![]() Where the grounding electrode conductor or bonding jumper connected to a single or multiple concrete-encased electrode(s), as described in Section E3608.1.2, 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 conductor. Where the grounding electrode conductor or bonding jumper connected to a single or multiple rod, pipe, or plate electrode(s) or any combination thereof, as described in Section E3608.3, 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 6 AWG copper or 4 AWG aluminum.(Table 250.102(C)(1) So, I would require a 4/0 copper grounding electrode conductor. However, 250.104 requires a 4/0 copper for metal water piping ran throughout the building. The supports shall be spaced not more than 24 inches on center and shall be within 12 inches of any enclosure or termination. A grounding electrode conductor to the underground water pipe is required to be 3/0 copper per 250.66. Where not protected, 6 AWG grounding electrode conductor shall closely follow a structural surface for physical protection.An 8 AWG grounding electrode conductor shall be protected with rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride (Type PVC) nonmetallic conduit, rigid thermosetting resin (Type RTRC) nonmetallic conduit, electrical metallic tubing or cable armor. EGCs come in various sizes, types, and materials as found in the 2020 NEC, Section 250.118. ![]() Where protected by a ferrous metal raceway, grounding electrode conductors shall be electrically bonded to the ferrous metal raceway at both ends.Where there are no service-entrance conductors, the grounding electrode conductor size shall be determined by the equivalent size of the largest service-entrance conductor required for the load to be served. While all of Article 250 is crucial to a safe installation, many installation errors evolve from incorrectly using the tables that size grounding electrode conductors, bonding jumpers, and equipment grounding conductors.If multiple sets of service-entrance conductors connect directly to a service drop, set of overhead service conductors, set of underground service conductors, or service lateral, the equivalent size of the largest service-entrance conductor shall be determined by the largest sum of the areas of the corresponding conductors of each set. ![]()
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