Services & DistributionQuestion 6 of 521
What is the minimum length that a ground rod electrode must be in contact with the soil?
a.6 ft (1.8 m)
b.8 ft (2.44 m)
c.10 ft (3.0 m)
d.4 ft (1.2 m)
Explanation
Section 250.53(G) requires that a rod be installed so at least 8 ft (2.44 m) of length is in contact with soil. The other lengths do not meet the code minimum for a driven rod electrode.
Law Reference: 2023 NEC §250.53(G)Practice all 521 questions free — no signup required.
Related questions on this topic
- The only grounding electrode is a concrete-encased electrode (Ufer). What is the largest copper GEC that must be run to it?
- A feeder is protected by a 100 A overcurrent device. Per Table 250.122, what is the minimum copper equipment grounding conductor (EGC)?
- What is the minimum copper EGC for a circuit protected by a 200 A breaker, per Table 250.122?
- A single ground rod is installed. Under what condition is a supplemental electrode NOT required?
- A ground ring is used as a grounding electrode. What is the minimum size and length required?
- Service-entrance conductors are 3/0 AWG copper. Per Table 250.102(C)(1), what is the minimum copper main bonding jumper?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-10 Electrical Trade Examination · How we review