I have seen different kind of grounding system for steel buildings. In addition to the ground electrodes of ground rods to main ground busbar, Main water pipe, and concrete encased rebar in slab.
I have seen steel structure been used as one of the electrodes. My question regarding this is how many steel columns need to be grounded using ground rod. Let's say 100 columns in total for the building, how many of them need to be grounded with ground rod? Can I just ground one column?
I have see copper ground loop around the building installed as one of the electrodes. My question is why we need spend the money to install the ground loop. Is this necessary even we have other ground electrodes already?
I understand if the building has lightning protection system, an electrical ground loop around the building is necessary.
What do you think?
Thanks.
I have seen steel structure been used as one of the electrodes. My question regarding this is how many steel columns need to be grounded using ground rod. Let's say 100 columns in total for the building, how many of them need to be grounded with ground rod? Can I just ground one column?
I have see copper ground loop around the building installed as one of the electrodes. My question is why we need spend the money to install the ground loop. Is this necessary even we have other ground electrodes already?
I understand if the building has lightning protection system, an electrical ground loop around the building is necessary.
What do you think?
Thanks.