective conductor for the conductors that operate the function of grounding, bonding or both the two.