GROUNDING ELECTRODE CONDUCTOR

1. Grounding Electrode Conductor (GEC), NEC 100-A: Is the conductor used to connect the Grounding Electrode to the equipment grounding conductor, to the grounded conductor, or to both, of the circuit at the service equipment or at the source of separately derived system. It is required to be copper, aluminum or copper-clad aluminum. ,
   
   
2. Sizing of the Grounding Electrode Conductor (GEC): Based on the size of service feeders. The GEC size is determined per NEC, Table 250-66. See exception #1 for Grounded Systems.
   
   
3. GEC Materials, NEC 250-62: Copper, aluminum or copper-clad aluminum.
   
   
4. A #6 or larger grounding conductor that is securely-fastened to the building construction, free from exposure to physical damage, may be run along the surface of the building without metal covering or protection. Otherwise, installation required in a rigid metal conduit, EMT, rigid nonmetallic conduit or IMC is required. 250-64(b).
   
   
5. Metal Underground Gas Piping, NEC 250-52(a): Not to be used as the Grounding Electrode.
   
   
6. "UFER" Electrode System (One of the Grounding Electrode Systems [GES]), NEC 250-50(c): An electrode encased by at least 2" of concrete, located within and near the bottom of a concrete foundation or footing, that is direct contact with earth, consisting of at least 20 ft. of one or more bare steel reinforcing bar or rod at least 1/2" in diam. (#4 rebar), or consisting of at least 20 ft. of bare copper conductor not smaller than #4.  , ,
   
   
7. Grounding using metal conduit.