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#100661 - 12/08/06 05:20 PM Garage re-bar bonding
kencr Offline
Member

Registered: 07/25/04
Posts: 36
Loc: Southern, NJ USA
I am actually building my own garage, and I have not bonded rebar in a footing before .. most times it is done by the concrete crew ?? I assume that .. not sure.

Any way ... what type of clamp is approved for that ? And what size copper wire ? # 6 bare I am guessing. The garage will have a 100 amp sub panel feed from the house panel.
Thanks for your replies

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#100662 - 12/08/06 05:26 PM Re: Garage re-bar bonding
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9065
Loc: Estero,Fl,usa
4ga solid and any clamp listed for burial in concrete and connection to rebar. The bronze one they use in pools is common and Erico has a bronze acorn that works
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#100663 - 12/09/06 02:12 AM Re: Garage re-bar bonding
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
We use bare stranded, much easer to work with.
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Construction & Maintenance Electrician
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#100664 - 12/09/06 05:41 AM Re: Garage re-bar bonding
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
gfretwell,
Quote:
4ga solid and any clamp listed for burial in concrete and connection to rebar.

Why #4?
Don
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#100665 - 12/09/06 12:21 PM Re: Garage re-bar bonding
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9065
Loc: Estero,Fl,usa
250.66(B)Connections to Concrete-Encased Electrodes. Where the grounding electrode conductor is connected to a concrete-encased electrode as permitted in 250.52(A)(3), that portion of the conductor that is the sole connection to the grounding electrode shall not be required to be larger than 4 AWG copper wire.
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#100666 - 12/09/06 01:03 PM Re: Garage re-bar bonding
electure Offline


Member

Registered: 12/24/00
Posts: 4229
Loc: Fullerton, CA USA
But that doesn't say that it cannot be smaller than #4, only that it needn't be larger.

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#100667 - 12/09/06 02:14 PM Re: Garage re-bar bonding
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9065
Loc: Estero,Fl,usa
I agree but when you are casting something in concrete for your own house, why cheap out?
By the time you add physical protection for a smaller size you probably haven't saved any money anyway.
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#100668 - 12/09/06 04:37 PM Re: Garage re-bar bonding
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
Another reason to go for #4. It seems to fit in a portion of this code between (*) pysical damage, and severe physical damage.

Quote:
250.64(B) Securing and Protection from Physical Damage. A grounding electrode conductor or its enclosure shall be securely fastened to the surface on which it is carried. A 4 AWG copper or aluminum or larger conductor shall be protected if exposed to severe physical damage. (*) A 6 AWG grounding 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 conductors smaller than 6 AWG shall be in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, electrical metallic tubing, or cable armor.


[This message has been edited by e57 (edited 12-09-2006).]
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#100669 - 12/09/06 09:15 PM Re: Garage re-bar bonding
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
The code would permit a #8 GEC for this application. The #4 is the maximum required by the code for a GEC to a concrete encased electrode, but Table 250.66 applies and the use of smaller conductors is permitted. The smaller wire may not require and physical protection. It could be stubbed up in a stud space and run to the panel. If there is a wall finish no additional protection would be required.
Don
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