08-03-2011 11:20 AM
Bonding the rebar in any equipment foundation/slab (GSU transformers, HRSG, CTG, etc)to the grounding grid is very clear identified and addressed in IEEE 665 and 142. NEC 2008 is clear in connecting the rebar to the grounding grid. art 250. NESC-2007 is addressing this question in section 9. rule 094. The benefit is not only in having a low grounding resistance, but also a good lightning protection. Can somebody explain why electrical designers do not adhere to this idea, and oppose this. What could go wrong in doing this?
09-27-2011 04:23 AM
It is always good to have the foundation reinforcements bonded to the UG Earthing Grid increasing the contact area and also reducing potential difference during a fault but some civil guys don't like this and don't know the reason.