What is a possible cause of high voltages that produce RF burns?
Flat braid rather than round wire has been used for the ground wire
Insulated wire has been used for the ground wire
The ground rod is resonant
The ground wire has high impedance on that frequency✓الإجابة الصحيحة
الشرح
A ground wire is only a ground at frequencies where its impedance is low, and at HF a wire of appreciable length has substantial inductive and transmission-line impedance. RF current flowing through that impedance develops a voltage across it, and that voltage appears on the equipment where it can cause burns.