NEC Article 250 Grounding.
Table 250.102(C)(1). Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems.
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I like this chart but still I don't know what AWG is used for 400A : r/electricians
310.15(B)(7) 120/240-Volt, Single-Phase Dwelling Services and Feeders.
Wire Gauge Chart — Big Jeff Online Inc
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Residential Electrical Service Grounding Requirements
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Table 250.66 Grounding Electrode Conductor for Alternating-Current Systems.
Sizing of Conductors Related to Grounding & Bonding – IAEI Magazine
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400 AMP residential ELECTRIC SERVICE using TWO parallel 200 AMP service ENTRANCES (076) - YouTube
