Question 1 of 10
According to NEC Table 250.66, what is the minimum size copper grounding electrode conductor (GEC) required for a service with a 2/0 AWG ungrounded conductor?
Referring to NEC Table 250.66, a 2/0 AWG ungrounded conductor requires a 4 AWG copper GEC.
Question 2 of 10
What is the primary purpose of the Grounding Electrode Conductor (GEC)?
The GEC's primary purpose is to provide a safe path to the earth to limit voltage caused by lightning strikes, power line surges, and unintentional contact with high-voltage lines.
Question 3 of 10
What is used to determine the size of the grounding electrode conductor (GEC)?
The size of the GEC is determined by the size of the largest ungrounded conductor in the system, according to NEC Table 250.66.
Question 4 of 10
If multiple sets of service-entrance conductors are used in parallel, how is the 'Size of Largest Ungrounded Conductor' determined for GEC sizing?
The 'Size of Largest Ungrounded Conductor' is determined by the equivalent area of the parallel conductors added together.
Question 5 of 10
In the 2020 NEC, what term was removed from the table title related to GEC sizing?
In the 2020 NEC, the term "service-entrance" was removed from the table title because the table applies beyond just services.
Question 6 of 10
Which of the following scenarios would still require the full GEC sizes listed in Table 250.66?
Full values from Table 250.66 must be used when connecting to underground metal water pipes.
Question 7 of 10
If the service-entrance conductors are not yet installed, how is the GEC size determined?
When service-entrance conductors aren't yet installed, determine GEC size based on the equivalent size of the largest conductor required for the load.
Question 8 of 10
What is the maximum size (often) of a copper GEC when connecting to a ground rod?
The maximum required size is often limited to 6 AWG copper for ground rods, as per Section 250.66(A).
Question 9 of 10
Which of the following is NOT a type of grounding electrode mentioned in the article?
Equipment grounding conductor (EGC) is distinct from the grounding electrode system (GES) to which the GEC connects.
Question 10 of 10
What is the GEC connected to?
The GEC connects the system grounded conductor or equipment to the grounding electrode system.
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