Ground Rise Potential (GRP) occurs in every instance in which an earthed network becomes live.
It may not always be possible to protect the pole top worker and the ground worker simultaneously.
The inclusion of jointed steelwork in the short circuiting current path will result in slower tripping times and less protection for workers.
Current flows in all current paths. (Ohms Law)
The presence of induced voltage may vary from day to day, hour to hour or minute to minute.
Numerous tests prove that grounding a machine provides no protection to ground workers or machine operators.