Ok, I seem to always work in an are 1

[buzzp]

Ok, I seem to always work in an area I haven't before. I am looking for good grounding/bonding references. I already know about Soares Book on Grounding and IEEE 142 (they are on order). The reason being the new company I started at has an electrician that was told at sometime in the past that a ground rod was needed every 60', tied to the structural steel of concrete structures as tall as 180'. Since I have already made waves here and demanded changes to comply with code, I relaxed on this one, for now. There is no need for this from the NEC's perspective but am trying to figure out why the electrician may have been told this. I have the two references above on order but wanted to see if I should be looking at a different standard/reference for this. From an engineering standpoint, the additional ground rods do nothing if the steel is all tied together and the resistance to ground is the 25 ohms or less. Anyway, anyone ever heard of this or point me to a reference that may recommend this type set-up? Thank you.

 

[jghrist]

Try looking at NFPA-780. It might be a requirement for lightning protection.

 

[buzzp]

Yes, thanks for that reference too! I forgot to list that one.