The County and local inspector said that is Ok for they are enforcing the 2008 National Electrical Code., but the electrical contractor is installing the electrical system with the 2011 NEC.Conflict?. I am having a home built and I know for sure that the vapor barrier is under the footer. To test the CEE you need a Ground Resistance Tester and a megger or ohm meter will not work. According to the NEC it must be less that 25 ohms. As it stands now nobody can tell me that with the vapor barrier installed what the resistance to earth is. In the 2011 NEC with the revision to NEC article 250.52.(A)3 they are looking for greater surface area to be in direct contact with the earth. Yet, the Electrical Contractors are installing Arc fault circuit breakers and tamper proof devices, which I do not think they were required in the 2008 codes, go figure? Anyway, a true CEE need to be less that 25 ohms to be effective. SO here we have a conflict in that as the Legislators drag their feet to amend the State building codes we must settle for second best. If the grounding electrode conductor or bonding jumper connected to a single or multiple concrete-encased electrode(s), as described in 250.52(A)(3), does not extend on to other types of electrodes that require a larger size of conductor, the grounding electrode conductor shall not be required to be larger than 4 AWG copper wire. 2017 Code Language: 250.68 (C) Grounding Electrode Conductor Connections. Another resource would be the green book, IEE Standard for grounding. (3) A concrete-encased electrode of either the conductor type, reinforcing rod or bar installed in accordance with 250.52 (A) (3) extended from its location within the concrete to an accessible location above the concrete shall be permitted. This informational not states " Concrete installed with insulation, vapor barrier, films or similar items separating the concrete from the earth is not considered to be in direct contact with the earth". In the current edition of the 2011 NEC article 250.52.(A)3 has a revision included which is entitled " Informational Note". In the 2008 NEC Article 250.52(A)3 identifies the requirement for a CEE. With that being said lets talk about the Concrete Encased Electrode (CEE). In Florida we are working from the 2008 National Electrical Code (NEC). As such the State Legislators must pass timely manner (yea.OK) amendments to update to the current codes. First off the State of Florida (and a few other States) are a self insured municipality.
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