Question- how does the reliability index play a role? As you know reliability is my primary concern.A straw-man argument. That is not practice by standards but practice by experience in certain areas. The standard is still 4/mile plus at equipment poles. In today's world of broken grounds and wire theft we see many utilities practice grounding every primary pole in places. This will vary, even internally to an individual utility. Soil conditions, lightning frequency, population density, economics, reliability index, etc. all play a role.