Grounding/Bonding of Rebar

[mshields]

It's been a while since I've crossed this bridge so to speak. So I get that 250.50 requires all non-carrying metal objects to be bonded to the GES and that 250.68(C)(3) requires that rebar extending from the slab should not be in contact with the ground nor otherwise subject to corrosive environments. My questions are these.

1. Does the rebar require a specific number of connections.
2. Should I have th3e GC leave exposed rebar immediately adjacent to steel column and make exothermic weld there.
3. I remember when this first became an issue, coiling up 20 feet of 3/4 bare copper and putting it underneath steel columns with no direct connection. This always seemed odd. Is it still a viable option (if it ever was)?
4. Any thoughts on what the best way is to meet this requirement.


Thanks,

Mike

 

[petersonra]

Start by reading very carefully what 250.50 actually says.

 

[don_resqcapt19]

If the rebar is connected to the j-bolts for the columns, all you have to do is connect the GEC to the column.