Ufer and 250.52 (A) (3)

[mphillipps]

Does the 20 ft of 1/2" rebar need to be continuous or can I use (for example) 2 - 10 foot sections connected with #4 AWG bare copper?
The structure I'm working with is only 20' long. Unless we place a rebar diagonally we don't have a continuous 20' length of rebar.

 

[ActionDave]

You can use twenty one foot sections all tied together and be legal. You don't have to use a #4 jumper either, steel tie wire is fine.

Also you could run twenty feet of #4cu in the footer and add five or so feet to land in the panel after the building is up.

 

[mphillipps]

Would it be better to run #4 cu from the rebar, up to through the foundation or have the rebar come up through the foundation and connect the #4 to it in the wall bay?

 

[iMuse97]

Would it be better to run #4 cu from the rebar, up to through the foundation or have the rebar come up through the foundation and connect the #4 to it in the wall bay?

I like the copper to exit the concrete, leaving the rebar encased, since copper does not oxidize significantly in comparison to steel.

 

[ActionDave]

Either way is fine. I try to get the #4 into the footer when I can, but that is not always possible.