21 Questions
List three reasons to properly ground a system.(Rule: 10-002)
Improved human safely through lowered voltage-to-ground, improved overcurrent operation, reduced risk of fire.
Which of the following electrical points should be grounded on a DC 3 - wire system?
neutral voltage terminal
If the services was grounded at point A, what magnitude and polarity of shock could be felt between point A and ground?
0 volts
If the service was grounded at point B, what magnitude and polarity of shock could be felt between point B and ground?
0 volts
If the service was grounded at point C, what magnitude polarity of shock could be felt between point C and ground?
0
Which of the following electrical points should be grounded on an AC-3 wire system( Rule: 10-208)
neutral
What is the maximum voltage to ground allowed for a single phase residential application (Rule: 10-206, 10-208)
150 volts
A electrical system may be grounded at how many electrical points? (Rule: 10-204) & Rule: 10-208(d)
only one electrical point can be grounded
May a single electrical point of a system be grounded at more than one physical location? (Rule: 10-212)
Yes, if it is the same electrical point it may be grounded multiple times.
A system ground goes from the grounding electrode to the ....... inside the main service equipment
A equipment ground goes from the grounding electrode to the ............... inside the main service equipment.
What is the minimum number of grounded points that are necessary on a circuit before the overcurrent devices will operate? Rule: 10-212)
Two
A well casing is a form of which of the following: Rule: 10-102(4)
In-situ grounding electrode
Ground rods are a form of which of the following: (Rule: 10-102)
manufactured grounding electrode, field assembled grounding electrode, in-situ grounding electrode.
Where there are multiple grounding electrodes at a building, they shall be: ( Rule: 10-104)
2 m from each other
Which of the following are allowed to be used to bond equipment downstream of the service
EMT, Rigid steel conduit, Aluminum sheath, copper conductors, Aluminum conductors
a bonding conductor is run in the same raceway with other conductors and what is its maximum length? (Rule: 10-612(3)
15 m
How deep must the ground plate be buried ? (Rule: 10-102(2)(c)(i)
In direct contact with exterior soil at not less than 600 mm below grade level.
How many and how far apart must the ground rods? (Rule: 10-102(2)(a)(i)
consist of two rod electrodes and spaced not less than 3 m apart
What materials and gauge must the grounding conductors be? (Rule: 10-114(1)(a)(b)
No. 6 AWG copper , No. 4 AWG aluminum
If the plate electrode were to be encased in a concrete footing, what minimum depth below grade would the plate electrode need to be? Rule: 10-102(2)(c)(ii)
encased within the bottom 50 mm of a concrete foundation footing in direct contact with the earth at not less than 600 mm below finished grade.
Test your knowledge of grounding systems with this quiz. Learn about the reasons for proper grounding, the electrical points to be grounded on DC and AC 3-wire systems, and understand the potential shock magnitudes and polarities between different grounding points and ground.
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