Services, Grounding & Bonding第 33 / 120 题
Where the grounding electrode conductor connects only to a driven ground rod, what is the largest size it is required to be?
a.2 AWG copper
b.4 AWG copper
c.6 AWG copper
d.1/0 AWG copper
解析
A rod, pipe or plate electrode has a limited earth contact area, so the conductor to it is never required to be larger than 6 AWG copper regardless of what Table 250.66 would otherwise demand. The 4 AWG limit applies to a concrete-encased electrode, and larger sizes are not required for any rod connection.
法律依据: 2023 NEC §250.66(A)免费刷完整 120 道题库 — 无需注册。
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