Question 1 of 20
What is the minimum required working space depth in front of an electrical panelboard (up to 600V)?
NEC 110.26(A)(1) specifies a minimum working space depth of 36 inches (3 ft) for panelboards.
Question 2 of 20
What is the minimum required working space width in front of an electrical panelboard?
NEC 110.26(A)(1) specifies a minimum working space width of 30 inches.
Question 3 of 20
What is the minimum working space height required in front of an electrical panelboard?
NEC 110.26(A)(1) requires a minimum working space height of 6.5 feet.
Question 4 of 20
What is the maximum permitted depth of a wireway beyond the front of a panelboard?
The maximum permitted distance for the through (wireway) beyond the front of panelboard is 6 inches.
Question 5 of 20
Where are electrical panels generally NOT permitted to be installed?
Electrical panels are generally not permitted inside bathrooms or closets.
Question 6 of 20
What is the purpose of grounding and bonding in an electrical panel?
Proper grounding and bonding are crucial for safety and minimizing the risk of electric shock.
Question 7 of 20
Where should the neutral and ground be separated?
The neutral and ground must be separated at sub-panels but bonded using jumper wire at the main service panel.
Question 8 of 20
What is the purpose of a grounding electrode?
Grounding electrodes, such as ground rods, provide a connection to the earth, ensuring a safe path for fault currents.
Question 9 of 20
What is the primary function of circuit breakers?
Circuit breakers protect circuits from overcurrents.
Question 10 of 20
According to the NEC, how should circuit breakers be sized in relation to the load?
Circuit breakers must be sized appropriately to protect the circuit conductors.
Question 11 of 20
What is the minimum size of a main service panel?
The minimum size of main service is 100A, 120V, 3-wires.
Question 12 of 20
In what unit is the ampacity of a conductor measured?
Ampacity is the current-carrying capacity of a conductor, measured in amperes.
Question 13 of 20
Which NEC article covers grounding and bonding?
NEC Article 250 addresses grounding and bonding requirements.
Question 14 of 20
What type of protection does a GFCI provide?
GFCI stands for Ground Fault Circuit Interrupter.
Question 15 of 20
What does AFCI stand for?
AFCI stands for Arc Fault Circuit Interrupter.
Question 16 of 20
Where must equipment grounding conductors be attached in a panelboard, if nonmetallic-sheathed cable is used?
NEC 408.20 requires a terminal bar for attaching equipment grounding conductors when nonmetallic-sheathed cable is used.
Question 17 of 20
What is the maximum height above the floor for the top of a panelboard, as stated in the text?
Mounting height of panelboards should not higher than 6 ft 7in. (2 meters) above the floor.
Question 18 of 20
If a panelboard is mounted 18 inches above the floor and is 5 feet 6 inches tall, what is the total height of the top of the panelboard from the floor?
18 inches + 5 feet 6 inches = 7 feet.
Question 19 of 20
In the case where the top of the equipment exceeds 6.5 ft, the minimum workspace height shall be equal to?
When the top of the equipment exceeds 6.5 ft, the minimum workspace height shall be equal to the height of the equipment.
Question 20 of 20
Which of the following is NOT a requirement for panelboard installation?
Panelboards cannot be installed inside cabinets.
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