Lesson 8: General Requirements Related to Installing Wiring Devices
What is the minimum size equipment bonding jumper used to connect a grounding-type receptacle to a grounded metal box where the branch circuit supplying the receptacle circuit is protected by a 30-ampere overcurrent protective device?
10 AWG copper
What is the minimum size equipment grounding conductor required for a branch circuit protected by an overcurrent device rated at 40 amperes supplying a range receptacle rated at 50 amperes?
10 AWG copper
Branch-circuit conductors may be connected to the terminals of receptacle wiring devices by wrapping the conductor around the screw terminals of the device or by using "push-in" stabbing terminals on the device. What is the maximum size conductor permitted for devices where the "push-in" method is used?
14 AWG copper (solid)
How many volume allowances must be taken for each device installed in an outlet box?
2
What is the minimum cubic inch capacity required for 12 AWG copper conductors in an outlet box?
2.25 in^3
When a GFCI receptacle device is installed on a 20-ampere branch circuit (12 AWG copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?
2.25 in^3
Which of the following is an acceptable means of identification of the equipment grounding conductor terminal on a duplex receptacle?
A terminal identified by a green-colored finish, the words "green" or "ground," or the letters "G" or "GR," or a grounding symbol
If the branch-circuit wiring in conduit to a receptacle is installed in the building walls, the wiring is considered to be ? .
concealed
The conductor used to connect from the equipment grounding conductors in a device outlet box to a grounding terminal of a grounding-type receptacle is a(n) ? .
equipment bonding jumper
What is the maximum overcurrent protection rating for a circuit of 12 AWG THHN conductors (after any applicable correction factors) which originate from a circuit breaker in a panelboard and terminate directly on a 20-ampere receptacle? Note that the breaker and receptacle are not marked with temperature ratings.
20 amperes
Where an outlet box (having no cable clamps) contains a receptacle and four 12-2 NM cables, what is the minimum cubic inch capacity required for the box?
24.75 in^3
The maximum gap permitted between drywall and the edge of a device box or plaster ring shall not be greater than ? .
3 mm (1/8")
Where a device box is installed in a wall or ceiling that has a finish surface made of gypsum wallboard, what is the maximum distance that the face of the box or plaster ring is permitted to be set back from the finish?
6 mm (1/4")
Where branch-circuit conductors enter a standard single-gang device box, the minimum length of free conductor measured from the face of the box or plaster ring shall be not less than ? .
75 mm (3")
Which of the following is generally not considered an outlet by the NEC?
A device box with a 3-way switch
Where a multiwire branch circuit in a dwelling unit is connected to a duplex receptacle, using an ungrounded (hot) conductor to each of the receptacles on the device (split-wired) and a common neutral conductor connected to the receptacle, which of the following is required?
A means to disconnect simultaneously all ungrounded conductors must be provided where the circuit originates.
Where the NEC uses the word approved related to installations of conductors and equipment, it is defined as which of the following?
Acceptable to the authority having jurisdiction
Specific receptacle and switch box mounting heights are required by which of the following?
Americans with Disabilities Act Guidelines ADA
Which of the following best defines the circuit conductors between the final overcurrent protective device and the outlet(s)?
Branch circuit
When determining conductor fill (volume allowances) at device boxes, branch-circuit conductors that pass through a device box without a splice or termination are required to be counted in accordance with which of the following volume allowances?
Each conductor must be counted once
Where a device box is fastened to a framing member and the screw or nail passes through the box, which of the following is an acceptable location for the screw or nail used to fasten the box?
It is permitted, but must not be more than 6 mm (1/4") from the back or end of the enclosure
Where standard device boxes are used and all the conductors in the box are of the same size in AWG, which of the following NEC Tables is permitted to be used to determine the minimum size required for the box?
Table 3.14.16(A)
Boxes are generally required in branch-circuit wiring at which of the following locations? - conductor splice points - receptacle outlet and switch points -junction or pull points
all of the above
Which of the following are common elements and considerations to all wiring device installations?
all of the above
Terminals on receptacles intended for connection of grounded neutral conductors are required to be identified by which of the following methods? - A terminal that is metal or metal coated in a substantially white color - The letter "W" adjacent to the identified terminal - Where the terminal is not visible, the word "White" or "W" next to the hole for the grounded conductor or the entrance hole for the conductor shall be colored white.
any of the above
A device or utilization equipment wider than a single 50 mm (2 in.) device box as described in Table 314.16(A) shall have a ? volume allowance provided for each gang required for mounting the device.
double
Where the branch-circuit wiring is installed (fished) in existing hollow spaces of walls or ceilings, the device boxes are required to be secured to the ? .
finished surface
When conductors are pulled through a device box, what is the minimum length required for such conductors?
minimum length is not required
Boxes used for wiring devices such as switches and receptacles must provide ? support.
substantial
