Electrode Conductors, AFCIs and More

摘要

Q: Does the National Electrical Code (NEC) permit a grounding-electrode conductor smaller than 4 AWG copper for a concrete-encased electrode for a 60-ampere, 3-wire, 120/240-volt service? The service conductors are three 6 AWG copper with THWN insulation.rnA: There is nothing in Article 250 that allows the grounding-electrode conductor to be smaller than 4 AWG copper. There also is nothing in Article 250 that requires the grounding-electrode conductor from the reinforcing steel to be larger than 4 AWG copper.