20 Questions
What are the three primary threats that a grounded system must protect against?
Lightning, voltage surges higher than the circuit is designed for, increase in maximum potential to ground due to abnormal voltage
Describe the requirements for an underground metal water pipe to be considered part of the grounding electrode system.
The underground metal water pipe must be in direct contact with the earth for at least 10 feet (3 meters).
What is the purpose of a ground ring encircling a building or structure in the grounding electrode system?
The ground ring provides a path for fault currents to dissipate safely into the earth.
What materials are commonly used for the grounding electrode conductor?
Copper, aluminum, or copper-clad aluminum
When installing the grounding electrode conductor, what are the requirements in terms of splices or joints?
The conductor must be in one continuous length without a splice or joint, except for splices in busbars or taps to the conductor in multiple enclosures.
How can bonding jumper(s) from grounding electrode(s) and grounding electrode conductors be connected?
They can be connected to an aluminum or copper busbar not less than 1/4" x 2" (6 mm x 50 mm).
What are the items required to be bonded together according to NEC Section 250.92(A)?
Service raceways, cable trays, cable bus framework, or service cable armor or sheath; All service equipment enclosures containing service conductors
What are the methods permitted to ensure continuity at service equipment as defined in NEC Section 250.92(B)?
Bonding equipment to the grounded service conductor; Connections utilizing threaded couplings or listed threaded hubs on enclosures if made up wrench-tight; Threadless couplings and connectors if made up wrench-tight; Other approved devices, such as bonding-type locknuts
What is the key to successfully clearing ground fault currents?
Electrical continuity
Where is the exception to the requirement of bonding service equipment found?
NEC Section 250.84(A)
Which conductor is responsible for providing a conductive path for ground fault current to travel from noncurrent-carrying metal parts to the system grounding conductor or grounding electrode conductor?
Equipment grounding conductor
What is the primary function of a grounded conductor in an electrical system?
To stabilize the voltage to ground during normal operation
Which type of conductor is known as the bonding conductor that electrically connects all exposed conductive items not designed to carry electricity to protect against electric shock?
Equipment grounding conductor
What is the purpose of the grounding electrode conductor in an electrical system?
To ground both the circuit grounded conductor and the equipment grounding conductor
What are the requirements for the material of the grounding electrode conductor?
Must be made of copper, aluminum, or copper-clad aluminum
When installing the grounding electrode conductor, what is a prohibited condition regarding splices or joints?
Must be in one continuous length without a splice or joint
What is the main purpose of a grounding electrode conductor in an electrical system?
To establish a direct electrical connection to earth
In an electrical system, what does it mean for a conductor to be 'grounded'?
Connected directly to ground (earth)
What distinguishes a grounded conductor from a grounding electrode conductor in electrical systems?
A grounded conductor carries current under normal conditions, while a grounding electrode conductor establishes a direct connection to earth.
Why is the neutral conductor in a three- or four-wire service intentionally grounded in an electrical system?
To improve the overall operation of the electrical system
Test your knowledge on grounding electrode conductors, including rod, pipe, or plate electrodes, local underground systems, and their connections. Learn about the importance of grounding electrode conductors in electrical systems.
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