Lab chapter 3
If the above circuits supply receptacle outlets, the branch-circuit overcurrent device must be sized at not over 15, 20, or 25 amperes.
15 amps
What is the minimum number of 15-ampere lighting branch circuits required if the dwelling unit has an occupied area of 4000ft^2? Show all calculations.
4000ft^2x3=12000 volt-amps/120volts=100/15amps=7 circuits
According to NEC 210.50(C), a laundry equipment outlet must be placed within ____ ft (m) of intended location of the laundry equipment
6ft
What are some GFCI exemptions for receptacle outlets installed in unfinished basements?
fire alarms and burglar alarms
NEC 210.8(A)(3) requires all receptacles installed outdoors to have GFCI protection. Explain the exception and describe the conditions for the exception.
ice melting equipment that is not readily accessible
How is the load determined for outlets supplying specific appliances? NEC 220.14(A)
it is determined by the ampere rating of the appliance (found on the name plate)
How is the total load in volt-amperes determined? NEC 220.12
multiply the floor area by 3 volt-amps
The code requires that at least one 20-ampere circuit feeding a receptacle outlet must be provided for the laundry. May this circuit supply other outlets?
no
Is a receptacle required in a hallway in a home when the hallway is 8 ft long?
no (must be 10ft+)
What is the meaning of calculated load?
what you calculated out in volt-amps
Is a receptacle required in a bedroom on a 3 ft wall space behind a door? The door is usually left open.
yes wall space is 2ft or more 210.52(A)
How many lighting branch circuits are provided in this dwelling?
13
How many receptacle outlets are required on a 13ft wall space between 2 doors? NEC 210.52(H)
(it takes 1)
What is the smallest size wire that can be used in a branch circuit rated at 20 amps.
12 AWG
The NEC in Article 100 defines a continuous load as, "A load where the maximum current is expected to continue for 3 hours or more." According to 210.19(A) and 210.20(A), the branch-circuit conductors and over-current protection for a continuous load shall be sized not less than (100%)(125%)(150%) of the continuous load.
125%
What is the minimum load allowance for small appliance circuits for dwellings? NEC 220.52(A)
1500 volt-amperes for each small appliance branch circuit
The minimum number of outdoor receptacles for a residence is ______, NEC ______. State the location.
2 210.52(E)(1) One in front and one in back no more than 18 inches above grade
What type of circuits must be provided for receptacle outlets in kitchen, pantry, dinning room, and breakfast room? NEC 210.11(C)(1)
2 or more 20 amp small appliance branch circuits
If connected to a fixed nonmotor, noncontinuous load, the branch-circuit overcurrent device may be sized at 15, 20, or 25 amperes.
20 amps
NEC ______ of the Code prohibets connecting lighting and/or fire/smoke/security systems to an individual tenant's electrical source where common (shared) areas are present, in which the case the lighting provided for both tenants is connected on one tenant's electrical source.
210.25
A 25-ampere branch circuit conductor is derated to 70%. It is important to provide proper overcurrent protection for these conductors. The derated conductor ampacity is _______.
25 x 0.7 = 17.5 amps
In a basement, at least one receptacle outlet must be installed in addition to the receptacle outlet installed for the laundry equipment. This additional receptacle outlet and any other receptacle outlets in unfinished areas must be ________ protected.
Ground Fault Circuit Interrupter
How is the rating of a branch circuit protective device affected when the conductors used are of the larger size than the one called for by the code? See NEC 210.3
It is not effected
In the past, it was common practice to connect the lighting and receptacle (s) in a bathroom to the same circuit. Because of overloads caused by high-wattage grooming appliances, the Code requires that these receptacle(s) be supplied by a separate 20-amp branch circuit. Where is this code requirement found?
NEC 210.11(C)3
When installing weatherproof outdoor receptacles high up under the eaves of a house intended to be used for plugging in deicing and snow melting cable for the rain gutters, must these receptacles be GFCI protected for personal protection?
No
Define a branch circuit.
The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).
A sliding glass door is installed in a family room that leads to an outdoor deck. The sliding door has one 4ft sliding section and one 4ft permanently mounted glass section. For inside the recreation room, what does the Code say about wall receptacle outlets relative to the receptacle's position near the sliding glass door?
The fixed portion is counted
If a residence has two bathrooms the Code states _____.
The receptacles in both bathrooms are permitted to be served by the same 20-ampere branch circuit
A split-level home has one stairway that has six risers between two levels of the home. What must be done for the switched light over the steps?
Two three-way switches must be installed (one switch at that top of the stairs, one switch at the bottom of the stairs) to control the lighting for the stairway.
A balcony on the second floor of a new residence measures 4ft x 10ft. The balcony is accessed by a sliding door.Is a receptacle outlet required for this balcony?
Yes 210.52(E)3
An individual 20-amp branch circuit supplies a receptacle for a refrigerator. The receptacle shall be permitted to be _______.
a single receptacle this is because its not easily accessible
The Code indicates that the rooms in a dwelling that are required to have a switched lighting outlets or switched receptacles. Write "yes" (switch required) or "no" (switch not required) for the following areas NEC 210.70(A) a.) attic (where used for storage b.) stairway c.) crawlspace (where used for storage) d.) hallway e.) bathroom f.) clothes closet
a.) attic (where used for storage) yes b.) stairway yes (two are required at the top and bottom of stairwells having 6 or more risers) c.) crawlspace (where used for storage) yes d.) hallway yes e.) bathroom yes f.) clothes closet no
Small appliance receptacle outlets are (included) or (not included) in the 3-volt-ampere-per-foot calculations.
are not
If the homeowner wishes to have a switched receptacle outlet for a swag lamp in a dining room, may this switched receptacle outlet be considered to be one of the receptacle outlets required for the 20-amp small-appliance circuits?
no unless half of the receptacle is hot all the time
What spaces are not included in the floor area when calculating the load in voltamperes per square foot? See NEC 220.12
open porches, crawl spaces, or unused or unfinished spaces not adaptable for future use
What dimensions are used when measuring the area of a building? See NEC 220.12
outside dimensions with certain areas being taken out of the calculation
What is the unit load per square foot for dwelling units? See table 220.12
3 volt-amperes/ft^2
How is the required number of branch circuits determined?
3 volt-amps per square foot
How is the minimum number of receptacle outlets for most occupied rooms? NEC 210.52(A)
at no point on a wall line can you be 6 feet away from an outlet
In a single family dwelling, how is over-current protection for branch circuits required to be provided? NEC 210.20
breakers or fuses (fuses are actually safer but less convenient)
Although the code contains many exceptions to the basic over-current protection requirements for conductors, in general, the rating of the branch circuit overcurrent device must (not be less than) (not be more than) the ampacity of the conductor
cannot be more than the ampacity of the conductor
No point along a wall line shall be more than 6 feet from a receptacle outlet. This requirement (does apply)(does not apply) to unfinished residential basements
does not apply
How are branch circuits rated? NEC 210.3
rated based on overcurrent protection device
When determining the location and number of receptacles required, fixed room dividers and railings (shall be)(need not be) considered to be wall space.
shall be
An individual 15 amp branch circuit is run to the receptacle outlet behind the refrigerator instead of connecting it to one of the two 20-ampere small-appliance branch circuits that are required in kitchens. For this separate circuit, an additional 1500 volt-amperes (shall)(does not have to) be added to the load calculations for dwellings
shall not
How is the total lighting load in amperes determined?
taking your volt-amps divided by volts
The rating of a branch circuit is based on what?
the rating of the overcurrent device
