NEC 2026 Compatible

A service entrance is supplied with 400 kcmil copper conductors. What is the minimum size aluminum or copper-clad aluminum grounding electrode conductor required to be connected to a building steel electrode?

Journeyman Level📋 NEC Table 250.66Grounding Electrode Conductor Sizing
Circuit Diagram
Service Entrance — NEC Article 230 Utility XFMR 7200V:240V Service Drop (overhead) Weatherhead Clearances 230.24(B) 10ft min over sidewalk M Meter MAIN DISC 200A 230.70 SERVICE PANEL 120/240V 200A MLO GE Rod 250.52 Grade GEC 250.64
A

No. 2/0 AWG aluminum

B

No. 1/0 AWG aluminum

C

No. 3/0 AWG aluminum

D

No. 4/0 AWG aluminum

Explanation & Direct Citation

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