26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. On the US market, a 5. The National Electrical Code (NEC) provides clear guidelines for ground wire sizing through Table 250. 122, but understanding how to apply these requirements correctly can make the difference between a safe installation and a costly code violation. Proper grounding conductor sizing is critical for. A ground wire size chart that follows will tell you exactly the size of the grounding conductor you need. Now, it's important to understand that you cannot go wrong with a bigger-than-required ground wire. With smaller wires (8. Example Question: What is the minimum size copper service neutral conductor required when the service phase conductors are 4/0 AWG? (a) 3 AWG (b) 2 AWG (c) 1 AWG (d) 1/0 AWG 2 AWG [Table 250.
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