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City of Alexandria, VA City of Alexandria, VA
Code Administration
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Page updated Jan 11, 2012 8:32 AM
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Contractor Information

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Contractor Alert! Contractors performing renovation, repair and painting projects that disturb lead-based paint in homes, child care facilities, and schools built before 1978 must be certified and must follow specific work practices to prevent lead contamination. Learn more here.

Attention Building & Electrical Contractors -  Concrete Encased Electrode Inspections

In accordance with the National Electrical Code®, if the building footing has rebar in concrete that is in contact with the earth you are required by NEC® Section 250.52(A)(3) to use this electrode or bond to this electrode from other present electrodes. Below is a copy of what the National Electrical Code® is asking you to do.

"250.52(A)(3) Concrete-Encased Electrode. An electrode encased by at least 50 mm (2 in.) of concrete, located horizontally near the bottom or vertically, and within that portion of a concrete foundation or footing that is in direct contact with the earth, consisting of at least 6.0 m (20 ft) of one or more bare or zinc galvanized or other electrically conductive coated steel reinforcing bars or rods of not less than 13 mm (1⁄2 in.) in diameter, or consisting of at least 6.0 m (20 ft) of bare copper conductor not smaller than 4 AWG. Reinforcing bars shall be permitted to be bonded together by the usual steel tie wires or other effective means. Where multiple concrete-encased electrodes are present at a building or structure, it shall be permissible to bond only one into the grounding electrode system."

When building contractor schedule an inspection of footer(s)be sure to install a properly constructed "Concrete Encased Electrode" sometimes refered to as a "UFER" from the rebar (with a properly listed clamp) to the service disconnection means grounded conductor location via a minimum 4 AWG copper GEC (Grounding Electrode Conductor) conductor. Our inspectors will be looking for this "Concrete Encased Electrode" on all footing inspections that rebar is present within the footing. ( Note: if a vapor barrier is installed under the footing so that the footer is not in direct contact with the earth then you do not have a Concrete Encased Electrode and it can't be used for your grounding electrode. If at any point you have questions please feel free to give us a call for more details)

If you are confused or need assistance in learning more about Concrete Encased Electrodes, please call Supervisor Abernathy at 703.906.2371.

                                                                                    * Above is an example of a properly installed Concrete Encased Electrode                                                                                  

 

Tighten the setscrew

 

* Examples of two listed clamps ( Acorn Clamps are not acceptable unless listed for the application )

 

Attention Customers : Please be aware that on Thursdays field inspectors may be attending in-house training on the National Electrical Code® from 8:30-9:30 AM. If you are requesting an inspection on those Thursdays, please be aware that the inspectors will be getting into the field a bit later than normal. Thank you in advance for your patience. (P.S. This training is open to Electrical Contractors who would like to attend.)

301 King St., Suite 4200
Alexandria, VA 22314
703.746.4200
Fax: 703.838.3880

Office Hours:
Monday - Friday
8 a.m. - 5 p.m.

Virginia Paving Hotline
703.906.9918