Question 1 of 10
What is the primary purpose of grounding an electrical system?
Grounding helps stabilize voltage and provides a path for fault currents to prevent shocks and fires.
Question 2 of 10
Which NEC Article primarily covers grounding requirements?
NEC Article 250 outlines the specific regulations and guidelines for grounding and bonding electrical systems.
Question 3 of 10
What is the minimum length of a grounding rod in contact with the soil, as per NEC?
NEC 250.53 requires a minimum of 8 feet of the grounding rod in direct contact with the soil.
Question 4 of 10
If a single grounding rod's resistance to ground measures more than 25 ohms, what action must be taken?
If the resistance exceeds 25 ohms, a second grounding rod must be installed, as per NEC 250.53.
Question 5 of 10
What is the purpose of the Main Bonding Jumper (MBJ)?
The MBJ connects the neutral and ground bus bars in the main service panel, establishing a single point of grounding.
Question 6 of 10
Where is the Main Bonding Jumper (MBJ) installed?
The MBJ is only installed in the main service panel to ensure proper grounding and bonding.
Question 7 of 10
What is the function of the Grounding Electrode Conductor (GEC)?
The GEC connects the grounding electrode (ground rod) to the grounding bus bar in the main panel.
Question 8 of 10
What wire color or type typically identifies an Equipment Grounding Conductor (EGC)?
EGCs are typically bare copper or green insulated wires.
Question 9 of 10
Which NEC table is used to determine the correct size of the Grounding Electrode Conductor (GEC)?
NEC Table 250.66 is used to size the GEC based on the service-entrance conductor size.
Question 10 of 10
What is a common mistake to avoid when installing a subpanel?
Bonding the neutral and ground in a subpanel creates objectionable current and is a dangerous violation.
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