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(6) Other Listed Electrodes
Related Code Sections
(6) Wiring and Protection, Other Listed Electrodes
Other listed grounding electrodes shall be permitted ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 250 Grounding and Bonding > 250.52 Grounding Electrodes > (A) Electrodes Permitted for Grounding > (6) Other Listed Electrodes
(B) Wiring and Protection, Through Spark Gap or Device
primary systems, the spark gap or listed device shall have a 60-Hz breakdown of not more than 3 kV, and there shall be at least one other ground ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 242 Overvoltage Protection > 242.54 Interconnections > (B) Through Spark Gap or Device