re-bar bonding of slab 1st time user

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ablue

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I have been working in a townhome development for the last 2 years and now have been asked a question on the bonding of the re-bar in a mono slab situation if after the re-bar is bonded and the bare copper wire leaves the footing into the dirt does the bare copper wire requirer and sleeve over the copper aprox 8 inches long.

I have looked everywhere and asked all of my fellow trades people and they all feel the same as I do that they can not find anything that adresses this situation and they have never installed one there in any other areas that they work in
Could you please help me find the solution to my problum.
ablue
 
Did you read this? Welcome to the Forum.

250.64 Grounding Electrode Conductor Installation.

(B) Securing and Protection Against Physical Damage. Where exposed, a grounding electrode conductor or its enclosure shall be securely fastened to the surface on which it is carried. A 4 AWG or larger copper or aluminum grounding electrode conductor shall be protected where exposed to physical damage. A 6 AWG grounding electrode conductor that is free from exposure to physical damage shall be permitted to be run along the surface of the building construction without metal covering or protection where it is securely fastened to the construction; otherwise, it shall be in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, electrical metallic tubing, or cable armor. Grounding electrode conductors smaller than 6 AWG shall be in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, electrical metallic tubing, or cable armor.
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I agree with Pierre. It might be asdvisable to attend the next IAEI and/or BOAF meeting in your area. Both are held in the Orlando area on a monthly basis.
 
chris kennedy said:
Did you read this? Welcome to the Forum.
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Quote:
250.64 Grounding Electrode Conductor Installation.

(B) Securing and Protection Against Physical Damage. Where exposed, a grounding electrode conductor or its enclosure shall be securely fastened to the surface on which it is carried. A 4 AWG or larger copper or aluminum grounding electrode conductor shall be protected where exposed to physical damage. A 6 AWG grounding electrode conductor that is free from exposure to physical damage shall be permitted to be run along the surface of the building construction without metal covering or protection where it is securely fastened to the construction; otherwise, it shall be in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, electrical metallic tubing, or cable armor. Grounding electrode conductors smaller than 6 AWG shall be in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, electrical metallic tubing, or cable armor.


If I were going to protect it, I would try to avoid using a metallic sleeve because of the additional expense and hassle of 250.64(E) 2008
 
ablue said:
I have been working in a townhome development for the last 2 years and now have been asked a question on the bonding of the re-bar in a mono slab situation if after the re-bar is bonded and the bare copper wire leaves the footing into the dirt does the bare copper wire requirer and sleeve over the copper aprox 8 inches long.

I have looked everywhere and asked all of my fellow trades people and they all feel the same as I do that they can not find anything that adresses this situation and they have never installed one there in any other areas that they work in
Could you please help me find the solution to my problum.
ablue
Click to expand...

normally, when i bring a ground cable out of a slab or footing, i'll sleeve
the conductor in a piece of 3/4" PVC, spray paint it orange, and mark
UFER on it.... keeps the conductor clean, cement free, and undamaged
until i am ready to do the install.... where i've had to put a piece of 4/0
copper or something larger in the slab, i'll leave the tail unskinned, coil
it up, hope it doesn't get cut off and stolen :D and skin it later.

if it's a substation, then usually grounds will cadweld into a ground spool
that is set flush with finished concrete.
 
ablue said:
I have been working in a townhome development for the last 2 years and now have been asked a question on the bonding of the re-bar in a mono slab situation if after the re-bar is bonded and the bare copper wire leaves the footing into the dirt..
Click to expand...

Hi ablue,
The method is somewhat unorthodox in standard construction for UFER stub-ups coming out from the slab side "into the dirt" from what you have described. Unless the copper GEC exits at the base and is in a slab with a very high stemwall, bringing the electrode conductor (minimum 4 AWG) up from the foundation through the framing sill plate into the wall to the Main disconnect panel should be okay. The short distance up to the sill plate should work without needing additional raceway protection. [250.64(B)]GEC Protection

I am going by your description using a slab pour that is usually 6" above finish grade, so let me know if the configuration varies drastically. rbj
 
CEE location

CEE location

After responding to your other thread, looking at the Article 250.52 (3) Concrete-Encased Electrode states that "an electrode encased by at least 2" of concrete located horizontally near the bottom or vertically, and within the portion of a concrete foundation or footing that is in direct contact with the earth" means that the GEC must be above the soil before it exits the concrete. If the GEC location complies, then my previous comments are compliant to the Article 250.52.

If the GEC exits into the soil, I believe this is contrary to the mentioned code and conduiting will not be sufficient unless a sealed GEC from the exit is continued to above the grade. I have not ever had a condition as mentioned and I can see why the question would arise. In this case, consulting the AHJ would be the best approach for an allowance. rbj
 
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