Chapter 2 Flashcards
If the neutral conductor of different voltage systems are installed in the same raceway, cable, or enclosure how must you identify the different conductors?
One of the neutral conductors must have a readily distinguishable color stripe (other than green) along it’s entire lenght.
The terminal for the grounded (neutral) conductor must be colored ______ (______)
White, (silver)
Receptacles must have the terminal intended for connection to the grounded (neutral) conductor identified by:
1) A metal or metal coating that’s white or marked by the word white or the letter W
2) If the terminal isn’t visible, the conductor entrance hole must be marked with the word white or the letter “W”
Only the grounded circuit conductor is permitted to use the following, unless otherwise permitted in 200.7 (B) and (C)
1) Continuous white or gray covering
2) Three continuous white or gray stripes (other than green)
3) Marking of white or gray at the termination
What are the primary concerns covered in chapter 2?
Correctly sizing and protecting circuits
The continuity of the grounded (neutral) conductor isn’t permitted to be dependent on what?
Metal enclosure, raceways, or cable armor
(T/F) White or gray conductors can be used within a cable as an ungrounded conductor
True
Are conductors from a battery, uninterruptible power supply, solar PV systems, generators, or transformers considered service conductors?
No, they are feeder conductors
What are (4) ways in which a neutral conductor 4 AWG or larger can be identified?
1) White
2) Gray
3) Three continuous white or gray stripes
(4) White or gray tape at the terminations
(T/F) You can use white tape, paint, or other methods of identification for neutral conductors 6 AWG and smaller
False
To prevent electric shock, the screw shell of a luminaire or lampholder must be connected to the _______ conductor
Grounded (neutral)
A single neutral conductor can be used on how many branch circuits?
One
What happens to the neutral if the ungrounded conductors on a multi-wire branch circuit aren’t terminated to different phases?
The currents on the neutral won’t cancel which can result in an overload on the neutral conductor
Terminals for the circuit equipment grounding conductor must be ________
Green
Neutrals size 6 AWG must be identified by what (3) means?
1) White
2) Gray
3) three continuous white or gray stripes along its entire length other than green insulation.
(T/F) You are not allowed to use white or gray conductors within a flexible cord as an ungrounded conductor (connecting an appliance or other equipment)
False
Does the NEC permit the use of white or gran conductor insulation for ungrounded conductors within a raceway if the conductors are permanently reidentified?
No
The terminal for the ungrounded conductor must be a color readily distinguihable from ______ ( _____ or _____)
White (brass or copper)
A multi-wire branch circuit consists of how many ungrounded conductors?
Two or more
Multi-wire branch circuits have a common _____ condcutor
Neutral
(T/F) All conductors of a multi-wire branch circuit must originate from the same panelboard
True
Each multi-wire branch circuit must have a means to simultaneously disconnect all ungrounded conductors at the point where the branch circuit _____
Originates
Multi-wire branch circuits must supply only ____ to_____ loads
Line - neutral
The ungrounded and neutral conductors of a multi-wire branch circuit must be identified or _____ together with cable ties or similar means in every enclosure
Grouped
(T/F) Grouping isn’t required in multi-wire branch circuits if the circuit conductors are contained in the same raceway or if they pass through a conduit body without any splices or terminations
True
What happens if the conductors of a multi-wire branch circuit aren’t terminated to the correct phase?
It causes overload on the neutral because the currents don’t cancel
When a premises has more than one voltage system supplying branch circuits, the ungrounded conductors must be identified by _____ and _____
Phase ; System
The metal mounting structure for such items as receptacles, switches, switches with pilot lights, and switch-receptacles to name a few is called what?
Yoke , also called a strap
(Dwelling Units) GFCI protection is required for ____ and ___, 125V receptacles installed in the following locations: bathrooms, garages, outdoors
15A ; 20A
Each dwelling unit of a multi-family dwelling that has an individual entrance at grade level must have a least one GFCI protected receptacle outlet accessible from grade level located not more than ___ feet above grade
6.5
A receptacle supplying only a permanently installed fire alarm or burglar alarm system is required to be GFCI protected
False
GFCI protection is required for 15A and 20A, 125V receptacles located within ____ feet from the top inside edge of the bowl of the sing
6
The minimum number of general lighting and general use receptacle branch circuits must be determined by dividing the total calculated _____ in amperes by the _____ rating of the circuits used
Load, ampere
What is the limit to the number of receptacles permitted on a circuit in a dwelling unit?
None
At least _____ 20A, 120V small appliance receptacle branch circuits are required to supply receptacle outlets in a dwelling unit kitchen, dinning room, breakfast room, pantry, or similar dining areas as required by 210.52 (B)
Two
A 15A, 125V receptacle is rated for _____ feed-through,
20A
Lighting outlets or receptacles located in other areas of a dwelling unit are permitted to be connected to the small appliance branch circuit
False
At least one ____, 120V branch circuit is required to supply receptacle outlet(s) in the laundry area as required by 210.52
20A
(T/F) The branch circuit for the laundry room is permitted to serve other outlets such as the laundry room lighting or receptacles in other rooms
False
(T/F) The 20A laundry room receptacle circuit can supply more than one receptacle in the laundry room
True
(T/F) The 20A, 120V laundry branch circuit is required, even if the laundry appliance installed is a 30A, 230V combination washer/dryer
True
At least one ___, 120V branch circuit is required to supply the bathroom(s) receptacle outlet(s) as required by 210.52(D). This circuit (is/isn’t) permitted to serve any other outlet, such as bathroom lighting outlets or receptacles in other rooms
20A , Isn’t
Can a luminaire, ceiling fan, or bath fan be connected to the 20A, 120V branch circuit that supplies only one bathroom?
Yes
At least ____ 20A, 120V branch circuit(s) is required to supply the receptacle outlets in attached garages and detached garages with electric power
One
A listed combination _____ breaker is required for all 15A or 20A, 120V branch circuits in dwelling units supplying outlets or devices in kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms or areas
AFCI
The rating of a branch circuit is determined by what?
The branch circuit overcurrent protection device
To provide reasonable efficiency of operation of electrical equipment, branch circuit conductors should be sized to prevent a voltage drop not to exceed ____ percent. In addition, the maximum total voltage drop on both feeders and branch circuits shouldn’t exceed _____ percent
3 ; 5
(T/F) The NEC considers voltage drop to be a safety issue
False
Conductors must be sized no less than ____ percent of the continuous loads, plus ____ percent of the noncontinuous loads, based on the terminal temperature rating ampacities as listed in table 310.15(B)
125 ; 100
Branch circuits that supply more than one receptacle must have an ampacity not less than the rating of the what?
Circuit overcurrent protection device
Branch circuit conductors that supply household ranges, wall-mounted ovens, or counter-mounted cooking units must have an ampacity not less than the rating of the ____, and not less than the maximum ____ to be served
Branch circuit ; load
Branch-circuit overcurrent protection devices must have a rating of not less than ____ percent of the continuous load, plus _____ percent of the noncontinuous loads
125 ; 100
Lampholders connected to a branch circuit rated over ____ amps must be of the heavy duty type
20
(T/F) A single receptacle has only one contact device on its yoke, this means a duplex receptacle is considered to be two receptacles
True
(Multiple Receptacle Loading) If connected to a branch circuit that supplies two or more receptacles, the total cord-and-plug connected load must not exceed ____ percent of the receptacle rating
80
Equipment fastened in place isn’t permitted to be rated more than _____ percent of the branch circuit ampere rating that supplies luminaires, receptacles, or both
50
(T/F) Branch circuits installed for public or common areas of a multi-occupancy building are permitted to originate from equipment that supplies an individual dwelling unit or tenant space
False
Receptacle outlets installed in a dwelling unit for a specific appliance, such as a washing machine, dryer, range, garage door opener, or refrigerator, must be within ____ feet of the intended location of the appliance
6
A receptacle outlet must be installed so that no point along the floor line of any wall is more than ____ feet measured horizontally along the floor line, from a receptacle outlet
6
(Floor receptacle outlets aren’t counted as the required receptacle wall outlet if they’re located more than ___ inches from the wall
18
(T/F) The two or more 20A, 120V small appliance branch circuits serving the kitchen, pantry, breakfast room, and dining room area of a dwelling unit must serve all wall, floor, countertop, receptacle outlets and the receptacle outlets for refrigeration equipment
True
(T/F) The 20A, 120V small appliance circuits required by 210.11(C)(1) can supply outlets for luminaires or appliances
False
A receptacle outlet must be installed for each kitchen and dining area countertop wall space ___ ft or wider, and receptacle outlets must be placed so that no point along the countertop space or work surface wall space is more than ___ ft, measured horizontally, from a receptacle outlet
1 ; 2
At least one receptacle outlet must be installed at each island countertop space with a long dimension of _____ ft or more and a short dimension of ____ ft or more
2 ; 1
(T/F) The code doesn’t require more than one receptacle outlet in an island or peninsular countertop space, regardless of the length of the countertop, unless the countertop is broken as described in 210.52(C)(4)
True
Receptacle outlets required by 210.52(C)(1) must be located on or above, but not more than _____ inches above, the countertop or work surface
20
At least one 15A or 20A, 125V receptacle outlet must be installed within ____ ft from the outside edge of each bathroom basin
3
A 15A or 20A, 125V receptacle can be between two basins as long as what?
It’s located within 3 ft of the outside edge of both basins
How many GFCI protected 15A or 20A, 125V receptacle outlets that are readily accessible from grade must be installed outdoors for each dwelling unit and not more than 6 1/2 ft above grade?
Two, one in the front and one in the back
Each dwelling unit of a multifamily dwelling located at ground level that has individual exterior entrance/egress must have at least ______ GFCI protected 15A or 20A, 125V readily accessible receptacle outlet(s) located nor more than _____ ft above grade
One ; 6.5
